WEATHER 2/20/20

DAILY FIRE WEATHER & FIRE INFO
ALL UNITS From:
EMAIL: pdupree@bdcecs.org
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Date: 2/20/20

SKYWARN: NORMAL
NETS ON WED NIGHT @1900 HEAPS PK./WX
SKYWARN NET TUESDAY @ 1900 HRS TABLE Mt.
BRIEFS TABLE MT. ON SUN @ 1800 HRS

DAYS NO R.F. @ STA.: 55

National Preparedness Level (PL 1 )

Southern California Area Preparedness Level: (PL 1 )

Northern California Area Preparedness Level (PL 1 )

GREEN = PL: 1 BLUE – PL:2 YELLOW = PL:3 ORANGE = PL:4 RED = PL: 5
==============================================================================
SOUTH OPS WX:
A ridge of high pressure centered over the Desert Southwest will strengthen a little through Friday as an area of low pressure spins off the California Coast. The area of low pressure will move inland over Southern California Saturday. A stronger ridge of high pressure than our current ridge will build inland into California from the Pacific Ocean Sunday through the middle of next week.

ꞏ Local northeast to east winds of 10 to 20 mph with gusts to 35 mph will surface across the mountains and below the canyons and passes of Southern California through Friday morning.

ꞏ Maximum temperatures will be around 10 degrees above normal through Friday, with 50s to low 60s across the mountains and upper 60s and 70s in the valleys.

ꞏ Minimum humidity will remain mainly between 15% and 30% through Friday.

ꞏ Temperatures will cool to around 10 degrees below normal Saturday.

ꞏ Scattered showers and isolated thunderstorms will move across the region early Saturday morning through Saturday evening.

ꞏ Rainfall amounts will be quite variable but expect most foothill and mountain locations to receive between a quarter inch and a half inch of rainfall and most coastal and valley locations to receive less than a quarter inch of rainfall.

ꞏ Some locations over the Southern Sierra and Southern Mountains may receive up to an inch of rainfall.

ꞏ The snow level will be between 5,000 and 6,000 feet.

ꞏ Westerly winds of 20 to 30 mph with gusts to 50 mph will surface across the mountain ridges and desert passes Saturday afternoon through Saturday night.

ꞏ A significant warming and drying trend will take place Sunday through the middle of next week.

ꞏ Temperatures will be 10 to 15 degrees above normal by the middle of next week, with widespread 80s in the valleys of Southern California.

ꞏ There will be local northeast to east winds of 10 to 20 mph with gusts to 35 mph across the mountains and below the canyons and passes of Southern California Monday morning through the middle of next week.

SYNOP: (NWS SAN DIEGO)
Weak offshore flow will prevail through Friday, with gusty east winds to 30 mph along the coastal slopes of the mountains. Thursday will be the warmest day west of the mountains, along with lower inland humidity.
A storm system will move into the region late Friday night through Saturday night, bringing clouds, lower humidity, precipitation, and a chance of thunderstorms Saturday morning. Dry weather will follow next
week with gusty offshore winds possible mid next week.

KEY POINTS

• A period of showers is expected after midnight Friday night through Saturday afternoon.
________________________________________
CHANGES SINCE LAST BRIEFING

• Slight increase in rainfall and snowfall amounts
________________________________________

CONFIDENCE AND DETAILS
Rainfall
Moderate
Confidence Periods of showers with light to moderate amounts, but leading to rain-slicked roadways
• What: Showers

Forecast Amounts:
Coast: 0.10-0.20”, isolated slightly higher amounts possible
Valleys: 0.20-0.40”, isolated slightly higher amounts possible
Mountains: 0.30-0.70”, favoring the coastal mountain slopes
Deserts: 0.05-0.15”

Hourly rate forecast: Mostly 0.10-0.20”/hr, but isolated up to 0.30”/hr, so flash flooding is not expected

• Where: All areas, but most widespread across the inland valleys and along the coastal mountain slopes
• When: After midnight Friday night through Saturday afternoon

Snowfall
Moderate
Confidence Periods of light to moderate snow showers, leading to snow-covered roads in the mountains
• What: Light to moderate snowfall

Forecast Amounts:
5500-6500 feet: Trace-1”
6500-7500 feet: 1-3”
7500+ feet: 3-6”

• Where: Mountains above 5500 feet
• When: After midnight Friday night through Saturday afternoon

SUMMARY
Dry weather will prevail through Friday. However, there is increasing confidence on a round of showers impacting Southern California late Friday night through Saturday afternoon. The showers will be most widespread across the inland valleys and along the coastal mountain slopes. The main impacts will be wet and slippery roads in the lowlands and snow-covered roads in the mountains.

