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SAN DIEGO — Carlsbad beaches have reopened after earlier reports of lightning forced the coastline to remain off-limits Monday afternoon as thunderstorms and rain passed through parts of San Diego County.

“Carlsbad Fire Dept. will continue to monitor weather conditions in case things change,” city officials tweeted.

Showers and isolated thunderstorms associated with an upper low moved into San Diego County and across the ocean waters as of 2:57 p.m., according to the National Weather Service, with activity expected to increase through Monday night and into Tuesday morning.

The NWS tweeted at 2:20 p.m. that lighting was detected near Del Mar, which continued into Solana Beach and Encinitas.

Be alert for threatening weather and darkening skies with brief heavy rain and dangerous lightning, the NWS advised. For anyone at those beaches, be sure to get indoors until it passes.

City News Service contributed to this report.