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Organization: National Weather Service
Date: July 17, 2009
Heat Wave to Persist Through the Weekend
400 PM PDT FRI JUL 17 2009
    CONTINUED HOT TEMPERATURES EXPECTED TO PERSIST ACROSS INLAND AREAS THROUGH AT LEAST EARLY NEXT WEEK...
    A STRONG UPPER LEVEL HIGH PRESSURE SYSTEM CENTERED OVER THE DESERT SOUTHWEST WILL CONTINUE TO BRING HOT TEMPERATURES ACROSS INLAND AREAS OF SOUTHERN CALIFORNIA THROUGH AT LEAST EARLY NEXT WEEK. HIGH TEMPERATURES IN THE VALLEYS ARE GENERALLY EXPECTED TO RANGE BETWEEN 95 AND 105 DEGREES...WITH SUNDAY EXPECTED TO BE THE WARMEST DAY.
    HIGH TEMPERATURES IN THE ANTELOPE VALLEY ARE EXPECTED TO RANGE BETWEEN 102 AND 110 DEGREES THROUGH SUNDAY...APPROACHING RECORD LEVELS.
    MOUNTAIN HIGH TEMPERATURES ARE GENERALLY EXPECTED TO RANGE BETWEEN 90 AND 107 DEGREES. THE COMBINATION OF THESE HOT TEMPERATURES WITH SUFFICIENT MOISTURE WILL CONTINUE TO GENERATE HEAT INDEX VALUES OF 100 DEGREES OR GREATER THROUGH SUNDAY...RESULTING IN EXCESSIVE HEAT WARNINGS BEING POSTED FOR THE MOUNTAINS OF SOUTHWEST CALIFORNIA. HEAT INDEX IS A MEASURE OF DISCOMFORT LEVEL BASED ON THE COMBINATION OF TEMPERATURE AND HUMIDITY. AT THIS TIME...IT APPEARS THAT HEAT INDEX VALUES WILL REMAIN BELOW CRITICAL HEAT WARNING THRESHOLDS FOR THE VALLEYS AND ANTELOPE VALLEY THROUGH SATURDAY...BUT WARNINGS MAY BE NEEDED BY SUNDAY FOR PORTIONS OF THE VALLEYS AS MOST AREAS ARE EXPECTED TO RECEIVE THEIR HIGHEST TEMPERATURES OF THIS CURRENT HEAT WAVE.
    TEMPERATURES ALONG THE COASTAL PLAIN HAVE BEEN MODERATED BY THE COMBINATION OF ONSHORE FLOW AND A PERSISTENT MARINE LAYER. HOWEVER OVER THE WEEKEND...THERE IS EXPECTED TO BE LESS MARINE INFLUENCE AND WEAKER ONSHORE FLOW. AS A RESULT...TEMPERATURES WILL INCREASE OVER THE INTERIOR PORTIONS OF THE COASTAL PLAIN...WITH WARMEST LOCATIONS EXPECTED TO CLIMB ABOVE 90 DEGREES.
    THE VERY WARM AIR MASS COMBINED WITH INCREASING MOISTURE WILL ALSO BRING WARMER MINIMUM TEMPERATURES THROUGH THE WEEKEND. MANY VALLEY...MOUNTAIN...AND DESERT LOCATIONS WILL HAVE MINIMUM TEMPERATURES REMAINING IN THE 70S...MINIMIZING THE RELIEF FROM HEAT STRESS IN THESE AREAS.
    THERE IS HIGH CONFIDENCE THAT THIS CURRENT HEAT WAVE WILL PERSIST ACROSS INLAND AREAS THROUGH AT LEAST EARLY NEXT WEEK. LONG RANGE COMPUTER MODELS ARE CONTINUING TO INDICATE THE POTENTIAL FOR A LONG DURATION HEAT WAVE ACROSS INLAND AREAS...WITH TEMPERATURES LIKELY REMAINING ABOVE NORMAL FOR VALLEYS...MOUNTAINS...AND DESERTS THROUGH MUCH OF NEXT WEEK.
    THE PROLONGED HEAT WAVE THAT IS ANTICIPATED FOR INLAND AREAS OF SOUTHWEST CALIFORNIA CAN BE DANGEROUS...ESPECIALLY FOR THE ELDERLY...SMALL CHILDREN...AND PETS. IF YOU PLAN ON BEING OUTDOORS...REMEMBER TO REMAIN HYDRATED BY DRINKING PLENTY OF WATER...WEAR LOOSE-FITTING CLOTHING AND A HAT...AND REMAIN IN THE SHADE OR INDOORS AS MUCH AS POSSIBLE.
    NEVER LEAVE CHILDREN OR PETS IN CARS WITH THE WINDOWS UP OR EVEN CRACKED DURING THE DAY...EVEN FOR A VERY SHORT TIME...AS TEMPERATURES CAN QUICKLY REACH LETHAL LEVELS.
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