NWS LAS VEGAS SYNOP– (NORTH & EAST OF COUNTY)
Another couple days of low RH values in the afternoon are expected, especially in the desert valleys before
widespread wetting rain arrives Saturday. Rain amounts will range from a quarter of an inch in central Nevada and the Owens Valley to over an inch in Mohave County by Sunday morning. A return to a dry forecast is expected Sunday through next week.

DAILY FUELS/FIRE POTENTIAL:
There will be little or no fire activity across the region through the forecast period

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

————————————————————————————–
APPLE VALLEY / HESPERIA-VICTOR VALLEY (CAZ260):
.TODAY… Sky/weather………Sunny.
Max temperature…..64 to 69. 24 HR TREND……Down 1 degree.
Min humidity……..15 percent. 24 HR TREND……Little change.
WIND (20 FT)……..Winds east 6 to 11 mph with gusts to 20 mph.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.TONIGHT… Sky/weather………Clear.
Min temperature…..36 to 44. 24 HR TREND……Up 2 degrees.
Max humidity……..35 to 45 percent. 24 HR TREND……Little change.
WIND (20 FT)……..Winds east 6 to 10 mph. Gusts to 20 mph in the evening.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.FRIDAY… Sky/weather………Sunny.
Max temperature…..67 to 72. 24 HR TREND……Up 4 degrees.
Min humidity……..15 to 20 percent. 24 HR TREND……Up 5 percent.
WIND (20 FT)……..Winds southeast 6 to 12 mph with gusts to 25 mph.
CWR (>0.10 IN)……0 percent. LAL……………..1.

*WRIGHTWOOD:
Thursday
Sunny, with a high near 56. East wind around 5 mph.
Thursday Night
Mostly clear, with a low around 39. South wind 5 to 10 mph.
Friday
Sunny, with a high near 57. Southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
A slight chance of rain showers before 10pm, then snow showers likely. Increasing clouds, with a low around 33. Breezy, with a south wind 15 to 25 mph decreasing to 5 to 15 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

*BIG PINES / WEST WRIGHTWOOD AREA
Thursday
Sunny, with a high near 55. East northeast wind 5 to 10 mph becoming south southeast in the morning.
Thursday Night
Mostly clear, with a low around 41. South wind around 5 mph.
Friday
Mostly sunny, with a high near 55. South wind 5 to 10 mph, with gusts as high as 15 mph.
Friday Night
Snow showers likely after 10pm. Mostly cloudy, with a low around 37. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

*PHELAN:
Thursday
Sunny, with a high near 64. Northwest wind around 5 mph becoming east in the afternoon.
Thursday Night
Mostly clear, with a low around 43. South wind around 5 mph.
Friday
Sunny, with a high near 65. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Friday Night
Showers likely, mainly after 10pm. Increasing clouds, with a low around 41. South wind 10 to 15 mph becoming light and variable after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

TRONA (INDIAN WELLS) (CAZ298):
.THURSDAY… Sky/weather………Sunny.
Max Temperature…..62-67. 24 HR Trend……Down 1-3 degrees.
Min Humidity……..11-19 percent. 24 HR Trend……Down 1-3 percent.
20-Foot Winds…….East 3-9 mph.
LAL……………..1.
Ventilation………Good. Mixing height…….4800 ft AGL. Transport Winds…..Northeast around 10 mph.
Chc Wetting Rain….0 percent.

.THURSDAY NIGHT… Sky/weather………Clear.
Min Temperature…..38-43. 24 HR Trend……Up 1-3 degrees.
Max Humidity……..35-45 percent. 24 HR Trend……Down 3-5 percent.
20-Foot Winds…….North 3-6 mph.
LAL……………..1. Chc Wetting Rain….0 percent.

.FRIDAY… Sky/weather………Partly cloudy. Slight chance of rain in the afternoon.
Max Temperature…..65-70. 24 HR Trend……Up 2-4 degrees.
Min Humidity……..13-21 percent. 24 HR Trend……Up 1-3 percent.
20-Foot Winds…….North 3-7 mph in the early morning shifting to the east 4-8 mph by afternoon.
LAL……………..1.
Ventilation………Good. Mixing height…….4300 ft AGL. Transport Winds…..Northeast around 10 mph.
Chc Wetting Rain….0 percent.

BARSTOW / DAGGETT / BAKER / FT. IRWIN (CAZ228):
.TODAY… * Sky/Weather………Sunny.
* Max temperature: * Valley floor….71-76. * 24 hr trend…..Little change.
* Min humidity: * Valley floor….10-13 percent. * 24 hr trend…..Little change.
* Wind (Slope/valley=20 ft, 10 min avg):
* Valley floor….Northeast wind 10 to 15 mph with gusts to around 25 mph.
* 10000 ft msl….South 10 to 15 mph shifting to the southwest 10 to 20 mph in the afternoon.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..3.

