The first rain of the rainy season pours an inch into parts of the Bay Area



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The first storm of the rainy season, Tuesday, dumped nearly an inch of rain over parts of the Bay Area, making the roads particularly slippery for commuters in the morning.

Parts of North Bay – Petaluma, Santa Rosa and Sevastopol – have been sprayed with almost an inch of rain, according to the National Weather Service.


San Francisco had received nearly a tenth of an inch around 7 am, but the storm's main "rush band" had not yet arrived in the city, said Drew Peterson, a weather forecaster at the National Weather Service.

By 9 am, the showers are expected to strengthen in the city, he added.

This is the first measurable rainfall in San Francisco since June 9, when 0.01 inch was reported.

East Bay and South Bay did not suffer much from the last storm.


Tuesday's rush is expected to last until Wednesday, said Peterson, but the showers "are going to be really very uneven."

"In most places, a few extra hundredths will be collected," he said. "Most areas will not be affected by these showers."

Temperatures throughout the Bay Area will remain mild before a warming trend this weekend.

Tuesday, San Francisco is expected to reach 68 degrees, Oakland, 73 degrees and San Jose, 78 degrees.



Similar temperatures will continue throughout the week, to a few degrees, said Peterson.

Friday night's night temperatures in San Francisco, Oakland and San Jose will drop in the mid-50s.

Temperatures for Petaluma and Santa Rosa will remain in the 70s for most of the week before reaching the 80s on Saturday and Sunday.

Forecasters warned that the storm was the first of the season. The engine oil accumulated on the roads can make driving more dangerous due to the presence of slippery slicks. Morning passengers should slow down and use the headlights whenever their windshield wipers are turned on, Peterson said.

"It's the very beginning of the rainy season," he said. "It is not usual to see these systems weaker and weaker during the first rainfall."

Sarah Ravani is a writer at the San Francisco Chronicle. Email: [email protected] Twitter: @SarRavani


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