491 WWUS76 KLOX 041552 NPWLOX URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 852 AM PDT THU JUL 4 2013 ...EXCESSIVE HEAT CONDITIONS EXPECTED TO CONTINUE ACROSS THE LOWER MOUNTAIN ELEVATIONS OF SOUTHWESTERN CALIFORNIA THROUGH INDEPENDENCE DAY... .IT WILL REMAIN HOT AND HUMID ACROSS THE MOUNTAINS THROUGH THE FOURTH OF JULY...ESPECIALLY AT LOWER ELEVATIONS. HEAT INDEX READINGS WILL CLIMB TO BETWEEN 100 AND 105 IN MANY LOWER ELEVATION LOCATIONS EACH AFTERNOON. CAZ052>054-050300- /O.CON.KLOX.EH.W.0001.000000T0000Z-130705T0300Z/ SANTA BARBARA COUNTY MOUNTAINS-VENTURA COUNTY MOUNTAINS- LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE- INCLUDING THE CITIES OF...SAN MARCOS PASS... SAN RAFAEL WILDERNESS AREA...DICK SMITH WILDERNESS AREA... LOCKWOOD VALLEY...MOUNT PINOS...ACTON...MOUNT WILSON...SANDBERG 852 AM PDT THU JUL 4 2013 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING... * TEMPERATURES AND HEAT INDEX...AFTERNOON TEMPERATURES AND HEAT INDEX READINGS ARE EXPECTED TO CLIMB TO BETWEEN 100 AND 105 DEGREES AT ELEVATIONS BELOW 4500 FEET. HIGHER MOUNTAIN ELEVATIONS WILL ALSO HAVE TEMPERATURES APPROACH RECORD LEVELS WITH TEMPERATURES WELL INTO THE 80S AND 90S. IT WILL REMAIN VERY WARM OVERNIGHT TONIGHT...WITH TEMPERATURES BOTTOMING OUT ONLY IN THE 70S AND LOWER 80S IN MANY LOCATIONS. * IMPACTS...CHILDREN...THE ELDERLY...AND PEOPLE WITH CHRONIC AILMENTS ARE THE MOST SUSCEPTIBLE TO HEAT-RELATED ILLNESS. HEAT EXHAUSTION...CRAMPS...OR IN EXTREME CASES HEAT STROKE CAN RESULT FROM PROLONGED EXPOSURE TO THESE CONDITIONS. PEOPLE SHOULD AVOID STRENUOUS OUTDOOR ACTIVITIES...INCLUDING HIKING AND MOUNTAIN BIKING...DURING THE WARMEST PARTS OF THE DAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REDUCE RISK DURING OUTDOOR WORK THE OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE IS AN EMERGENCY - CALL 911. ALSO...NEVER...EVER LEAVE CHILDREN... THE ELDERLY OR PETS IN ENCLOSED VEHICLES...EVEN FOR A SHORT PERIOD OF TIME. EVEN IF THE WINDOWS ARE PARTIALLY OPEN... TEMPERATURES CAN QUICKLY RISE TO LIFE-THREATENING LEVELS. && $$