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2/3/2025
WT Staff
Got water questions? Give us a call at 877-52-WATER (877-529-2837), or email us at info@watertoday.ca
February 3, 2025 941 am PST
NWS San Francisco: flood watch in effect 4pm Monday
Hazardous Weather Statement issued by NWS San Francisco 849 am Mon Feb 3
FLOOD WATCH REMAINS IN EFFECT FROM 4 PM PST THIS AFTERNOON THROUGH LATE TUESDAY NIGHT...
Flooding caused by excessive rainfall continues to be possible for Sonoma, Napa, Marin, San Francisco, San Mateo, Contra Costa, Alameda, Santa Clara, Santa Cruz, San Benito, and Monterey
Counties.
Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas.
Initial rain over the past few days has helped to saturate soils and prime portions of the Bay Area for increased flooding potential as our next AR moves inland. The next round of moderate to heavy rain is expected Monday into Tuesday which will bring additional flooding concerns to the
Central Coast where the heaviest rainfall is likely within the Santa Cruz Mountains and the Santa Lucia Range.
See NWS flood safety information, here.
Monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Impacting San Francisco-Marin Coastal Range-Sonoma Coastal Range-North Bay
Interior Mountains-Coastal North Bay Including Point Reyes
National Seashore-North Bay Interior Valleys-San Francisco Bay
Shoreline-San Francisco Peninsula Coast-East Bay Interior Valleys-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Eastern Santa Clara Hills-East Bay Hills-Southern Salinas
Valley/Arroyo Seco and Lake San Antonio-Santa Lucia Mountains and
Los Padres National Forest-Mountains of San Benito County And
Interior Monterey County including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
Including the cities of Seaside, San Francisco, Fremont,
Petaluma, Marina, Daly City, Walnut Creek, San Ramon, Scotts
Valley, Pleasanton, Pittsburg, Boulder Creek, Monterey,
Greenfield, San Jose, Berkeley, Novato, Live Oak, Woodacre,
Antioch, Pacifica, Watsonville, Santa Rosa, King City, Angwin,
Sausalito, Concord, Livermore, Blackhawk, Napa, San Rafael,
Rohnert Park, Salinas, Cordoza Ridge, Day Valley,
Tamalpais-Homestead, Oakland, South Santa Rosa, Hayward,
Lagunitas-Forest Knolls, and Santa Cruz
Streamflow Situation from the network of US Geological Survey river monitoring stations in California
Visalia Municipal Airport is clear and 53 degrees, becoming cloudy with a daytime high up to 67F Monday. Raining and windy today in San Francisco, under a wind advisory and flood watch, currently 57 degrees, not to get much warmer, the high just 60. Up to a quarter inch of rain expected through Monday with wind increasing to 25 to 30 mph by afternoon, gusts as high as 37 mph. Los Angeles is recovering from a dense fog overnight, this was expected to burn off by 10 am. The Air Quality alert is back on for the South Coast Air Quality Management District. San Diego under dense fog and 54 degrees, high today 68. The fog is expected to dissipate within the hour, clearing by 10 am.
Northern streamflows continue to elevate impacting the North Coast and northwest portion of the Central Valley watershed, down into San Francisco watershed. Cow Creek rose sharply overnight, seven feet over flood stage at peak flow just after midnight. The water level is coming down, three and a half feet over the channel near Millville in the Upper Central Valley basin. Mark West Creek began flooding just after 5 am near Mirabel Heights, still rising. Colgan Creek reached moderate flood stage briefly yesterday, just back inside the channel as of 8 am this morning near Sebastopol. Monitoring stations at the 99th percentile extreme high flows are shown on the front page map in blue, the flood sites in black. Enable the watershed layer with directional arrows to follow the water impact zone relative to hazardous materials spills, marked in pink.
Central coast water levels remain below normal to much below seasonal normal, possibly owing to controlled releases under the State water management plan. Los Angeles watershed continues with seasonal normal water levels as the risk for mudslides continues, see local road closures, here.
San Diego watershed continues with a mix of normal to much below normal flows. Interior Lahontan and Colorado River watersheds remain mostly below normal, moderate drought continues in central San Bernardino County with adjacent area to the north rated below normal (the southern Lahontan drainage basin) and below normal to the south, Colorado River basin.
Safe Drinking Water Advisories
The WTCAL.us Serious Violator list is out, the latest quarterly records audit from the US EPA has California drinking water facilities at 93.5% compliance with the Safe Drinking Water Act. Twenty-four of 7417 licensed and active drinking water facilities in California have significant violations in the latest audit, up five from the previous reporting.
See the January 2025 WTCAL.us Serious Violator List, here.
Bottled Water Distribution
Packaged drinking water is available for residents of Los Angeles County areas still under "Do not use" orders.
See Los Angeles County list of the drinking water notices, here. Scroll down to Water Alerts.
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