SBD FIRE WEATHER AND INFO 9/20/17

DAILY FIRE WEATHER & FIRE INFO            

To:     ALL UNITS From: EMAIL: pdupree@bdcecs.org
Ph: OFFICE:(760) 559-3032  RADIO:(HAM) KG6ZHW

COUNTY F.D RADIO: #733784 COM-330  

Date: 9/20/17
SKYWARN: NORMAL

NETS ON WED  NIGHT @1900 HEAPS PK./WX BRIEFS TABLE  MT. ON SUN @ 1800 HRS

DAYS NO R.F. @ STA.: 09

 

National Preparedness Level 4 

Southern California Area

Preparedness Level: (PL 3) 

Northern California Area

Preparedness Level (PL 3) SYNOP:

***Very windy in and near the desert today***

***Much warmer and drier conditions with light offshore winds next week***

A deep trough fixed over the northern Rockies has resulted in cool weather across the West the past few days. A secondary front moving through the trough will produce gusty west winds and strong onshore flow today and Thursday. Early this morning, west winds of 20-30 mph with gusts to 45 mph are blowing across the Antelope Valley. Expect similar wind speeds by afternoon across the Kern County Mountains, Banning Pass and the eastern Cleveland National Forest. It will remain windy in these areas through Thursday evening; afterward, winds decrease across the entire district. Temperatures today and Thursday will be 10-15 degrees below normal with highs in the 60s at the coast to the 70s in the valleys. Some patchy drizzle can be expected near the higher terrain this morning. Thursday, some lift associated with the front may lead to light rain across the Sierra front country as well as the south aspects of the mountains of Southern California. All precipitation amounts will be under a quarter of an inch.

The trough will move eastward Friday and high pressure over the Pacific will approach the area over the weekend. A light offshore pressure gradient will cause marine layer clouds to depart and the lower atmosphere to dry significantly Sunday and Monday. By early next week, afternoon temperatures will reach the upper 80s to lower 90s across the valleys and lower foothills of Southern California. Minimum RH will likely drop into the 10-15% range over many areas from Kern County Southward. At this time, all offshore winds are expected to remain below 20 mph. Expect sunny, warm and dry weather to continue through most of next week.

  FLASH FLOOD POTENTIAL INDEX FOR EXTREME SOUTHWESTERN CALIFORNIA

No thunderstorms are expected this week.

                                                     WED       THU

Inland Empire NONE NONE
San Bernardino County Mountains NONE NONE
High Desert Including Apple and Lucerne Valleys NONE NONE
San Gorgonio Pass Near Banning NONE NONE

Flash Flood Codes: GREEN: NONE   YELLOW: LOW   ORANGE: MODERATE  RED: HIGH NWS LAS VEGAS SYNOP– (NORTH & EAST OF COUNTY)

A cold low pressure system dropping out of the Pacific Northwest will increase southwest today followed by stronger southwest winds Thursday across the Mojave Desert region and southern Great Basin. A cold front will sweep across the area late Thursday bringing light snow chances above 7000 feet in the southern Great Basin. Critical fire weather conditions are not expected due to relatively high fuel moisture and marginal  humidities.

 

SPECIAL NOTES: N/A

 

DAILY FUELS/FIRE POTENTIAL:

Windy weather in and near the desert will allow for very rapid rates of spread in any new start today and Thursday in these areas. However, cool temperatures and humid conditions in the wind prone areas should keep ignition components low. Fine fuel moisture is slightly above normal over most areas due to the humid weather of the past few weeks. Both live and dead fuel moisture has not changed much since the beginning of the month, but much of Southern California still has below normal dead fuel moisture readings. Next week, strong drying conditions should allow for much more receptivity to ignition during the afternoon hours. Fuel moisture readings will likely resume their downward course and there may be some IA returning to the foothills and urban interfaces of Southern California by next Monday. Until then, expect little, if any, IA or resource demand

 

SANTA ANA WILDFIRE THREAT INDEX: TODAY: GREY-NO RATING

 

————————————————————————————–APPLE VALLEY / HESPERIA-VICTOR VALLEY (CAZ260):

.WEDNESDAY…

Sky/weather………Sunny.

Max temperature…..81 to 89.

24 HR TREND……Up 1 degree.

Min humidity……..15 to 20 percent.

24 HR TREND……Little change.

WIND (20 FT)……..Winds west 9 to 19 mph. Gusts to 25

mph…becoming 35 mph in the afternoon.

LAL……………..1.

.WEDNESDAY NIGHT…

Sky/weather………Mostly clear.

Min temperature…..52 to 61.

24 HR TREND……Little change.

Max humidity……..65 to 75 percent.

24 HR TREND……Up 15 percent.

WIND (20 FT)……..Winds southwest 10 to 18 mph with gusts to 35

mph.

LAL……………..1.

.THURSDAY…

Sky/weather………Mostly sunny…becoming partly cloudy.

Max temperature…..71 to 81.

24 HR TREND……Down 11 degrees.

Min humidity……..25 to 30 percent.

24 HR TREND……Up 10 percent.

WIND (20 FT)……..Winds west 10 to 20 mph with gusts to 40 mph.