.TONIGHT… * Sky/Weather………Mostly clear.
* Min temperature: * Valley floor….39-44. * 24 hr trend…..On average up 3 degrees.
* Max humidity: * Valley floor….30-35 percent. * 24 hr trend…..Little change.
* Wind (Slope/valley=20 ft, 10 min avg):
* Valley floor….Northeast wind 10 to 15 mph.
* 10000 ft msl….South 10 to 15 mph becoming 10 to 20 mph after midnight.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..4.

.FRIDAY… * Sky/Weather………Mostly sunny.
* Max temperature: * Valley floor….72-77. * 24 hr trend…..Little change.
* Min humidity: * Valley floor….12-18 percent. * 24 hr trend…..On average up 3 percent.
* Wind (Slope/valley=20 ft, 10 min avg):
* Valley floor….East wind 10 to 15 mph.
* 10000 ft msl….South 15 to 25 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..2.

*BAKER:
Thursday
Sunny, with a high near 73. North northwest wind around 8 mph.
Thursday Night
Mostly clear, with a low around 40. North northeast wind 5 to 7 mph.
Friday
Sunny, with a high near 76. Light and variable wind becoming east southeast 5 to 8 mph in the morning.
Friday Night
Rain, mainly after 4am. Low around 45. East wind around 7 mph becoming south after midnight. Chance of precipitation is 80%.

SOUTHERN OWENS VALLEY / EAST SIERRA FOOTHILLS (CAZ226):
TODAY… * Sky/Weather………Sunny.
* Max temperature: * Valley floor….62-67.
* 7000 feet…….48-53. * 24 hr trend…..Little change.
* Min humidity:
* Valley floor….11-16 percent.
* 7000 feet…….24-34 percent.
* 24 hr trend…..On average up 2 percent.
* Wind (slope/valley=20 ft, 10 min avg):
* Slope/valley….Northeast winds up to 10 mph shifting to the south around 10 mph in the afternoon.
* Upper slopes….South winds 10 to 15 mph.
* 10000 ft msl….South 10 to 15 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..2.

.TONIGHT… * Sky/Weather………Mostly clear.
* Min temperature: * Valley floor….31-36. * 7000 feet…….12-17. * 24 hr trend…..On average up 8 degrees.
* Max humidity: * Valley floor….42-47 percent. * 7000 feet…45-50 percent. * 24 hr trend…On average down 4 percent.
* Wind (slope/valley=20 ft, 10 min avg):
* Slope/valley….South winds up to 10 mph shifting to the northwest after midnight.
* Upper slopes….Southwest winds 10 to 15 mph.
* 10000 ft msl….South 10 to 15 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..2.

.FRIDAY… * Sky/Weather………Mostly sunny.
* Max temperature: * Valley floor….65-70. * 7000 feet…….50-55. * 24 hr trend…..On average up 2 degrees.
* Min humidity: * Valley floor….12-18 percent. * 7000 feet…….24-34 percent. * 24 hr trend…..Little change.
* Wind (slope/valley=20 ft, 10 min avg):
* Slope/valley….North winds up to 10 mph shifting to the east around 10 mph in the afternoon. Gusts up to 25 mph.
* Upper slopes….Southeast winds 10 to 15 mph.
* 10000 ft msl….Southeast 10 to 15 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..3.

KERN CO. DESERTS (CAZ299):
.THURSDAY… Sky/weather………Sunny.
Max Temperature…..63-68. 24 HR Trend……Little change.
Min Humidity……..13-23 percent. 24 HR Trend……Down 3-5 percent.
20-Foot Winds…….East 3-10 mph.
LAL……………..1.
Ventilation………Good. Mixing height…….5700 ft AGL. Transport Winds…..East 10 to 15 mph.
Chc Wetting Rain….0 percent.

.THURSDAY NIGHT… Sky/weather………Clear.
Min Temperature…..38-43. 24 HR Trend……Up 1-3 degrees.
Max Humidity……..39-49 percent. 24 HR Trend……Down 2-8 percent.
20-Foot Winds…….Northeast 3-8 mph.
LAL……………..1. Chc Wetting Rain….0 percent.

.FRIDAY… Sky/weather………Partly cloudy. Slight chance of rain in the afternoon.
Max Temperature…..66-71. 24 HR Trend……Up 2-4 degrees.
Min Humidity……..18-28 percent. 24 HR Trend……Up 3-5 percent.
20-Foot Winds…….Northeast 3-10 mph in the early morning shifting to the east 6-11 mph by afternoon.
LAL……………..1.
Ventilation………Excellent. Mixing height…….8600 ft AGL. Transport Winds…..East around 15 mph.
Chc Wetting Rain….0 percent.

