'Heat dome' covers SoCal, 'dangerous' triple-digit temperatures expected

- Friday is expected to be the worst day of this week's heat wave in the Southland, with temperatures dropping only slightly on Saturday before falling into a more manageable range starting Sunday.

Temperatures of well over 100 degrees are expected throughout the valleys, and the National Weather Service has issued an excessive heat warning for the valleys and mountains through Saturday evening.

The NWS also warned of increased fire danger as the hot temperatures combine with dry conditions and gusty winds. A red flag warning is in effect until midnight Saturday in the Los Angeles County Mountains, Angeles National Forest and Antelope and Santa Clarita valleys.

Today's highs will hit the mid-80s at the beaches and the upper 90s to triple digits inland, with temps hovering around 105 to 110 degrees in parts of the San Fernando, Santa Clarita, San Gabriel and Antelope valleys.

The Los Angeles County Department of Public Health issued a heat alert for the Los Angeles Basin, the Pomona area and the valleys.

The Department of Public Health recommends that Southern Californians stay safe during the heat wave by:

  • keeping an eye on media reports for the latest weather forecasts and information from local officials;
  • learning the warning signs of heat-related illnesses;
  • staying out of direct sunlight;
  • staying hydrated;
  • reducing physical activity;
  • identifying a cool location, such as a mall, library, theater or designated cooling center (the Los Angeles Police Department recommends calling 311 within city limits and 211 within county limits to find the nearest cooling station);
  • using cool compresses, misting and baths to lower body temperatures;
  • wearing lightweight, loose-fitting clothing;
  • wearing sunscreen;
  • checking on pets, friends, family and neighbors who may be especially sensitive to excessive heat.

Additionally, the NWS notes that anyone overcome by the high temperatures should call 911 because heat stroke is an emergency.

Here are links to area cooling centers:

Forecasters warned that the triple-digit heat could present a danger to some residents, and demand for electricity could be high, creating the possibility of outages.

"Never, ever leave people or pets in enclosed vehicles, even for a short period of time,'' the NWS warned. "Take extra precautions if you work or spend  time outside. When possible, reschedule strenuous activities to early
morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose-fitting clothing when possible and drink plenty of water.''

NWS officials noted, however, that the heat wave is not expected to break local records.

"Friday through Sunday mark the 10-year anniversary of one of the hottest events on record for any month -- Woodland Hills hit 119 on July 22, 2006, the all-time high for any of our climate stations,'' according to the
Weather Service.

Inland areas could see higher-than-normal temperatures as late as next Tuesday, although coastal areas should see some cooling beginning Sunday, forecasters said.

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