LAL……………..1.

 WRIGHTWOOD:

Today

Sunny, with a high near 69. West wind 5 to 10 mph becoming north in the afternoon.

Tonight

Clear, with a low around 50. Southwest wind 5 to 10 mph increasing to 10 to 15 mph after midnight. Winds could gust as high as 20 mph.

Thursday

A 20 percent chance of showers after 11am. Sunny, with a high near 57. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

Thursday Night

A 20 percent chance of showers before 11pm. Mostly clear, with a low around 38. West wind 5 to 10 mph.

 PHELAN:

Today

Sunny, with a high near 75. Light west wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

Tonight

Mostly clear, with a low around 50. South wind 10 to 15 mph, with gusts as high as 20 mph.

Thursday

Mostly sunny, with a high near 67. South wind 5 to 15 mph, with gusts as high as 25 mph.

Thursday Night

Mostly clear, with a low around 44. West wind 5 to 15 mph, with gusts as high as 25 mph

 TRONA:

Today

Sunny, with a high near 95. Light south wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 21 mph.

Tonight

Mostly clear, with a low around 63. Breezy, with a southwest wind 18 to 23 mph, with gusts as high as 32 mph.

Thursday

Sunny, with a high near 83. Breezy, with a southwest wind 24 to 28 mph, with gusts as high as 39 mph.

Thursday Night

Mostly clear, with a low around 54. West wind 15 to 20 mph becoming light after midnight. Winds could gust as high as 28 mph.

 

BARSTOW / DAGGETT / BAKER / FT. IRWIN (CAZ228):

.WEDNESDAY…  * Sky/Weather………Sunny.  * Max temperature:  *     Valley floor….92-97.  *     24 hr trend…..Little change.  * Min humidity:  *     Valley floor….11-16 percent.  *     24 hr trend…..Little change.  * Wind (Slope/valley=20 ft, 10 min avg):  *     Valley floor….Southwest wind up to 10 mph with gusts to around        25 mph increasing to 10 to 15 mph with gusts to around 40 mph        in the afternoon.  *     10000 ft msl….West 15 to 25 mph.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..5.  .WEDNESDAY NIGHT…  * Sky/Weather………Mostly clear.  * Min temperature:  *     Valley floor….56-61.  *     24 hr trend…..On average up 2 degrees.  * Max humidity:  *     Valley floor….43-48 percent.  *     24 hr trend…..On average up 3 percent.  * Wind (Slope/valley=20 ft, 10 min avg):  *     Valley floor….Southwest wind 10 to 20 mph.  *     10000 ft msl….West 20 to 30 mph increasing to southwest 30 to        40 mph after midnight.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..5.  .THURSDAY…  * Sky/Weather………Sunny.  * Max temperature:  *     Valley floor….89-94.  *     24 hr trend…..On average down 3 degrees.  * Min humidity:  *     Valley floor….13-19 percent.  *     24 hr trend…..On average up 2 percent.  * Wind (Slope/valley=20 ft, 10 min avg):  *     Valley floor….Southwest wind 15 to 25 mph with gusts to around        45 mph.  *     10000 ft msl….Southwest 30 to 40 mph increasing to 35 to 45 mph        in the afternoon.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..4.

 

SOUTHERN OWENS VALLEY / EAST SIERRA FOOTHILLS:

WEDNESDAY…  * Sky/Weather………Mostly sunny.  * Max temperature:  *     Valley floor….85-90.  *     7000 feet…….73-78.  *     24 hr trend…..Little change.  * Min humidity:  *     Valley floor….12-15 percent.  *     7000 feet…….19-29 percent.  *     24 hr trend…..On average up 2 percent.  * Wind (slope/valley=20 ft, 10 min avg):  *     Slope/valley….North winds up to 10 mph shifting to the south in        the afternoon. Gusts up to 35 mph.  *     Upper slopes….West winds 10 to 15 mph. Gusts up to 35 mph in        the afternoon.  *     10000 ft msl….West 10 to 15 mph.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..5.  .WEDNESDAY NIGHT…  * Sky/Weather………Partly cloudy. Scattered rain showers after    midnight.  * Min temperature:  *     Valley floor….52-57.  *     7000 feet…….25-30.  *     24 hr trend…..On average down 6 degrees.  * Max humidity:  *     Valley floor….48-53 percent.  *     7000 feet…….67-72 percent.  *     24 hr trend…..On average up 3 percent.  * Wind (slope/valley=20 ft, 10 min avg):  *     Slope/valley….West winds 10 to 15 mph decreasing to around 10        mph after midnight.  *     Upper slopes….West winds 15 to 25 mph.  *     10000 ft msl….West 15 to 25 mph increasing to 20 to 30 mph        after midnight.  * CWR (>= 0.10 in)….20 percent.  * LAL……………..1.  * Haines Index……..5.  .THURSDAY…  * Sky/Weather………Partly cloudy with scattered snow showers and    isolated showers.  * Max temperature:  *     Valley floor….76-81.  *     7000 feet…….61-66.  *     24 hr trend…..On average down 7 degrees.  * Min humidity:  *     Valley floor….14-17 percent.  *     7000 feet…….26-36 percent.  *     24 hr trend…..On average up 5 percent.  * Wind (slope/valley=20 ft, 10 min avg):  *     Slope/valley….West winds 10 to 15 mph with gusts to around 35        mph.  *     Upper slopes….West winds 15 to 25 mph with gusts to around 40        mph.  *     10000 ft msl….West 15 to 25 mph becoming north up to 10 mph in        the afternoon.  * CWR (>= 0.10 in)….10 percent.  * LAL……………..1.  * Haines Index……..3.