INLAND EMPIRE (CAZ248):
.TODAY… Sky/weather………Sunny.
Max temperature…..72 to 79. 24 HR TREND……Up 4 degrees.
Min humidity……..15 percent. 24 HR TREND……Down 20 percent.
WIND (20 FT)……..Winds east 6 to 10 mph becoming south 6 to 9 mph in the afternoon. Gusts to 20 mph.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.TONIGHT… Sky/weather………Clear.
Min temperature…..43 to 53. 24 HR TREND……Up 2 degrees.
Max humidity……..40 to 50 percent. 24 HR TREND……Down 55 percent.
WIND (20 FT)……..Winds east 6 to 10 mph with gusts to 20 mph.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.FRIDAY… Sky/weather………Mostly sunny.
Max temperature…..71 to 78. 24 HR TREND……Down 2 degrees.
Min humidity……..15 to 20 percent. 24 HR TREND……Up 5 percent.
WIND (20 FT)……..Winds south 6 to 10 mph with gusts to 20 mph.
CWR (>0.10 IN)……0 percent. LAL……………..1.

*DEVORE:
Thursday
Sunny, with a high near 75. North wind 10 to 15 mph becoming light and variable in the afternoon. Winds could gust as high as 25 mph.
Thursday Night
Mostly clear, with a low around 53. Light north wind increasing to 5 to 10 mph after midnight.
Friday
Sunny, with a high near 74. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Showers likely, mainly after 10pm. Increasing clouds, with a low around 47. West wind around 5 mph becoming southeast after midnight. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

*CHINO HILLS:
Thursday
Sunny, with a high near 75. East wind 5 to 10 mph becoming southwest in the afternoon.
Thursday Night
Mostly clear, with a low around 48. West wind around 5 mph becoming east after midnight.
Friday
Sunny, with a high near 72. East wind 5 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Showers likely after 10pm. Increasing clouds, with a low around 46. Southwest wind 5 to 10 mph becoming light south after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

*COLTON:
Thursday
Sunny, with a high near 78. Calm wind becoming southwest around 5 mph.
Thursday Night
Mostly clear, with a low around 49. South wind around 5 mph becoming calm.
Friday
Sunny, with a high near 77. East wind 5 to 10 mph becoming south in the afternoon.
Friday Night
Showers likely, mainly after 10pm. Increasing clouds, with a low around 47. South wind around 5 mph becoming west in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

SAN BERNARDINO N.F. (CAZ255):
TODAY… Sky/weather………Sunny.
Max temperature…..47 to 57 above 6000 feet to 66 below 6000 feet. 24 HR TREND……Up 2 degrees.
Min humidity……..15 to 20 percent. 24 HR TREND……Little change.
WIND (20 FT)……..
SLOPES………..Winds southeast 6 to 10 mph with gusts to 20 mph.
RIDGETOP………Winds south 6 to 9 mph. Gusts to 20 mph in the afternoon.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.TONIGHT… Sky/weather………Clear.
Min temperature…..27 to 37 above 6000 feet to 37 to 47 below 6000 feet. 24 HR TREND……Up 2 degrees.
Max humidity…25 to 35 percent on desert slopes to 30 to 40 percent on coastal slopes. 24 HR TREND…Down 10 percent.
WIND (20 FT)……..
SLOPES………..Winds east 6 to 9 mph with gusts to 20 mph.
RIDGETOP………Winds south 6 to 11 mph with gusts to 25 mph.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.FRIDAY… Sky/weather………Mostly sunny.
Max temperature…..49 to 59 above 6000 feet to 57 to 67 below 6000 feet. 24 HR TREND……Up 1 degree.
Min humidity……..20 to 25 percent. 24 HR TREND……Up 5 percent.
WIND (20 FT)……..
SLOPES………..Winds south 6 to 11 mph with gusts to 25 mph.
RIDGETOP………Winds south 7 to 11 mph with gusts to 25 mph.
CWR (>0.10 IN)……0 percent. LAL……………..1.

*LAKE ARROWHEAD SCHOOL- AREA:
Thursday
Sunny, with a high near 58. Southeast wind 5 to 10 mph becoming southwest in the morning.
Thursday Night
Mostly clear, with a low around 41. Southeast wind around 5 mph.
Friday
Sunny, with a high near 59. South wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
Rain showers likely before 4am, then rain and snow showers likely. Increasing clouds, with a low around 34. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

*BIG BEAR SCHOOL AREA:
Thursday
Sunny, with a high near 54. Southeast wind 5 to 10 mph becoming southwest in the afternoon.
Thursday Night
Mostly clear, with a low around 27. South wind 5 to 10 mph.
Friday
Sunny, with a high near 57. South wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
A slight chance of rain showers before 10pm, then snow showers likely. Increasing clouds, with a low around 25. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

