Temperatures will climb again Monday, with some areas of the Southland expected to bake in triple-digit heat through Tuesday.
The National Weather Service said the temperature increase, coming amid a heat wave that already has lasted more than a week, results from the westward movement of a high-pressure ridge that has been parked over the Four Corners area. It said Monday and Tuesday will be hot days, with Monday expected to be the warmest.
"The long duration heat wave could pose health hazards for anyone outdoors, especially for the elderly, small children and pets," the weather service said in an advisory. "If you plan on being outdoors, remember to remain hydrated by drinking plenty of water, wear loose-fitting clothing and a hat..."
The best idea, however, is to ``remain in the shade or indoors as much as possible," according to the advisory.
The NWS issued a reminder to motorists never to leave children or pets in parked cars with the windows closed, or even cracked open, even for a very short time during the day ``as temperatures can quickly reach lethal levels.''
The NWS forecast highs today of 75 in Avalon, Newport Beach and at LAX; 84 in Long Beach; 85 in downtown L.A.; 87 in Anaheim and on Mount Wilson; 89 in San Gabriel; 92 in Burbank; 93 in Pasadena; 100 in Woodland Hills; 101 in Newhall; and 104 in Palmdale and Lancaster.
Temperatures are generally forecast to come down slightly Tuesday and again Wednesday, ending up on Friday four or five degrees below Monday's levels -- still warm, but seasonal.