 

INLAND EMPIRE (CAZ248):

.WEDNESDAY…

Sky/weather………Cloudy…becoming sunny. Patchy fog in the

morning.

Max temperature…..75 to 81.

24 HR TREND……Up 1 degree.

Min humidity……..40 to 50 percent.

24 HR TREND……Down 5 percent.

WIND (20 FT)……..Variable 3 to 6 mph becoming southwest 6 to 11

mph with gusts to 20 mph in the afternoon.

LAL……………..1.

.WEDNESDAY NIGHT…

Sky/weather………Mostly clear…becoming cloudy.

Min temperature…..52 to 62.

24 HR TREND……Up 1 degree.

Max humidity……..85 to 95 percent.

24 HR TREND……Down 10 percent.

WIND (20 FT)……..Winds west 6 to 11 mph with gusts to 20 mph

becoming south around 6 mph after midnight.

LAL……………..1.

.THURSDAY…

Sky/weather………Cloudy. Slight chance of showers.

Max temperature…..Around 63.

24 HR TREND……Down 10 degrees.

Min humidity……..50 to 60 percent.

24 HR TREND……Up 15 percent.

WIND (20 FT)……..Winds southwest 6 to 12 mph with gusts to 25

mph.

LAL……………..1.

 

DEVORE:

Today

Cloudy through mid morning, then gradual clearing, with a high near 76. South wind 5 to 10 mph.

Tonight

Increasing clouds, with a low around 56. South wind 5 to 15 mph, with gusts as high as 20 mph.

Thursday

A 30 percent chance of showers, mainly after 11am. Mostly cloudy, with a high near 68. Southwest wind 5 to 10 mph.

Thursday Night

A 20 percent chance of showers before 11pm. Mostly cloudy, with a low around 50. Southwest wind 5 to 10 mph becoming light and variable. Winds could gust as high as 20 mph.

 

CHINO HILLS:

Today

Mostly cloudy, then gradually becoming sunny, with a high near 78. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

Tonight

Increasing clouds, with a low around 60. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

Thursday

A 30 percent chance of showers. Mostly cloudy, with a high near 72. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

Thursday Night

A 20 percent chance of showers before 11pm. Mostly cloudy, with a low around 56. Southwest wind 10 to 15 mph becoming light and variable after midnight. Winds could gust as high as 25 mph

 

COLTON:

Today

Cloudy through mid morning, then gradual clearing, with a high near 81. Calm wind becoming west around 5 mph in the afternoon.

Tonight

Increasing clouds, with a low around 62. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

Thursday

A 30 percent chance of showers, mainly after 11am. Mostly cloudy, with a high near 73. South wind around 5 mph becoming calm.

Thursday Night

A 20 percent chance of showers before 11pm. Mostly cloudy, with a low around 58. West wind 5 to 10 mph becoming southeast in the evening.

 

SAN BERNARDINO N.F. (CAZ255/CAZ256):

WEDNESDAY…

Sky/weather………Partly cloudy…becoming sunny.

Max temperature…..64 to 74 above 6000 feet to 68 to 78 below 6000

feet.

24 HR TREND……Up 1 degree.

Min humidity……..20 to 25 percent on desert slopes to 30 to 40

percent on coastal slopes.

24 HR TREND……Up 10 percent.

WIND (20 FT)……..

SLOPES………..Winds west 6 to 16 mph. Gusts to 30 mph.

RIDGETOP………Winds west 6 to 10 mph with gusts to 20 mph.

LAL……………..1.

.WEDNESDAY NIGHT…

Sky/weather………Mostly clear.

Min temperature…..38 to 48 above 6000 feet to 44 to 54 below 6000

feet.

24 HR TREND……Down 2 degrees.

Max humidity……..40 to 50 percent on desert slopes to 80 to 90

percent on coastal slopes.

24 HR TREND……Up 20 percent.

WIND (20 FT)……..

SLOPES………..Winds west 6 to 16 mph becoming south after

midnight. Gusts to 30 mph.

RIDGETOP………Winds west 9 to 19 mph with gusts to 35 mph.

LAL……………..1.

.THURSDAY…

Sky/weather………Partly cloudy.

Max temperature…..52 to 62 above 6000 feet to 61 to 71 below 6000

feet.

24 HR TREND……Down 12 degrees.

Min humidity……..20 to 30 percent on desert slopes to 45 to 55

percent on coastal slopes.

24 HR TREND……Up 20 percent.

WIND (20 FT)……..

SLOPES………..Winds west 11 to 21 mph with gusts to 40 mph.

RIDGETOP………Winds west 14 to 24 mph with gusts to 45 mph.

