Triple-digit heat on Monday will strain the electric grid. Photo courtesy SDG&E

Temperatures are expected to soar into the triple digits again Monday in parts of San Diego County, prompting authorities to shorten the school day for some students at campuses without full air conditioning and call on local utility customers to conserve energy.

A National Weather Service heat advisory for the valleys is scheduled to remain in effect until 7 p.m. Tuesday, as high pressure and weak onshore flow continue to affect the region. Forecasters said high temperatures would be in the 80s along the coastline, in the 90s a few miles inland and over 100 degrees in the far inland valleys.

“Abnormally hot temperatures can be stressful to animals and humans, making it hard for the body to acclimate and remain hydrated,” according to the weather service advisory. “Without precautions even healthy adults could experience heat stress and illness.”

National Weather Service forecast for 5 p.m. Monday.

Around 50 San Diego Unified School District schools without full air conditioning have implemented “minimum day schedules,” including Garfield, Lincoln, Point Loma and Scripps Ranch high schools, according to the district. After-school athletic activities have been canceled at all city schools.

A full list of affected schools is available on the district’s website.

District officials said the forecast for Tuesday would be closely monitored, and a decision on whether to continue the shortened schedule at affected schools would be made before noon.

Sweetwater Union High School District officials have implemented a minimum schedule at Mar Vista Academy, Castle Park and Hilltop middle schools, and Chula Vista, Mar Vista and Sweetwater high schools.

The heat wave also prompted San Diego Gas & Electric to ask its customers to lessen the strain on the electric grid by reducing their energy consumption between 11 a.m. and 6 p.m. SDG&E customers who participate in the “Reduce Your Use” program could receive a bill credit for doing so, according to the utility.

Forecasters advised area residents planning outdoor activities to try to schedule them for early morning or evening, take frequent breaks in shady or air conditioned areas and to know the signs and symptoms of heat exhaustion and heat stroke. Those headed outdoors were also advised to wear light, loose clothing and drink plenty of water.

Weather service forecasters said temperatures would cool Tuesday and Wednesday, but an “influx of monsoonal moisture from the south” would cause humidity to rise.

— City News Service

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Chris Jennewein

Chris Jennewein is Editor & Publisher of Times of San Diego.