For the first time in nearly a month, a storm system carrying rain for the entire Bay Area region descended into the area from the Pacific Northwest early Wednesday, spreading the wet stuff beyond just the North Bay.
Still, it’s the system that’s trailing it by a few days that’s really going to deliver the haymaker.
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Rain returns to Bay Area – and could stick around through Christmas Bay Area’s December dry spell expected to reach an end Volunteers plant Bay Area’s first ‘living levee’ using treated wastewater No rain is forecast through Christmas. Is it time to worry about drought? Temperatures to rise in some areas of Bay Area as dry spell continues“That system is supposed to move in by Sunday,” National Weather Service meteorologist Roger Gass said. “That one will continue on and off during the week. So Christmas travel and any plans will be 100 percent affected by it.”
That rain from the last of three systems making their way across the Pacific Northwest is expected to measure at least an inch for the entire region and perhaps even 1½ inches minimum, according to the weather service. Forecasters believe areas of the North Bay could get between 2 and 5 inches.
The first of those systems brought light drizzle only to the North Bay on Monday, and some light showers in parts of the region late Tuesday into early Wednesday.
Some of the heavier overnight rain happened in San Francisco, where the weather service measured between three-hundredths of an inch and .07 inches in the 12 hours before 6 a.m., Gass said. The North Bay received a bit more; the weather service said nearly a half-inch fell near Guerneville and .13 inches fell in that same period.
Cities in Santa Clara, Contra Costa and Alameda counties — with the lone exception being the .01 inches that fell in Castro Valley — still were waiting for measurable rain. It will mark the first time since Nov. 20 that the Bay Area’s rain gauges in those counties will show anything.
“This rain is still kind of considered the first system,” Gass said. “This is the tail end of it. As it progresses south, it kind of falls apart. Then we get that’s a bit more substantial by Friday. Then that third system comes in Sunday.”
The arrival of the rain already has changed one part of the recent pattern significantly. Tule fog that had blanketed the region for much of the dry spell was effectively obliterated by the ocean influence from the storm systems, Gass said. The dense fog that brought more than one advisory — including one on Monday morning — is expected now to stick close to its natural home in the Central Valley.
“Anything off shore that gives us influence from the Pacific Ocean is going to keep the fog away,” Gass said. “We’re finally getting that influence back.”
Another change that has come with the rain is the lifting of what have been chilly temperatures. The thermometer was expected to get as high as 64 degrees in areas of the East Bay and South Bay on Friday, an increase of nearly 10 degrees from Monday.
“Those cold temperatures were largely due to the tule fog spreading in the Bay Area,” Gass said, adding that the conditions created the fog trapped the cold temperatures. “We’ve kind of washed that pattern out.”
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