Here’s a bulletin from the National Weather Service for Azusa, where a 700 acre wildfire continues to burn above Morris Dam:
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.