LAL……………..1.

 

BANNING PASS:

WEDNESDAY…

Sky/weather………Sunny.

Max temperature…..91 to 96.

24 HR TREND……Little change.

Min humidity……..15 to 20 percent.

24 HR TREND……Little change.

WIND (20 FT)……..Winds west 11 to 21 mph. Gusts to 30

mph…becoming 40 mph in the afternoon.

LAL……………..1.

.WEDNESDAY NIGHT…

Sky/weather………Clear. Areas of blowing sand and blowing dust

in the evening. Areas of blowing dust after

midnight.

Min temperature…..63 to 71.

24 HR TREND……Down 1 degree.

Max humidity……..40 to 50 percent.

24 HR TREND……Down 10 percent.

WIND (20 FT)……..Winds west 12 to 22 mph with gusts to 40 mph.

LAL……………..1.

.THURSDAY…

Sky/weather………Mostly sunny. Areas of blowing sand and blowing

dust.

Max temperature…..87 to 92.

24 HR TREND……Down 7 degrees.

Min humidity……..20 to 25 percent.

24 HR TREND……Up 5 percent.

WIND (20 FT)……..Winds west 15 to 25 mph with gusts to 50 mph.

LAL……………..1.

 

JOSHUA TREE AREA (CAZ261):

.WEDNESDAY…  * Sky/weather…………………Sunny.  * Max Temperature……………..79-94.  *    24 hr trend………………Little change.  * Min Humidity………………..16-25 pct.  *    24 hr trend………………Little RH change.  * Winds – 20 foot…Slope/Valley..Southwest 5 to 15 mph.  * Winds…10000 FT MSL…………Southwest 15 to 25 mph.  * Chance of Precip…………….0 percent.  * CWR (>= 0.10 IN)…………….0 percent.  * LAL………………………..1.  * Haines High Level Index………4 or low potential for large    plume dominated fire growth.  .WEDNESDAY NIGHT…  * Sky/weather…………………Clear.  * Min Temperature……………..56-64.  *   24 hr trend………………Little change.  * Max Humidity………………..44-55 pct.  *    24 hr trend………………3 pct wetter.  * Winds – 20 foot…Slope/Valley..West 5 to 15 mph.  * Winds…10000 FT MSL…………Southwest 15 to 25 mph.  * Chance of Precip…………….0 percent.  * CWR (>= 0.10 IN)…………….0 percent.  * LAL………………………..1.  .THURSDAY…  * Sky/weather…………………Sunny.  * Max Temperature……………..72-88.  *    24 hr trend………………7 degrees cooler.  * Min Humidity………………..20-32 pct.  *    24 hr trend………………6 pct wetter.  * Winds – 20 foot…Slope/Valley..West 10 to 20 mph.  * Winds…10000 FT MSL…………Southwest 25 to 35 mph.  * Chance of Precip…………….0 percent.  * CWR (>= 0.10 IN)…………….0 percent.  * LAL………………………..1.  * Haines High Level Index………4 or low potential for large    plume dominated fire growth.
NEEDLES, RIVER BAT. (CAZ229):

.WEDNESDAY…  * Sky/Weather………Sunny.  * Max temperature:  *     Valley floor….94-99.  *     24 hr trend…..Little change.  * Min humidity:  *     Valley floor….10-15 percent.  *     24 hr trend…..Little change.  * Wind (Slope/valley=20 ft, 10 min avg):  *     Valley floor….South wind 10 to 15 mph with gusts to around 35        mph.  *     10000 ft msl….Southwest 15 to 20 mph becoming 15 to 25 mph in        the afternoon.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..5.  * Mixing height…….7400 ft agl.  * Transport winds…..South 10 to 15 knots increasing to around 20    knots in the afternoon.  * Ventilation………Excellent.  .WEDNESDAY NIGHT…  * Sky/Weather………Mostly clear.  * Min temperature:  *     Valley floor….66-71.  *     24 hr trend…..Little change.  * Max humidity:  *     Valley floor….38-43 percent.  *     24 hr trend…..On average up 5 percent.  * Wind (Slope/valley=20 ft, 10 min avg):  *     Valley floor….South wind 10 to 15 mph.  *     10000 ft msl….Southwest 20 to 30 mph increasing to 30 to 40 mph        after midnight.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..5.  .THURSDAY…  * Sky/Weather………Sunny.  * Max temperature:  *     Valley floor….92-97.  *     24 hr trend…..On average down 2 degrees.  * Min humidity:  *     Valley floor….13-18 percent.  *     24 hr trend…..On average up 3 percent.  * Wind (Slope/valley=20 ft, 10 min avg):  *     Valley floor….South wind 10 to 20 mph with gusts to around 40        mph.  *     10000 ft msl….Southwest 35 to 45 mph.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..4.  * Mixing height…….10700 ft agl.  * Transport winds…..South 15 to 20 knots.  * Ventilation………Excellent.

