The southern periphery of a weak atmospheric river over the northwestern Pacific flooded Northern California on Saturday and Sunday, delivering light, constant rain in parts of the San Francisco Bay Area this morning.
“It brought a lot of moisture,” said Ryan Walbrun, a meteorologist with the National Weather Service. “It simply came to our notice then. San Francisco was supposed to get one-tenth of an inch, and so far it has received two-tenths. “
The North Bay received the most rainfall, with many meters recording more than half an inch. The total amount decreased south of the Golden Gate. Here are some of the total rainfall in the last 24 hours:
San Jose: 0.01 inches
La Honda: 0.04 inches
Auckland Airport: 0.17 inches
San Francisco: 0.20 inches
Half Moon Bay: 0.24 inches
North Auckland: 0.45 inches
Santa Rosa: 0.66 inches
Sonoma Airport: 0.70 inches
Mount Tamalpais: 2.76 inches
Walbrun said the rain in June was not completely out of the norm; the average rainfall for downtown San Francisco in June was 0.20, so with this system the city has reached its average monthly value.
“It’s great for the Marin reservoirs,” Walbrun said. “The danger of fire will be reduced in a few days. The places that saw a quarter to half an inch in the North Bay are enough to reduce the risk of fire at least temporarily.”
The rains are expected to ease on Sunday afternoon. Monday marks the beginning of a warming trend, with temperatures rising to the 1990s in the highlands and to the high 60s to the low 70s along the coast.
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