Monday, September 30, 2013

[californiadisasters] Santa Ana Wind Weather Bulletin (9/30/13-PM)



...POTENTIAL FOR A VERY WARM AND DRY SANTA ANA WIND EVENT WITH     HIGH FIRE DANGER LATE THURSDAY NIGHT THROUGH SATURDAY...    ON THURSDAY...AN UPPER LEVEL TROUGH OF LOW PRESSURE WILL DIG  SOUTHWARD INTO THE GREAT BASIN WHILE AN UPPER LEVEL RIDGE OF HIGH  PRESSURE BUILDS OFF THE WEST COAST. INITIALLY...DRY NORTHERLY  WINDS WILL IMPACT SAN LUIS OBISPO AND SANTA BARBARA COUNTIES ON  THURSDAY AFTERNOON AND EVENING. AS SURFACE HIGH PRESSURE BUILDS  INTO NEVADA...THE LOW LEVEL FLOW WILL SHIFT TO THE NORTHEAST  ACROSS MUCH OF SOUTHERN CALIFORNIA LATE THURSDAY NIGHT OR FRIDAY  MORNING...WITH GUSTY SANTA ANA WINDS FORECASTED TO PERSIST THROUGH  SATURDAY.    PRELIMINARY INDICATIONS SUGGEST THIS SANTA ANA WIND EVENT WILL BE  SLIGHTLY STRONGER AND DRIER THAN OUR LAST EVENT ON FRIDAY. THE FOCUS  OF THE OFFSHORE WINDS WILL BE LOS ANGELES AND VENTURA COUNTIES.  MOUNTAIN AREAS COULD SEE WIND GUSTS IN THE 40 TO 50 MPH  RANGE...WHILE COASTAL AND VALLEY AREAS WILL GENERALLY EXPERIENCE GUSTS  BETWEEN 30 AND 40 MPH. THE GUSTY SANTA ANA WINDS ARE EXPECTED  TO BRING SIGNIFICANT WARMING AND DRYING TO THE DISTRICT. TEMPERATURES  ON FRIDAY AND SATURDAY ARE EXPECTED TO CLIMB INTO THE 90S ACROSS PORTIONS  OF THE VALLEYS AND COASTAL PLAIN. MEANWHILE...HUMIDITIES ARE EXPECTED  TO LOWER RAPIDLY INTO THE SINGLE DIGITS ON FRIDAY...WITH CONTINUED  VERY DRY CONDITIONS INTO SATURDAY.    THE COMBINATION OF GUSTY SANTA ANA WINDS WITH VERY LOW HUMIDITIES  AND WARM TEMPERATURES WILL BRING A SIGNIFICANT THREAT OF CRITICAL  FIRE WEATHER CONDITIONS TO SOUTHERN CALIFORNIA LATE THURSDAY NIGHT  THROUGH SATURDAY. A FIRE WEATHER WATCH HAS ALREADY BEEN POSTED FOR  MUCH OF LOS ANGELES AND VENTURA COUNTIES. EXTREMELY DRY FUEL  CONDITIONS IN PLACE WOULD ALLOW FOR LARGE AND RAPID FIRE GROWTH  POTENTIAL IF WINDS AND DRY AIR DEVELOP AS PROJECTED LATE IN THE  WEEK.    RESIDENTS OF SOUTHWEST CALIFORNIA ARE URGED TO STAY TUNED TO THE LATEST  NATIONAL WEATHER SERVICE STATEMENTS AND WARNINGS ON THIS DEVELOPING  WEATHER SITUATION.    $$    GOMBERG/SMITH



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