Red Flag warning issued in San Gabriel Mountains

AN UPPER LEVEL RIDGE OF HIGH PRESSURE OVER SOUTHERN NEW MEXICO WILL
WILL CONTINUE TO BUILD...AND SLIDE OVER SOUTHERN CALIFORNIA BY
FRIDAY. ALONG WITH WEAKENING ONSHORE FLOW...THIS WILL BRING A RETURN
TO HOT AND DRY CONDITIONS OVER MOST OF SOUTHWEST CALIFORNIA. THE
WARMEST TEMPERATURES ARE EXPECTED THURSDAY THROUGH SATURDAY...WHEN
WIDESPREAD TRIPLE DIGIT TEMPERATURES ARE EXPECTED OVER THE INTERIOR
AND VALLEY SECTIONS OF THE SOUTHLAND. TEMPERATURES UP TO AROUND 106
DEGREES ARE EXPECTED IN THE HOTTEST LOCATIONS. A FEW TEMPERATURE
RECORDS COULD BE BROKEN.

SINCE THE ONSHORE FLOW IS EXPECTED TO BE FAIRLY WEAK WITH THIS
HEAT EVENT...EVEN THE WARMEST INLAND PORTIONS OF THE COASTAL PLAIN
WILL LIKELY SOAR INTO THE 90S. THE BEST RELIEF WILL BE NEAR THE
IMMEDIATE COAST WHERE TEMPERATURES WILL REMAIN IN THE 70S AND 80S.

THE AIR MASS IS EXPECTED TO BE FAIRLY DRY THROUGH THIS WEEK.
ALTHOUGH THIS SHOULD HELP KEEP HEAT INDEX READINGS FROM REACHING
CRITICAL LEVELS...HUMIDITY READINGS WILL FALL INTO SINGLE DIGITS
OVER THE INTERIOR VALLEYS AND MOUNTAINS. THIS WILL BRING HEIGHTENED
FIRE WEATHER CONCERNS...ESPECIALLY TO THE MOUNTAIN AREAS WHERE
LITTLE TO NO OVERNIGHT RECOVERIES ARE EXPECTED. SOME SUB-TROPICAL
MOISTURE MAY RETURN TO SOUTHWEST CALIFORNIA THIS WEEKEND...WHICH
COULD HELP HUMIDITIES RECOVER ABOVE SINGLE DIGITS.

THE LONG DURATION HEAT EVENT COULD POSE HEALTH HAZARDS FOR ANYONE
OUTDOORS...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
CRACKED DURING THE DAY...EVEN FOR A VERY SHORT TIME...AS
TEMPERATURES CAN QUICKLY REACH LETHAL LEVELS.