After a dry week marked by red flag warnings, rain is forecast to shower the Bay Area until the end of the week.
Roger Gass, a National Weather Service meteorologist, said there was a 100% chance of rain in the Bay Area, as a front moved through the region.
The wet weather that began on Monday morning should begin to taper off by Monday afternoon and diminish into the night. A break in rain is expected on Tuesday before it returns Wednesday in the North Bay and likely other parts of the region, including San Francisco, before
He forecast a break in the rain on Tuesday before chances of rain increased again on Wednesday to 100% across the North Bay and up to 70% in San Francisco before subsiding again by Friday.
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About three-fourths of an inch is expected to fall over the North Bay coastal areas on Monday, while the North Bay valley areas might see up to half an inch in precipitation. Both the South Bay and East Bay regions were expected to receive less than one-third of an inch in rainfall on Monday, Gass said.
But the heaviest rains were expected to hit the North Bay, with higher elevations set to receive three-fourths of an inch of rain, or 0.35 inches of rain around Santa Rosa. In San Francisco, there might be one-third of an inch of rain this week while the South Bay and East Bay might receive less; Gass said less than 0.15 of an inch of precipitation could fall over those areas throughout the week. A rain shadow from the mountains to the west might play a role in why less rain is falling over the Santa Clara and East Bay valleys.
Temperatures in the Bay Area are expected to be generally in the low to mid-60s throughout the week, but San Francisco was expected to reach the upper-50s, according to Gass. Humidity was forecast to be high, but fire weather and winds were not expected to be much of a concern, he said.
The cause of this “unsettled pattern” of rain is several troughs moving through the region, but the greatest potential for widespread precipitation is in the Pacific Northwest and Northern California. The weather pattern is characterized by cooler conditions and slightly above average precipitation, but no ridge of high pressure, Gass said.