File photo courtesy OnScene.TV

Thunderstorms began to develop in San Diego County Sunday, leading the National Weather Service to issue a severe thunderstorm warning for part of the county’s mountainous backcountry.

The Warner Springs area north of Julian was to remain under the warning starting at 3 p.m., and the first warning extended to 4 p.m. Sunday.

Increasing monsoon moisture will lead to the development of some storms focused over the mountains, though a few storms could occur in the valleys and along the coast as well, forecasters said.

Julian and Palomar Mountain both faced a 42 percent chance of thunderstorms Sunday. Ramona, Alpine and Escondido all had a 14-19 percent chance of precipitation, while most of the coastline had a chance below 10 percent.

Skies were cloudy throughout much of the region, and temperatures in the 70s along the coast gave way to temperatures in the 90s further inland.

–City News Service

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