The start of November will appear similar to the start of the previous month, with mild, pleasant weather giving way to increasing clouds, wind and rain — possibly accompanied by a thunderstorm or two — by Wednesday.
This time, it’s not quite as surprising as the storms that pummeled the region at the start of October.
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“November is really the first month of our rainy season,” National Weather Service meteorologist Roger Gass said Monday. “So this one is not too unusual.”
The storm that’s descending from the Gulf of Alaska also will kick off what Gass and the weather service anticipate to be a “rather wet” first part of the month. The storm is taking a typical winter pattern, and like most of those, is expected to dump most of its fury on the North Bay part of the region.
The fury could include flooding, as well as downed trees from the wind. Winds are expected to gust up to 40 or 50 mph, according to the weather service. The agency also issued a coastal flood advisory beginning at 8 a.m. Tuesday and extending to 2 p.m. Saturday for Bayshore locations extending along the San Francisco and San Pablo bays.
The East Bay, South Bay and Peninsula will receive their share of wet stuff, as well. Once the main part of the system reaches land, it will push the head of it south and rain will start to fall on the rest of the region.
It will be especially heavy in Santa Cruz County, where between a half-inch and inch of rain is expected to fall.
Elsewhere, Santa Clara, Alameda and Contra Costa counties can expected between a quarter-inch and half-inch once the main part of the system arrives Wednesday. Winds in the East Bay are expected to gust between 35-40 mph while the winds in San Jose and Santa Cruz are likely to peak between 25-30 mph.
In the North Bay coastal ranges, the rain is expected to start Monday night and pick up its pace Tuesday and Wednesday. Gass said up to 2 1/2 inches of rain or more could fall in areas such as Mount Tamalpais, while areas in the North Bay valleys, particularly Sonoma County, are expected to get 1 1/2-2 inches.
“An isolated thunderstorm or two is also possible over the North Bay,” Gass said. “We can’t rule out thunder and lightning in the East Bay, either.”
The rain should be done sometime Wednesday night or early Thursday morning, according to the weather service, with clear sky and upper 60-degree temperatures to follow before cloud-filled sunny days and temperatures in the high 60s and low 70s follow for the weekend.
