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Storm System to deliver showers, possible hail warning before freezing – CBS San Francisco

SAN FRANCISCO (KPPIX) — The KPIX 5 Weather Team declared a “first day of weather alert” on Tuesday, with several different threats likely to impact the Bay Area.

A storm system in the Pacific Northwest will bring intermittent rain showers to the Bay Area Monday evening, continuing through Tuesday. Although rain is welcome after more than six weeks of dry weather, some of the showers could produce cloud-to-ground lightning and small hail.

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“There’s going to be a lot of cold air in the upper levels of the atmosphere. This increases the instability of the atmosphere, which increases the threat of cloud-to-ground lightning,” explained First Alert Chief Meteorologist Paul Heggen. “The unstable environment, coupled with the cold air, will also allow small hail to fall from any showers that manage to develop into thunderstorms.”

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Rainfall amounts will be light overall, with only a few hundredths of an inch of rain for most areas and only a 50% chance of measurable rain for any location in the Bay Area.

Once the rain showers subside on Tuesday evening, cold temperatures will take over for the rest of the week. Most of North Bay is under frost watch on Wednesday, Thursday and Friday mornings. This will likely upgrade to Freeze Warning as temperatures drop to the mid to upper 20s early in the morning.

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Other inland parts of the Bay Area will drop to near freezing, triggering a freeze advisory. Bay Area residents are advised to take care to protect sensitive vegetation and outdoor plumbing, and to ensure outdoor pets have a warm place to shelter.