SBD SANTA ANA WINDS UPDATE 9/23/17@1820

Weather Summary

An offshore flow pattern will develop Sunday, and then strengthen through the middle of the week. Main concerns are with an extended period of near-critical fire weather conditions along with very warm temperatures for areas away from the immediate coast. The hottest weather will occur in the inland valleys where temperatures will soar into the 90s and may reach near 100 in the hottest locations. These temperatures will be a bit of a shock for residents spoiled by the recent cool weather pattern. There will also be periods of gusty offshore winds and hot weather, but not likely to meet those critical wind or heat thresholds.

Weather Threats and Impacts:

  • Near-critical fire weather conditions for much of the work week
  • Gusty offshore winds at times may make for hazardous travel in the wind prone passes
  • Well above normal temperatures will be a concern for at-risk populations for health impacts

Forecast Winds:

  • Gusty Northeast offshore winds expected along the coastal foothills and below passes and canyons of San Bernardino, Riverside, and Orange Counties
  • Mainly Monday through Wednesday
  • Occasional gusts up to 40 mph

Forecast Relative Humidity:

Afternoon humidities bottoming out between 10-20 percent in Inland Valleys and Mountains.

Timing:

Offshore flow pattern develops Sunday, and becomes stronger Monday through Wednesday. Pattern doesn’t really reach strong offshore levels, but the extended nature will be noteworthy as it will likely last through the end of the work week.

 

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