BANNING PASS (CAZ265):
TODAY… Sky/weather………Sunny.
Max temperature…..75 to 80. 24 HR TREND……Down 2 degrees.
Min humidity……..10 to 15 percent. 24 HR TREND……Little change.
WIND (20 FT)……..Winds northeast 6 to 8 mph becoming southeast around 6 mph in the afternoon.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.TONIGHT… Sky/weather………Mostly clear.
Min temperature…..49 to 56. 24 HR TREND……Little change.
Max humidity……..25 to 35 percent. 24 HR TREND……Little change.
WIND (20 FT)……..Variable 2 to 4 mph becoming west around 6 mph after midnight.
CWR (>0.10 IN)……0 percent. LAL……………..1.

.FRIDAY… Sky/weather………Mostly sunny.
Max temperature…..74 to 79. 24 HR TREND……Up 1 degree.
Min humidity……..15 to 20 percent. 24 HR TREND……Up 5 percent.
WIND (20 FT)……..Variable 2 to 5 mph becoming southeast around 6 mph in the afternoon.
CWR (>0.10 IN)……0 percent. LAL……………..1.

JOSHUA TREE AREA (CAZ230):
.TODAY… * Sky/weather…………………Sunny.
* Max Temperature……………..62-73. * 24 hr trend………………Little change.
* Min Humidity………………..12-17 pct. * 24 hr trend………………3 pct drier.
* Winds – 20 foot…Slope/Valley..East 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………3 very low potential for large plume dominated fire growth.

.TONIGHT… * Sky/weather…………………Mostly clear.
* Min Temperature……………..42-50. * 24 hr trend………………Little change.
* Max Humidity………………..27-33 pct. * 24 hr trend………………3 pct drier.
* Winds – 20 foot…Slope/Valley..East 5 to 10 mph in the evening becoming north after midnight.
* Winds…10000 FT MSL…………South 10 to 20 mph.
* Chance of Precip…………….0 percent. * CWR (>= 0.10 IN)…………….0 percent. * LAL………………………..1.

.FRIDAY… * Sky/weather…………………Mostly sunny.
* Max Temperature……………..63-75. * 24 hr trend………………Little change.
* Min Humidity………………..19-24 pct. * 24 hr trend………………6 pct wetter.
* Winds – 20 foot…Slope/Valley..Northeast 5 to 10 mph in the morning becoming southeast in the afternoon.
* Winds…10000 FT MSL…………South 20 to 30 mph.
* Chance of Precip…………….0 percent. * CWR (>= 0.10 IN)…………….0 percent. * LAL………………………..1.
* Haines High Level Index………2 very low potential for large plume dominated fire growth.

NEEDLES, RIVER BAT. (CAZ229):
TODAY… * Sky/Weather………Sunny.
* Max temperature: * Valley floor….73-78. * 24 hr trend…..Little change.
* Min humidity: * Valley floor….9-17 percent. * 24 hr trend…..Little change.
* Wind (Slope/valley=20 ft, 10 min avg):
* Valley floor….North wind 10 to 15 mph.
* 10000 ft msl….South 10 to 15 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..3.
* Mixing height…….3100 ft agl. * Transport winds…..North 10 to 20 knots. * Ventilation………Good.

.TONIGHT… * Sky/Weather………Mostly clear.
* Min temperature: * Valley floor….40-45. * 24 hr trend…..On average up 4 degrees.
* Max humidity: * Valley floor….33-38 percent. * 24 hr trend…..Little change.
* Wind (Slope/valley=20 ft, 10 min avg):
* Valley floor….North wind up to 10 mph.
* 10000 ft msl….South 10 to 20 mph becoming 15 to 20 mph after midnight.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..4.

.FRIDAY… * Sky/Weather………Mostly sunny.
* Max temperature: * Valley floor….75-80. * 24 hr trend…..On average up 2 degrees.
* Min humidity: * Valley floor….12-20 percent. * 24 hr trend…..On average up 3 percent.
* Wind (Slope/valley=20 ft, 10 min avg):
* Valley floor….North wind up to 10 mph.
* 10000 ft msl….South 15 to 20 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..3.
* Mixing height…….3500 ft agl. * Transport winds…..North around 10 knots. * Ventilation………Fair.

STATELINE – CLARK COUNTY BORDER (NVZ465):
TODAY… * Sky/Weather………Sunny.
* Max temperature: * 4000 feet…….63-68. * 24 hr trend…..Little change.
* Min humidity: * 4000 feet…….11-16 percent. * 24 hr trend…..Little change.
* Wind (slope/valley=20 ft, 10 min avg):
* Slope/valley….Northeast winds 10 to 15 mph with gusts to around 25 mph.
* 10000 ft msl….South 10 to 15 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..3.
* Mixing height…….3200 ft agl.
* Transport winds…..Northwest around 10 knots shifting to the northeast in the afternoon.
* Ventilation………Fair.

