Alert archive / California / Frost Advisories in 2025

Frost Advisory 12, NWS San Francisco Bay Area, CA

January 21, 202510 counties in California

NWS San Francisco Bay Area, CA issued this frost advisory at Jan 21, 2025, 11:26 AM PST for 10 counties in California. It took effect at Jan 22, 2025, 12:00 AM PST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Jan 21, 2025, 11:26 AM PST (19:26 UTC)
In effect from
Jan 22, 2025, 12:00 AM PST
Expired
Jan 22, 2025, 10:00 AM PST
In force
10 hr
Issued by
NWS San Francisco Bay Area, CA

Counties Alameda County, CA, Contra Costa County, CA, Marin County, CA, Monterey County, CA, Napa County, CA, San Benito County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA

The radar

The San Francisco radar (KMUX), 42 km from the middle of the area, began a volume at 19:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 21, 11:26 AM PSTFreeze WarningMTRMarin, Monterey, Napa, Sonoma23 hr

Nearby

Frost Advisories in California, 2025Every frost advisory in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.