Heat Advisory Issued In San Diego County

SAN DIEGO COUNTY, CA — Hot conditions were forecast through Wednesday in San Diego County, peaking Monday and Tuesday with widespread heat risk and isolated showers and a slight risk of thunderstorms over the mountains this afternoon, the National Weather Service said.

Dangerous lightning and flooding were also possible over the mountains, the NWS said.

A heat advisory was issued from 10 a.m. Monday to 8 p.m. Wednesday for San Diego County coastal areas and valleys.

An excessive heat warning was issued until 11 p.m. Tuesday for San Diego County deserts, which could get dangerously hot with temperatures of 105 to 110 degrees. Extreme heat could significantly increase the potential for heat related illnesses.

Gradual cooling was expected for the latter half of the week.

Skies were mostly clear Sunday morning, with just a few patches of low clouds offshore.

High temperatures along the coast Sunday were predicted to be in the lower 80s with overnight lows in the upper 60s. Highs in the western valleys were expected to be around 90 and near the foothills in the upper 90s with lows in the upper 60s. Highs in the mountains were expected to be in the lower 90s with lows in the upper 60s and highs in the deserts were predicted to be 104 to 109 with lows in the lower 80s.

Drier air was predicted to move in Monday and lead to dry conditions which were favored to last through the end of the week. Some rain in the mountains was expected Wednesday and Thursday ahead of an upper trough as moisture pulls back into the region.

The upper trough was forecast to lead to gradual cooling during the second half of the week with highs trending slightly below normal west of the mountains by next weekend.

Wind gusts were predicted near 20 knots across the outer waters and near San Clemente Island Sunday afternoon and evening and Monday. Otherwise, no hazardous marine weather was expected through Thursday.