.TONIGHT… * Sky/Weather………Mostly clear.
* Min temperature: * 4000 feet…….34-39. * 24 hr trend…..On average up 4 degrees.
* Max humidity: * 4000 feet…….35-40 percent. * 24 hr trend…..On average up 2 percent.
* Wind (slope/valley=20 ft, 10 min avg):
* Slope/valley….North winds 10 to 15 mph.
* 10000 ft msl….South 10 to 20 mph.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..3.

.FRIDAY… * Sky/Weather………Sunny.
* Max temperature: * 4000 feet…….67-72. * 24 hr trend…..On average up 4 degrees.
* Min humidity: * 4000 feet…….13-18 percent. * 24 hr trend…..On average up 2 percent.
* Wind (slope/valley=20 ft, 10 min avg):
* Slope/valley….Northeast winds up to 10 mph.
* 10000 ft msl….South 15 to 20 mph becoming 15 to 25 mph in the afternoon.
* CWR (>= 0.10 in)….0 percent. * LAL……………..1. * Haines Index……..3.
* Mixing height…….2600 ft agl. * Transport winds…..Light winds. * Ventilation………Marginal.

*La Jolla CA
Thursday
Sunny, with a high near 65. Northwest wind around 5 mph.
Thursday Night
Mostly clear, with a low around 51. Calm wind.
Friday
Increasing clouds, with a high near 65. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
Showers likely after 10pm. Mostly cloudy, with a low around 51. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

*Poway CA
Thursday
Sunny, with a high near 77. Southeast wind around 5 mph becoming west in the morning.
Thursday Night
Mostly clear, with a low around 50. Calm wind becoming east around 5 mph after midnight.
Friday
Sunny, with a high near 75. Southeast wind 5 to 10 mph becoming southwest in the morning.
Friday Night
Showers likely after 10pm. Mostly cloudy, with a low around 48. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

*CEDAR CITY Ut.
DAYS TWO THROUGH SEVEN…Thursday through Tuesday

The next storm system to impact the outlook area will track east across Arizona late Saturday afternoon through early Sunday. Precipitation with this storm will reach into the southern Utah beginning Saturday afternoon, with the heaviest precipitation occurring across southern and eastern Utah Saturday night. Most
locations will receive rain or a rain/snow mix, with accumulating snow more common in the higher elevations Saturday night through early Sunday.

A second storm system will impact mainly the northern third of the outlook area Monday through at least early Tuesday. Accumulating snow will be possible across the northern Utah mountains and adjacent valleys with this second storm.

Thursday
Sunny, with a high near 47. Light and variable wind becoming southwest 5 to 8 mph in the morning.
Thursday Night
Clear, with a low around 25. Southeast wind 5 to 7 mph.
Friday
Sunny, with a high near 58. West wind around 6 mph.
Friday Night
Snow likely, mainly after 5am. Partly cloudy, with a low around 32. South southeast wind 3 to 6 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

*************************** L.A COUNTY ********************************
WEAK NORTHEASTERLY WINDS THROUGH FRIDAY MORNING…

…CHANCE OF LIGHT SHOWERS FRIDAY NIGHT AND SATURDAY…
LOS ANGELS CO. SAN GABRIEL VALLEY (CAZ548):
.THURSDAY… Sky/weather………Mostly sunny.
Max temperature…..74-79. 24 hr trend……Up 3-5.
Min humidity……..15-25 percent. 24 hr trend……Down 20-30.
20-foot winds…….Variable 3-6 mph becoming southwest to west 6-12 mph in the afternoon.
Marine layer……..900 ft asl. LAL……………..1. CWR (>0.10 IN)……0 percent.

.THURSDAY NIGHT… Sky/weather………Mostly clear.
Min temperature…..48-54.
Max humidity……..50-70 percent except 40-50 percent in the hills.
20-foot winds…….Southwest to west 6-12 mph in the evening becoming variable 3-6 mph.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.FRIDAY… Sky/weather………Mostly sunny then becoming partly cloudy.
Max temperature…..71-76.
Min humidity……..20-35 percent.
20-foot winds…….Variable 3-6 mph becoming southwest to west 8-15 mph in the afternoon.
LAL……………..1. CWR (>0.10 IN)……0 percent.

