Alert archive / California / Frost Advisories in 2025
Frost Advisory 22, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this frost advisory at Feb 7, 2025, 12:25 AM PST for 10 counties in California. It took effect at Feb 8, 2025, 1:00 AM PST. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Feb 7, 2025, 12:25 AM PST (08:25 UTC)
- In effect from
- Feb 8, 2025, 1:00 AM PST
- Expired
- Feb 8, 2025, 9:00 AM PST
- In force
- 8 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 08:24 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 nearest sounding before it
Vandenberg AFB, CA (KVBG), launched 00:00Z, 8.4 hours before the alert went out and 339 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 61 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 517 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this frost advisory went out at Feb 6, 2:44 PM PST, 9 hours 41 minutes earlier.
Area forecast discussion, Feb 6, 2:44 PM PST, 9 hours 41 minutes before
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</html>The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 6, 4:40 PM PST | Areal Flood Advisory | MTR | Monterey | 5 hr |
| Feb 6, 8:37 PM PST | Small Craft Advisory | MTR | 5 days | |
| Feb 6, 9:55 PM PST | Areal Flood Advisory | MTR | Sonoma | 2 hr |
| Feb 6, 11:55 PM PST | Areal Flood Advisory | MTR | Sonoma | 36 hr |
| Feb 7, 12:25 AM PST | Freeze Warning | MTR | Marin, Monterey, Napa, San Benito, Santa Clara, Sonoma | 33 hr |
| Feb 7, 2:42 AM PST | Small Craft Advisory | MTR | 48 hr | |
| Feb 7, 11:51 AM PST | Areal Flood Advisory | MTR | San Mateo | 114 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.