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A cold front originating from the Gulf of Alaska dove into Northern
California on Friday night and dumped rain on Saturday. The storm ushered
a mass of cold air into the state and temperatures are expected to drop to below-normal levels Saturday through Monday.
�Impressive late-season low pressure system will bring [a] short, sharp
hit of cold rain (and mountain snow above ~4k ft) this [weekend],� UCLA
climate scientist Daniel Swain wrote on Twitter. �Nearly everywhere in
NorCal should see good soaking, [with] lighter showers into SoCal. This
will be quite a cold system by May standards.�
Temperatures across California on Saturday through Monday are expected to
be 5 to 20 degrees below normal.
Far Northern California, including Del Norte and Humboldt counties, saw rainfall rates up to 0.5 inch per hour overnight, the weather service�s
Eureka office said. Snow levels in the coastal range got as low as 2,500
feet with a winter weather advisory in effect through 11 a.m. Saturday.
Inland valleys in the area stretching between the California-Oregon border
and Lake County could see overnight lows that are near freezing to
freezing on Saturday and Sunday nights.
The Bay Area received a soaking Saturday morning. On average, downtown San Francisco sees 0.70 inches of rain in the month of May. As of 11 a.m., the gauge in downtown measured 0.59 inches with the rain still dumping. The
weather service predicted the city would record 0.5 to 1 inch of rain
today. A flood advisory was issued for a portion of the San Francisco
Peninsula through 12:45 p.m., warning of minor flooding on highways.
Santa Rosa had measured 0.76 inch of rain, Oakland 0.37 and San Jose 0.09
as of 11:30 a.m., the weather service said.
�By early Saturday evening, the rains should be starting to wrap up. It�s pretty much going to be a one-day event,� Alexis Clouser, a forecaster
with the weather service�s Bay Area office, said. Sunday is expected to be
dry in the Bay Area.
Rain is likely to fall in most of the Central Valley at some point on
Saturday or Sunday, with the northern half of the Central Valley expected
to see more rain than the southern. Sacramento, Stockton, Modesto and
Fresno are forecast to pick up half an inch to an inch of rain, while
Visalia could record 0.2 to 0.5 inch and Bakersfield up to a tenth of an
inch.
Following heavy snow and multiple spinouts, Caltrans District 3 turned
traffic around in both directions on Interstate 80 near Lake Tahoe
Saturday afternoon. By Sunday morning, traffic had reopened to vehicles
with chains or snow tires on all four tires.
The weather service is forecasting that Lassen Volcanic National Park will record 18 to 24 inches, Donner Pass 8 to 12 inches, Echo Summit 3 to 4
inches, Ebbetts and Sonora passes 12 to 18 inches, Yosemite Valley up to 1
inch and the Tioga Pass area 12 to 24 inches.
The storm is expected to weaken as it pushes into Central and Southern California, with this part of the state seeing much lower rainfall totals
than those in Northern California. Light rain was falling in Monterey
County at 9 a.m. and was expected to push into San Luis Obispo County by
the afternoon, the weather service said.
https://www.sfgate.com/weather/article/dumping-rain-snow-northern- california-19439468.php
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