{"id":375,"date":"2026-05-29T04:04:31","date_gmt":"2026-05-29T04:04:31","guid":{"rendered":"https:\/\/sanfranciscomovingguide.com\/?p=375"},"modified":"2026-05-29T04:04:31","modified_gmt":"2026-05-29T04:04:31","slug":"cut-off-weather-pattern-brings-unexpectedly-heavy-rain-to-bay-area","status":"publish","type":"post","link":"https:\/\/sanfranciscomovingguide.com\/?p=375","title":{"rendered":"‘Cut-off’ weather pattern brings unexpectedly heavy rain to Bay Area"},"content":{"rendered":"
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The Bay Area saw unexpectedly heavy rain showers on Thursday, with San Francisco receiving close to the monthly average rainfall for May. Roger Gass, a meteorologist at the National Weather Service\u2019s Bay Area office, said downtown San Francisco saw 0.58 inch of rain in the past 24 hours. The monthly May average for rainfall is 0.64 inch.\u00a0<\/p>

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The rainfall amount ended up being greater than what had been forecast in the Bay Area, according to\u00a0Gass.<\/p><\/div>

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The reason for the wet weather was a \u201ccut-off low,\u201d where a low-pressure system is separated from the main airflow. The phenomenon is also dubbed a\u00a0\u201cweatherman\u2019s woe\u201d since it allows unsettled or wet weather to linger for days instead of moving more quickly through an area. Gass said this system was a little unusual in that it \u201cdropped out of the Gulf of Alaska\u201d when normally, at this time of year, California sees monsoon moisture coming from the Southwest.<\/p><\/div>

\u201cIt\u2019s not unheard of, but it is a late-season rainmaker,\u201d he said.<\/p><\/div>

The North Bay also had more rain than anticipated by the National Weather Service, with some coastal areas seeing up to 0.75 inch of rain and most of the region getting a solid half inch of precipitation.<\/p><\/div>

Gass said the wet weather will stick around through the morning commute in the Bay Area before tapering off midday for most of the region.<\/p><\/div>

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\u201cWe may still have some lingering in areas like San Jose through mid-afternoon, but the focus is really going to shift to the south,\u201d he said.<\/p>

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