More Thunderstorms, Chance of Flash Floods for San Diego

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San Diego won’t get relief from the mugginess Thursday as a flow of monsoonal moisture hovers over the region, bringing another chance of thunderstorms. 

A flash flood watch will go into effect for San Diego County’s mountain ranges at noon Thursday, when thunderstorms are expected to develop and bring sudden and heavy bursts of rain. The watch is set to expire at 8 p.m.

Storm Creates Strange Cloud Formations in Skies Over San DiegoStorm Creates Strange Cloud Formations in Skies Over San Diego

“There is a slight chance that those storms could sweep into our inland valleys; much lower chance though of them trying to head to the coast,” NBC 7 Meteorologist Sheena Parveen said. 

The NWS said at least isolated flash flooding is expected. Residents should be prepared to take action should Flash Flood Warnings be issued. 

Meanwhile, the inland valleys to the coast will be under a heat advisory until 8 p.m. The heat index, which combines temperatures and relative humidity to give a “feels-like” temperature, was predicted to be in the 90s. 

The NWS said during the hours of the heat advisory, dehydration, heat cramps and heat exhaustion are possible. People are urged to drink plenty of water, to stay out of the sun and to check on others. San Diego County has dozens of “cool zones” where people can go to escape the heat

A similar weather pattern brought late afternoon showers, dark clouds and lightning strikes to some parts of the county on Wendesday. 

More than an inch of rain fell in Pine Valley, and about a third of an inch had doused Alpine, Escondido and Mt. Woodson by 4:30 p.m.

The NWS reported 396 cloud-to-ground lightning strikes in the county by 6 p.m. There were 22 reported in Riverside County, one of which sparked a fire near Murrieta that had ballooned to 1,000 acres by 9 p.m. and forced evacuations.

Afternoon Summer Storm Hits San DiegoAfternoon Summer Storm Hits San Diego

Southern California’s muggy weather is due to a blast of monsoonal moisture from the Gulf Coast. That monsoonal moisture was also bringing stormy weather to the eastern parts of the county.

Conditions were expected to improve by the weekend; though temperatures would remain hot, humidity levels were expected to decrease significantly, finally bringing some relief to the region.