LOS ANGELES COUNTY SAN FERNANDO VALLEY (CAZ547):
THURSDAY… Sky/weather………Sunny.
Max temperature…..72-77. 24 hr trend……Up 3-5.
Min humidity……..15-25 percent. 24 hr trend……Down 15-25.
20-foot winds…….North to northeast 8-15 mph with local gusts to 25 mph becoming southeast to south 6-12 mph in the afternoon.
Marine layer……..900 ft asl. LAL……………..1. CWR (>0.10 IN)……0 percent.

.THURSDAY NIGHT… Sky/weather………Mostly clear.
Min temperature…..45-55.
Max humidity……..40-55 percent except 30-40 percent in the hills.
20-foot winds…….Southeast to south 6-12 mph in the evening becoming north to northeast overnight.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.FRIDAY… Sky/weather………Mostly sunny then becoming partly cloudy.
Max temperature…..68-75.
Min humidity……..20-35 percent.
20-foot winds…….North to northeast 5-15 mph becoming southeast to south in the afternoon.
LAL……………..1. CWR (>0.10 IN)……0 percent.

SANTA CLARITA VALLEY (CAZ288):
THURSDAY… Sky/weather………Sunny.
Max temperature…..70-76. 24 hr trend……Little change.
Min humidity……..8-15 percent. 24 hr trend……Down 10-15.
20-foot winds…….North to northeast 15-25 mph with gusts to 35 mph decreasing to 5-15 mph in the afternoon.
Marine layer……..900 ft asl.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.THURSDAY NIGHT… Sky/weather………Mostly clear.
Min temperature…..44-50.
Max humidity……..30-45 percent.
20-foot winds…….North to northeast 5-15 mph with local gusts to 25 mph.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.FRIDAY… Sky/weather………Mostly sunny then becoming partly cloudy.
Max temperature…..69-73.
Min humidity……..18-25 percent.
20-foot winds…….North to northeast 5-15 mph with local gusts to 25 mph becoming southeast to south 5-15 mph in the afternoon.
LAL……………..1. CWR (>0.10 IN)……0 percent.

SANTA MONICA MOUNTAINS RECREATIONAL AREA (CAZ246):
.THURSDAY… Sky/weather………Mostly sunny.
Max temperature…..68-75. 24 hr trend……Up 3-6.
Min humidity……..25-40 percent. 24 hr trend……Down 20-30.
20-foot winds…….
Valleys/lwr slopes…North to northeast 10-20 mph with gusts to 25 mph becoming variable 5-15 mph in the afternoon.
Ridges/upr slopes….Northeast 10-20 mph with gusts to 25 mph becoming variable 5-15 mph in the afternoon.
Marine layer……..900 ft asl.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.THURSDAY NIGHT… Sky/weather………Mostly clear.
Min temperature…..45-55.
Max humidity……..35-55 percent.
20-foot winds…….
Valleys/lwr slopes…Downslope/downvalley 3-6 mph.
Ridges/upr slopes….Variable 5-10 mph.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.FRIDAY… Sky/weather………Mostly sunny then becoming partly cloudy.
Max temperature…..62-70.
Min humidity……..25-40 percent.
20-foot winds…….
Valleys/lwr slopes…North to northeast 5-10 mph becoming south to southwest 8-15 mph in the afternoon.
Ridges/upr slopes….Northeast 5-10 mph becoming southwest 8-15 mph in the afternoon.
LAL……………..1. CWR (>0.10 IN)……0 percent.

ANGELES NATIONAL FOREST (CAZ254):
.THURSDAY… Sky/weather………Sunny.
Max temperature…..64-73 low elevations to 54-64 higher elevations. 24 hr trend……Little change.
Min humidity……..8-18 percent. 24 hr trend……Down 5-10.
20-foot winds…….
Valleys/lwr slopes…North to northeast 15-25 mph with gusts to 40 mph decreasing to 5-15 mph with gusts to 25 mph in the afternoon.
Ridges/upr slopes….Northeast to east 10-20 mph with gusts to 30 mph becoming southeast 5-15 mph in the afternoon.
Marine layer……..None. LAL……………..1. CWR (>0.10 IN)……0 percent.

.THURSDAY NIGHT… Sky/weather………Mostly clear.
Min temperature…..47-54 low elevations to 38-47 colder valleys and peaks.
Max humidity……..15-25 percent except 25-40 percent colder valleys.
20-foot winds…….
Valleys/lwr slopes…Northeast to east 5-15 mph with local gusts to 25 mph.
Ridges/upr slopes….Southeast 5-15 mph.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.FRIDAY… Sky/weather………Mostly sunny then becoming partly cloudy.
Max temperature…..64-72 low elevations to 54-64 higher elevations.
Min humidity……..10-25 percent.
20-foot winds…….
Valleys/lwr slopes…Northeast to east 5-15 mph with local gusts to 25 mph becoming upvalley 6-12 mph with gusts to 20 mph in the afternoon.
Ridges/upr slopes….Southeast to south 5-15 mph.
LAL……………..1. CWR (>0.10 IN)……0 percent.