 

LAS VEGAS CLARK COUNTY BORDER:

WEDNESDAY…  * Sky/Weather………Sunny.  * Max temperature:  *     4000 feet…….87-92.  *     24 hr trend…..Little change.  * Min humidity:  *     4000 feet…….12-15 percent.  *     24 hr trend…..On average down 2 percent.  * Wind (slope/valley=20 ft, 10 min avg):  *     Slope/valley….South winds up to 10 mph increasing to 10 to 15      mph in the afternoon. Gusts up to 35 mph.  *     10000 ft msl….Southwest 10 to 15 mph increasing to 15 to 25 mph        in the afternoon.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..5.  * Mixing height…….7600 ft agl.  * Transport winds…..Light winds becoming south 10 to 15 knots in    the afternoon.  * Ventilation………Excellent.  .WEDNESDAY NIGHT…  * Sky/Weather………Mostly clear.  * Min temperature:  *     4000 feet…….58-63.  *     24 hr trend…..Little change.  * Max humidity:  *     4000 feet…….40-45 percent.  *     24 hr trend…..On average up 3 percent.  * Wind (slope/valley=20 ft, 10 min avg):  *     Slope/valley….Southwest winds 10 to 15 mph.  *     10000 ft msl….Southwest 20 to 30 mph increasing to 30 to 40 mph        after midnight.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..5.  .THURSDAY…  * Sky/Weather………Partly cloudy with isolated showers in the afternoon.  * Max temperature:  *     4000 feet…….84-89.  *     24 hr trend…..On average down 3 degrees.  * Min humidity:  *     4000 feet…….14-19 percent.  *     24 hr trend…..On average up 3 percent.  * Wind (slope/valley=20 ft, 10 min avg):  *     Slope/valley….Windy. Southwest winds 15 to 20 mph increasing to        20 to 30 mph in the afternoon. Gusts up to 50 mph.  *     10000 ft msl….Southwest 35 to 45 mph.  * CWR (>= 0.10 in)….0 percent.  * LAL……………..1.  * Haines Index……..3.  * Mixing height…….8800 ft agl.  * Transport winds…..Southwest 20 to 25 knots.  * Ventilation………Excellent.

 

