A group of people wait in the rain to ride the trolley up Powell Street in San Francisco, Calif. Friday, November 10, 2017. (Daniel Kim/Special to S.F. Examiner)

This week’s storms may not help much after dry December

Rainfall is set to sweep through the Bay Area beginning Wednesday morning, but it may not be enough to make up for a dry December, according to the National Weather Service.

Last month marked the fourth driest December in San Francisco’s recorded history, with only 0.15 inches of rainfall.

“Currently we’re running about six inches below normal for this time of year,” said Steve Anderson, a forecaster with the weather service. “The rain for the next five days won’t really make a dent in that.”

This week may see a half-inch to an inch of rainfall, Anderson said. Since the rain season began Oct. 1, local rainfall is at 37 percent of normal for this time of year, he added.

“Just to compare, last year at the same time, downtown San Francisco was 100 percent normal,” he said.

This week’s wet weather may extend through Saturday, according to the weather service. Though rain this week may not make up for The City’s rain deficits, there are still three months left in the rainy season, Anderson said.

That’s “plenty of time” for the rain to catch up, he said.

Meanwhile, San Francisco will say goodbye to the recent “king tides” on Wednesday. The exceptionally high tides hit San Francisco’s watery borders Monday and Tuesday, according to the weather service, which advised caution.

“There’ll even be water splashing up along The Embarcadero, even places people jog along,” Anderson said. The weather service issued a coastal flood advisory for Monday and Tuesday.

“As always, people should treat the ocean with respect” and caution, Anderson said.

But the rain won’t affect those so-called king tides, which are governed by the moon’s gravitational pull, and the Earth’s orbit.

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