Alert archive / California / Extreme Cold Warnings in 2026
Extreme Cold Warning 4, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this extreme cold warning at Feb 17, 2026, 2:59 AM PST for Monterey County, San Benito County, Santa Clara County, California. It took effect at Feb 18, 2026, 12:00 AM PST. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 17, 2026, 2:59 AM PST (10:59 UTC)
- In effect from
- Feb 18, 2026, 12:00 AM PST
- Expired
- Feb 18, 2026, 9:00 AM PST
- In force
- 9 hr
- Issued by
- NWS San Francisco Bay Area, CA
Counties Monterey County, CA, San Benito County, CA, Santa Clara County, CA
The radar
The San Francisco radar (KMUX), 70 km from the middle of the area, began a volume at 11:00 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, 11.0 hours before the alert went out and 232 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
- 134 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 542 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -35 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
What forecasters said that day
The local office's own words before this extreme cold warning 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 extreme cold warning went out at Feb 16, 10:01 PM PST, 4 hours 58 minutes earlier.
Area forecast discussion, Feb 16, 10:01 PM PST, 4 hours 58 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 16, 8:32 PM PST | Gale Warning | MTR | 36 hr | |
| Feb 17, 2:56 AM PST | Cold Weather Advisory | MTR | Marin, Monterey, Napa, San Mateo, Santa Clara, Santa Cruz and 1 more | 30 hr |
| Feb 17, 7:10 AM PST | Areal Flood Advisory | MTR | Marin, Napa, Sonoma | 3 hr |
| Feb 17, 8:26 AM PST | Special Weather Statement | MTR | Contra Costa | 34 min |
| Feb 17, 9:53 AM PST | Areal Flood Advisory | MTR | Alameda, Contra Costa, City and County of San Francisco, San Mateo, Santa Clara, Santa Cruz | 9 hr |
| Feb 17, 11:08 AM PST | Special Weather Statement | MTR | Santa Clara | 52 min |
| Feb 17, 1:18 PM PST | Special Weather Statement | MTR | Monterey | 27 min |
| Feb 17, 1:30 PM PST | Areal Flood Advisory | MTR | Monterey | 7 hr |
| Feb 17, 1:50 PM PST | Special Weather Statement | MTR | Monterey | 25 min |
| Feb 17, 2:14 PM PST | Special Weather Statement | MTR | Monterey | 31 min |
| Feb 17, 2:30 PM PST | Special Marine Warning | MTR | 30 min | |
| Feb 17, 2:42 PM PST | Special Weather Statement | MTR | Monterey | 33 min |
Nearby
Extreme Cold Warnings in California, 2026Every extreme cold warning in 2026
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.