*************************** OUT OF COUNTY *************************************

LOS ANGELS CO. SAN GABRIEL VALLEY (CAZ247/CAZ249):                                                   ANDLOS ANGELES COUNTY SAN FERNANDO VALLEY:.WEDNESDAY…  Sky/weather………Mostly cloudy then becoming mostly sunny.  Max temperature…..74-83.     24 hr trend……Little change.  Min humidity……..35-50 percent.     24 hr trend……Down 5.  20-foot winds…….Variable 3-6 mph becoming southeast to southwest                      8-15 mph with local gusts to 20 mph.  Marine layer……..3700 ft asl.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .WEDNESDAY NIGHT…  Sky/weather………Mostly clear then becoming cloudy.  Min temperature…..55-65.  Max humidity……..70-90 percent.  20-foot winds…….Southeast to southwest 8-15 mph with local gusts                      to 20 mph in the evening becoming variable 3-6 mph.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .THURSDAY…  Sky/weather………Cloudy then becoming partly cloudy.                      Slight chance of showers.  Max temperature…..68-78.  Min humidity……..40-60 percent.  20-foot winds…….Variable 3-6 mph becoming southeast to southwest                      8-15 mph with local gusts to 20 mph.  LAL……………..1.  CWR (>0.10 IN)……10 percent. SANTA MONICA MOUNTAINS RECREATIONAL AREA:.WEDNESDAY…  Sky/weather………Cloudy then becoming partly cloudy.  Max temperature…..74-82 except 68-74 coastal slopes and higher peaks.     24 hr trend……Little change.  Min humidity……..40-60 percent.     24 hr trend……Down 5.  20-foot winds…….      Valleys/lwr slopes…Variable/upslope 4-8 mph becoming upvalley 8-15 mph                           with local gusts to 25 mph in the afternoon.      Ridges/upr slopes….Variable 3-6 mph becoming southwest to west 8-15 mph                           in the afternoon.  Marine layer……..3700 ft asl.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .WEDNESDAY NIGHT…  Sky/weather………Partly cloudy then becoming cloudy.  Min temperature…..52-62.  Max humidity……..75-95 percent.  20-foot winds…….      Valleys/lwr slopes…Upvalley 8-15 mph with local gusts to 25 mph in                           the evening becoming downslope/downvalley 3-6 mph.      Ridges/upr slopes….Southwest to west 8-15 mph in the evening becoming                           variable 3-6 mph.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .THURSDAY…  Sky/weather………Cloudy then becoming partly cloudy. Slight                      chance of showers in the morning.  Max temperature…..70-78 except 65-70 coastal slopes and higher peaks.  Min humidity……..35-50 percent except 50-60 percent coastal slopes                      and higher peaks.  20-foot winds…….      Valleys/lwr slopes…Variable/upslope 4-8 mph becoming upvalley 8-15 mph                           with local gusts to 25 mph in the afternoon.      Ridges/upr slopes….Variable 3-6 mph becoming southwest to west 8-15 mph                           in the afternoon.  LAL……………..1.  CWR (>0.10 IN)……10 percent. SANTA CLARITA VALLEY:WEDNESDAY…  Sky/weather………Mostly sunny.  Max temperature…..76-84.     24 hr trend……Little change.  Min humidity……..35-50 percent.     24 hr trend……Down 5.  20-foot winds…….Variable 3-6 mph becoming south to southwest 8-15 mph                      with gusts to 25 mph in the afternoon.  Marine layer……..3700 ft asl.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .WEDNESDAY NIGHT…  Sky/weather………Mostly clear then becoming mostly cloudy.  Min temperature…..52-57.  Max humidity……..80-100 percent.  20-foot winds…….South to southwest 8-15 mph with gusts to 25 mph in                      the evening becoming variable 3-6 mph.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .THURSDAY…  Sky/weather………Mostly cloudy then becoming partly cloudy.  Max temperature…..68-74.  Min humidity……..40-55 percent.  20-foot winds…….Variable 3-6 mph becoming south to southwest 8-15 mph                      with gusts to 25 mph in the afternoon.  LAL……………..1.  CWR (>0.10 IN)……0 percent. ANGELES NATIONAL FOREST (CAZ253):WEDNESDAY…  Sky/weather………Mostly sunny.  Max temperature…..66-75 except 75-82 lower interior slopes.     24 hr trend……Little change.  Min humidity……..40-55 percent except 20-30 percent higher peaks                      and warmer valleys.     24 hr trend……Little change.  20-foot winds…….      Valleys/lwr slopes…Northwest to north 5-10 mph becoming upvalley                           8-15 mph with gusts to 25 mph in the afternoon.      Ridges/upr slopes….Northwest to north 10-20 mph with local gusts to                           30 mph. Strongest through the Interstate 5                           corridor.  Marine layer……..3700 ft asl.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .WEDNESDAY NIGHT…  Sky/weather………Mostly clear except for areas of low clouds and                      fog on the coastal slopes after midnight.  Min temperature…..52-58 low elevations to 45-52 colder valleys                      and peaks.  Max humidity……..50-70 percent except 80-100 percent colder valleys.  20-foot winds…….      Valleys/lwr slopes…Upvalley 8-15 mph with local gusts to 25 mph                           in the evening becoming northwest to north                           5-15 mph.      Ridges/upr slopes….Northwest 15-25 mph with local gusts to 35 mph.                           Strongest through the Interstate 5 corridor.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .THURSDAY…  Sky/weather………Partly cloudy except for areas of morning low clouds                      and fog on the coastal slopes. Slight chance of showers.  