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An excessive heat warning scheduled to last through Thursday went into its second day Tuesday amid health concerns, especially for the very young and very old.

The hottest days of the heat wave are expected to be Tuesday and Wednesday, according to a National Weather Service statement. Overnight low temperatures will offer little reprieve from the heat, ranging from 66-76 degrees.

The conditions will create “increased potential for serious heat-related illnesses, especially for the young and elderly, those performing outdoor activities, as well as those without access to air conditioning,” warned the statement. It will also create an increased potential for power outages because of the widespread use of air-conditioning.

Southern California residents were urged to take steps to protect themselves from the conditions, scheduling strenuous activities for the coolest part of the day — in the morning or evening — wearing lightweight and light-colored clothing and drinking plenty of water.

Forecasters also stressed that “young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes.” The warning also covers seniors.

The excessive heat warning will be in force along the L-A. County coast, in beach cities, metropolitan Los Angeles, Downtown L.A., and the Hollywood Hills; the San Gabriel, San Fernando, Santa Clarita and Antelope valleys; the San Gabriel and Santa Monica mountains; and inland Orange County, where highs will range from the mid 90s to 104. It will expire at 8 p.m. Thursday. Also in effect was a less serious heat advisory scheduled to expire in Orange County at 9 p.m. Thursday.

Along the coast, a high surf advisory will be in force in L.A. and Orange countils until 9 p.m. Wednesday. Surf of 4-7 feet is expected through Wednesday night in L.A and Ventura counties, with maximum sets to 9 feet. In Orange County, surf of 5-8 feet is expected.

Swimming conditions along the coast will be dangerous due to the high surf, forecasters said.

“There is an increased risk for ocean drowning,” warned an NWS statement. ” Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore.”

The National Weather Service forecast sunny skies in L.A. County Tuesday and highs of 86 degrees at LAX; 89 in Avalon; 94 in Long Beach and on Mount Wilson; 96 in Downtown L.A.; 100 in San Gabriel; 102 in Pasadena; 103 in Burbank; 108 in Palmdale and Lancaster; 109 in Woodland Hills; and 110 in Saugus.

Sunny skies were also forecast in Orange Counties, along with highs of 81 in San Clemente; 82 in Laguna Beach; 83 in Newport Beach; 96 in Irvine; 98 in Anaheim and Mission Viejo; 100 in Yorba Linda and Fullerton.

Temperatures will remain at roughly the same temperatures through Thursday, then begin to slowly retreat.

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