ANTELOPE VALLEY (CAZ259):
.THURSDAY… Sky/weather………Sunny.
Max temperature…..62-71. 24 hr trend……Little change.
Min humidity……..8-15 percent. 24 hr trend……Down 5-10.
20-foot winds…….Northeast to east 5-15 mph with local gusts to 25 mph.
Marine layer……..None. LAL……………..1. CWR (>0.10 IN)……0 percent.

.THURSDAY NIGHT… Sky/weather………Mostly clear.
Min temperature…..35-45.
Max humidity……..35-55 percent except 25-35 percent in the hills.
20-foot winds…….East to southeast 5-15 mph.
LAL……………..1. CWR (>0.10 IN)……0 percent.

.FRIDAY… Sky/weather………Mostly sunny then becoming partly cloudy.
Max temperature…..63-73.
Min humidity……..12-20 percent.
20-foot winds…….East to southeast 5-15 mph with local gusts to 25 mph.
LAL……………..1. CWR (>0.10 IN)……0 percent.
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THIS DAY IN WEATHER HISTORY:
1995: It was 95° in Santa Ana, the highest temperature on record for February.

1993: Heavy rain across the region started on 2/18 and ended on this day. One to two inches fell in Carlsbad. Flooding occurred from Oceanside to Encinitas. Homes were damaged along the Mojave River in Hesperia.

1985: A sticky white rain fell across Southern California. Apparently, strong winds blew dust from the dry Owens and China Lakes and mixed with rain clouds. Everything was covered with fine white grit, slightly alkaline, but non-toxic.

1980: Six storms that began on 2/13 hit Southern California continuing on this day. By 2/21, 12.75 inches measured in LA. 30 were killed in widespread floods and mud slides. Roads and hundreds of homes destroyed or damaged. Post-fire flooding overwhelmed a basin below Harrison Canyon in north San Bernardino four times. Forty homes were damaged or destroyed there. Mission Valley was completely inundated between Friars Rd. and I-8. A tornado hit the Clairemont area of San Diego on this day causing considerable property damage. Large waves hit the coast during this stormy period, causing coastal flooding at Mission Beach, including water over the boardwalk and into houses. This day marked the end of seven consecutive days (the most on record) of measurable precipitation in Victorville, which started on 2/14. This also occurred on 2/18-24/2005, 1/13-19/1993, and 12/22-28/1971.

1969: Heavy snow in the mountains that began on this day and ended on 2/25 brought snow depths approaching the greatest depths on record. Strong storm winds caused outages of telephone service, power, and gas. Heavy rain starting on 2/16 ended on 2/26. Up to 30 inches of precipitation fell on the south slopes of Mt. San Gorgonio, 13 inches was recorded northwest of Mt. San Jacinto, around ten inches at Banning, less than one inch in eastern Coachella Valley. The death and destruction continued from the previous month. 21 died from flooding and mud slides all over California. An entire family was killed in Mt. Baldy Village when a mud slide hit their home. Extensive damage hit crops, farmland and livestock. Creeks around Yucaipa all left their banks and substantial flooding occurred to residences and businesses. In the upper desert farmlands became lakes and more than 100 homes along the Mojave River were damaged. Roads and bridges recently repaired from previous month’s damage either washed out or were destroyed again.

1891: A prolonged storm dropped 33 inches of rain in Descanso within a 60 hour period from 2/19 to 2/23. 2.56 inches fell in San Diego. There were heavy damages and losses to homes, land, livestock, transportation and power throughout the Tijuana and San Diego River Basins.

1884: Heavy rain fell in Fallbrook (more than 15 inches during the month) and more than five inches of rain fell in Spring Valley since 2/14 to this day. Flooding and damage resulted in crops, livestock and railroads, particularly the railroad through Temecula Canyon. The San Diego River was “booming” through Mission Valley on 3/10.
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TROPICAL EAST PACIFIC REPORT:

Routine issuance of the Tropical Weather Outlook will resume on May 15, 2020. During the off-season, Special Tropical Weather Outlooks will be issued as conditions warrant.

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CURRENT WEATHER @ HESP. @ 0720 Hrs. TEMP: 380 RH: 54% WIND: NE 3 G 8
3.21” RF @ HESP. STA.SINCE OCT. 1st/20 Yr Avg: 7.12” : MONTH: 0.00” YTD S/F: 4.50” /
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FIRES: UPDATED

National Preparedness Level (PL 1 )

CDF FIRES TO DATE (STATE LANDS SRA)

Southern California Area (PL 1 )
No Reportable Incidents

Northern California Area (PL 1 )
No Reportable Incidents

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