Max temperature…..58-72 low elevations to 49-58 higher elevations.  Min humidity……..50-70 percent except 30-45 percent higher peaks                    and warmer valleys.  20-foot winds…….      Valleys/lwr slopes…Northwest to north 5-10 mph becoming upvalley                           8-15 mph with gusts to 25 mph in the afternoon.      Ridges/upr slopes….Northwest to north 10-20 mph with local gusts to                           30 mph. Strongest through the Interstate 5                           corridor.  LAL……………..1.  CWR (>0.10 IN)……0 percent. ANTELOPE VALLEY (CAZ259):WEDNESDAY…  Sky/weather………Mostly sunny.  Max temperature…..75-85.     24 hr trend……Little change.  Min humidity……..20-30 percent.     24 hr trend……Little change.  20-foot winds…….West 10-20 mph increasing to 15-25 mph with gusts to                      35 mph. Isolated gusts to 45 mph near Lake Palmdale.  Marine layer……..None.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .WEDNESDAY NIGHT…  Sky/weather………Mostly clear.  Min temperature…..51-59.  Max humidity……..60-75 percent.  20-foot winds…….West 15-25 mph with gusts to 35 mph decreasing to                      10-20 mph after midnight. Isolated gusts to 45 mph                      near Lake Palmdale.  LAL……………..1.  CWR (>0.10 IN)……0 percent.  .THURSDAY…  Sky/weather………Mostly sunny.  Max temperature…..65-75.  Min humidity……..25-35 percent.  20-foot winds…….West 10-20 mph increasing to 15-25 mph with gusts to                      35 mph. Isolated gusts to 45 mph near Lake Palmdale.  LAL……………..1.  CWR (>0.10 IN)……0 percent. KERN CO. DESERTS (CAZ298):.WEDNESDAY…  Sky/weather………Sunny.  MAX TEMPERATURE…..78-83.     24 HR TREND……Little change.  MIN HUMIDITY……..16-26 percent.     24 HR TREND……Down 3-5 percent.  20-FOOT WINDS…….West 10-20 mph. Gusts to around 35 mph.  LAL……………..1.  VENTILATION………Excellent.  Mixing height…….6800 ft AGL.  TRANSPORT WINDS…..West around 10 mph in the morning increasing to                      around 20 mph in the afternoon.  CHC WETTING RAIN….0 percent.  .WEDNESDAY NIGHT…  Sky/weather………Mostly clear.  MIN TEMPERATURE…..53-58.     24 HR TREND……Little change.  MAX HUMIDITY……..65-75 percent.     24 HR TREND……Up 7-17 percent.  20-FOOT WINDS…….West 10-20 mph. Gusts to around 35 mph.  LAL……………..1.  CHC WETTING RAIN….0 percent.  .THURSDAY…  Sky/weather………Mostly sunny.  MAX TEMPERATURE…..67-72.     24 HR TREND……Down 6-16 degrees.  MIN HUMIDITY……..28-38 percent.     24 HR TREND……Up 5-11 percent.  20-FOOT WINDS…….Southwest to west 15-25 mph. Gusts around 40 mph.  LAL……………..1.  VENTILATION………Excellent.  Mixing height…….9000 ft AGL.  TRANSPORT WINDS…..West 20 to 25 mph.  CHC WETTING RAIN….0 percent. TEHACHAPI:WEDNESDAY…  Sky/weather………Sunny.  Max temperature…..     5000 FEET……..67-72.     24 HR TREND……Little change.  MIN HUMIDITY……..     5000 FEET……..23-33 percent.     24 HR TREND……Down 3-5 percent.  WIND – 20 FOOT (10 MINUTE AVERAGE)     SLOPES………..Westerly 7-17 mph.     RIDGES………..Northwest 10-20 mph.  LAL……………..1.  VENTILATION………Very good.  Mixing height…….5800 ft AGL.  TRANSPORT WINDS…..West around 10 mph in the morning increasing to                      around 20 mph in the afternoon.  CHC WETTING RAIN….0 percent.  .WEDNESDAY NIGHT…  Sky/weather………Mostly cloudy. Slight chance of showers after                     midnight.  Min temperature….     5000 FEET……..44-49.     24 HR TREND……Little change.  MAX HUMIDITY……..     5000 FEET……..74-84 percent.     24 HR TREND……Up 11-23 percent.  WIND – 20 FOOT (10 MINUTE AVERAGE)     SLOPES………..Westerly 10-20 mph. Gusts around 30 mph.     RIDGES………..Northwest 11-22 mph.  LAL……………..1.  CHC WETTING RAIN….0 percent.  .THURSDAY…  Sky/weather………Partly sunny. Slight chance of showers in the                      morning.  Max temperature…..     5000 FEET……..57-62.     24 HR TREND……Down 7-13 degrees.  MIN HUMIDITY……..     5000 FEET……..30-40 percent.     24 HR TREND……Up 5-11 percent.  WIND – 20 FOOT (10 MINUTE AVERAGE)     SLOPES………..Westerly 10-20 mph. Gusts around 30 mph.     RIDGES………..West 10-20 mph.  LAL……………..1.  VENTILATION………Excellent.  Mixing height…….6900 ft AGL.  TRANSPORT WINDS…..Northwest 15 to 20 mph.  CHC WETTING RAIN….0 percent. ORANGE CO. (ANAHEIM):WEDNESDAY…Cloudy in the morning…becoming mostly sunny. Highs  75 to 80. Light winds.  .WEDNESDAY NIGHT…Partly cloudy in the evening…becoming  cloudy. Lows 57 to 65. Light winds.  .THURSDAY…Cloudy in the morning…becoming partly cloudy.  Slight chance of showers. Highs 70 to 75. Light winds becoming  south 15 mph with gusts to 25 mph in the afternoon. Chance of  measurable precipitation 20 percent.  .THURSDAY NIGHT…Partly cloudy. Slight chance of showers in the  evening. Lows 52 to 62. Light winds. Chance of measurable  precipitation 20 percent. SAN DIEGO COAST (SAN DIEGO):WEDNESDAY…Cloudy in the morning…becoming mostly sunny. Highs  71 to 76. Light winds.  .WEDNESDAY NIGHT…Partly cloudy in the evening…becoming  cloudy. Lows 60 to 65. Light winds.  .THURSDAY…Cloudy in the morning…becoming partly cloudy.  Slight chance of showers. Highs around 71. Light winds. Chance of  measurable precipitation 20 percent.  .THURSDAY NIGHT…Partly cloudy with a slight chance of showers  in the evening, then mostly cloudy overnight. Lows 58 to 64.  Light winds. Chance of measurable precipitation 20 percent.====================================================================THIS DAY IN WEATHER HISTORY:

