San Diego County is experiencing a warm start to the week before a tropical twist brings a midweek cooldown, according to the National Weather Service.

Moisture from Tropical Storm Mario is expected to be pulled into the region, raising the odds of showers and thunderstorms from Wednesday evening into Thursday morning, especially in the mountains and deserts.

A low-pressure system off the Southern California coast, combined with lingering heat, could spark isolated showers and thunderstorms that produce rainfall rates of 0.5 to 0.75 inches per hour.

Temperatures are expected to run 5 to 10 degrees above average Tuesday before dipping below normal by Friday.

Highs Tuesday are forecast around 81 near the coast, 85 to 90 inland, 87 to 92 in the western valleys, 90 to 95 near the foothills

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