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Friday’s forecast also called for a slight chance of thunderstorms in the mountains this afternoon and early evening as a narrow band of elevated instability drifts north with scattered thunderstorms and isolated cloud-to-ground lightning, according to the weather service.
"The combination of a deeper marine layer from a coastal eddy, mid- and high cloud cover and an increase in low level moisture in the lower deserts will bring 5 to locally 10 degrees of cooling in most areas today," according to the advisory.
A NWS heat advisory was still set to remain in effect until 9 p.m. for the deserts, where high temperatures of 106 to 112 are expected.
However, weather service meteorologists said the decrease in temperatures in the deserts would be offset by increased humidity with little change or slightly higher heat index values.
High pressure over the Four Corners area of the western United States caused temperatures to soar in parts of San Diego County on Thursday. A record high of 107 degrees was reached in Campo, according to the National Weather Service.
Weather service forecasters said hot weather can be stressful for people and pets if precautions are not taken. Kids and pets must not be left unattended in vehicles because temperatures inside can quickly rise to lethal levels.
Strenuous outdoor activities should be rescheduled to early morning or evening hours, and those planning to spend time outdoors were advised to drink plenty of water and avoid alcoholic beverages.