2010: Summer ended as the coolest since 1933 in the coastal and valley areas, and the 11th coolest overall at San Diego. A persistent west coast trough and efficient coastal ocean upwelling were the causes. Low maximum temperature records for at least one station were reached on 54 of the 92 days of summer. A few days later, the highest temperatures of the year occurred, especially on 9/27.

 

2005: Numerous thunderstorms hit the region, especially northern San Diego County. Lightning was the big problem, knocking out power, starting a number of tree fires from Carlsbad to Escondido.

 

1984: Highest minimum temperature records were set each day in San Diego for 18 consecutive days, starting on 9/3 and ending on this day.

1983: Northward moving Hurricane Manuel dissipated off the west coast of northern Baja California with up to three inches of rainfall in the southern mountains and deserts on this day and on 9/21. This occurred during the strong El Niño of 1982-83.

 

1965: It was 26° in Idyllwild, the lowest temperature on record for September. This also occurred on 9/21/1968, 9/23/1945, and 9/24/1945.

 

1952: Hurricane Five tracked up the Baja California coast, sending a surge of moisture into Southern California. Showers and storms impacted the region from the coast to the deserts over a three-day period centered on this day. Palm Springs reported 1.46 inches of rain, while Redlands received 1.33 inches. This occurred during the El Niño of 1951-52.

 

1939: A heat wave that started on 9/18 and ended on 9/22 preceded the arrival of a tropical storm called “El Cordonazo.” High temperature records of more than 95° occurred at San Diego each day, with the highest temperature reaching 106° on 9/21. On this day it was 107° in Escondido and 104° in the San Diego – College area. Eight heat-related deaths resulted in LA. A tropical cyclone moving northwestward, just off the west coast of Mexico, moved into southern Baja California and dissipated. The moisture from this tropical cyclone generated rainfall of up to three inches in the deserts and mountains starting on 9/19 and ending on 9/21. =========================================================================TROPICAL EAST PACIFIC REPORT:

Tropical Weather Outlook

 

For the eastern North Pacific…east of 140 degrees west longitude:

 

A broad area of low pressure located near the coast of Mexico a

couple of hundred miles east-southeast of Acapulco is producing

disorganized showers and thunderstorms. Land interaction should

limit development of this system during the next day or two, but

a tropical depression will likely form by the weekend when the

system moves farther offshore. Regardless of tropical cyclone

formation, heavy rains are expected over portions of southern Mexico

during the next several days.

* Formation chance through 48 hours…low…30 percent.

* Formation chance through 5 days…high…80 percent.

 

 

==============================================================================

CURRENT WEATHER @ HESP. @0710hrs TEMP:540 RH:92% WIND: CALM8.17” RF @ HESP. STA.SINCE JUL 1st/20 Yr Avg: 7.12”  : MONTH:0.04”   YTD S/F: 0.00” /

————————————————————————————–

FIRES: UPDATED

National Preparedness Level 4

Initial attack activity: Light (65) new fires
New large incidents: 4
Large fires contained: 4
Uncontained large fires:** 25
Area Command Teams Committed: 1
NIMOs committed: 3
Type 1 IMTs committed: 6
Type 2 IMTs committed: 22

 

Two hundred and forty-five soldiers from the 23rd Brigade Engineer Battalion and 1-23 Infantry Battalion based out of Fort Lewis, Washington are deployed in support of the Umpqua North Complex.

 

 

Active Incident Resource Summary
GACC Fires Cumulative Acres Crews Engines Helicopters Total Personnel
AICC 0 0 0 0 0 0
NWCC 26 765,299 157 251 48 6,588
ONCC 11 226,424 99 153 35 3,897
OSCC 8 62,533 20 34 5 868
NRCC 39 726,710 48 178 24 3,109
GBCC 11 165,209 4 24 4 323
SWCC 5 1,621 5 10 0 174
RMCC 8 18,079 2 19 2 173
EACC 0 0 0 0 0 0
SACC 4 2,260 0 3 0 13
Total 112 1,968,135 335 672 118 15,145

 

 

Northern California Area (PL 3)

New fires: 14
New large incidents: 1
Uncontained large fires: 4
Type 2 IMTs committed: 5

 

Date Time News and Notes
09/18/2017 1845 CA-KNF-006098 Complex, 100,065 acres timber, 45% contained. Scattered rain and higher relative humidity significantly decreased fire behavior. Burning snags still pose a threat to containment lines Crews continue to improve fire line in areas with potential threats. Suppression repair is ongoing where the threat to containment lines is minimal to nonexistent and on contingency lines that are no longer needed.

 

09/18/2017 1845 CA-SHU Berry Fire 744 acres 25% contained. Crews continue to reinforce control lines and continue firing indirect lines and unburned pockets.

 

09/18/2017 1845 CA-SHF Buck Fire: 3,000 acres, 15% contained. The fire continues to actively burn in heavy dead and down timber and remote locations. Crews continue to use road systems to hold the fire from spreading north of the wilderness.

 

09/18/2017 1845 CA-SHF Helena fire, 21,911 acres grass, brush, and timber 58% contained. The fire continues to slowly spread where the tree canopy sheltered ground fuels from precipitation.

 

09/18/2017 1845 CA-KNF Salmon August Complex, 65,893 acres timber, 50% contained. No growth on the incident due to precipitation over the fire. No structure threats at this time. The Wallow Fire is 65,232 and 50% contained. The Deep Fire is 210 acres and 50% contained. Crews are working on suppression repair and fire line improvement where needed.

 

 

Southern California Area (PL 3)

New fires: 13
New large incidents: 1
Uncontained large fires: 1

 

 

SOUTH OPS INFO:

Federal Incidents

 

Pier, Vegetation Fire, Tulare County, Update Highway 190, east of Springville Federal DPA, FRA, Sequoia NF

  • 36,556 acres grass and brush, 95% contained
  • Minimal fire behavior
  • Demobilizing excess resources
  • Burning in tree mortality area

 

Creek, Vegetation Fire, Tuolumne County, Update 6 Miles South East of Cold Springs Federal DPA, FRA, Stanislaus NF

  • 856 acres brush and timber, 5% contained

Minimal fire behavor

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