Night showers in the bay area; Sunday Night Atmospheric River Moves Northwest – CBS San Francisco
SAN FRANCISCO (CBS SF) – A rapidly moving cold front triggered downpours in the San Francisco Bay Area early Thursday.
While the rain provided further relief from the extreme drought conditions, a more powerful atmospheric river on the weekend changed course, missing northern California and heading northwest.
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“Rainfall amounts have been pretty decent over North Bay with a few hundredths to a few tenths,” the National Weather Service said. “The highest amounts are on coastal mountains like Mount Tam which approaches three-quarters of an inch.”
“The morning commute will not be a total failure,” weather forecasters said. “Some wet roads will be possible. The showers will have ended on Thursday afternoon.
Initially, forecasters believed a Category 1 atmospheric river would flow into the Bay Area on Sunday evening, bringing more intense precipitation.
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Forecasters reversed that prediction on Thursday morning as the powerful plume of humidity in the Pacific began to move north.
“The latest atmospheric fluvial orientation has retreated on potential for Monday and Tuesday,” forecasters said. “Now it looks like California is still receiving a surge in humidity, but the stronger previously announced surge has shifted north. Deterministic models also retreated on precipitation Monday / Tuesday.”
Meanwhile, federal drought officials released their latest weekly update Thursday morning showing improvements in parched conditions in the Bay Area.
Mendocino, Sonoma, Marin, San Francisco, San Mateo, Santa Clara and Santa Cruz counties were all in extreme conditions.
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While the counties of Napa, Contra Costa and Napa remain locked in exceptional drought conditions.