Alert archive / California / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 18, NWS San Francisco Bay Area, CA

December 24, 2025Monterey County, California

NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Dec 24, 2025, 6:06 PM PST for Monterey County, California. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 24, 2025, 6:06 PM PST (02:06 UTC)
Expired
Dec 24, 2025, 6:30 PM PST
In force
24 min
Issued by
NWS San Francisco Bay Area, CA
Area
Storm-based polygon
Damage threat
Considerable
Hail
1.0 in
Wind
70.0 mph

County Monterey County, CA

The radar

The San Francisco radar (KMUX), 115 km from the middle of the area, began a volume at 02:05 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

Oakland, CA (KOAK), launched 00:00Z, 2.1 hours before the alert went out and 184 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.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 00:00Z on 2025-12-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 145 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 00:00Z on 2025-12-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
145 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1058 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Dec 24, 3:52 PM PST, 2 hours 14 minutes earlier.

Area forecast discussion, Dec 24, 3:52 PM PST, 2 hours 14 minutes before
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In the hours before

Special weather statement, Dec 24, 5:15 PM PST, 51 minutes before
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<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

IssuedProductOfficeCountiesLasted
Dec 24, 5:11 PM PSTSpecial Marine WarningMTR49 min
Dec 24, 5:15 PM PSTSpecial Weather StatementMTRAlameda30 min
Dec 24, 5:18 PM PSTSpecial Marine WarningMTR27 min
Dec 24, 5:45 PM PSTSpecial Marine WarningMTR30 min
Dec 24, 6:20 PM PSTSevere Thunderstorm Warning Considerable damage threatMTRMonterey16 min
Dec 24, 7:05 PM PSTSpecial Marine WarningMTR10 min
Dec 24, 7:39 PM PSTSpecial Weather StatementMTRSan Mateo36 min
Dec 24, 7:41 PM PSTSpecial Marine WarningMTR34 min
Dec 25, 12:11 AM PSTSpecial Marine WarningMTR34 min
Dec 25, 12:17 AM PSTAreal Flood AdvisoryMTRSan Mateo, Santa Clara, Santa Cruz8 hr
Dec 25, 12:59 AM PSTSpecial Marine WarningMTR31 min
Dec 25, 1:03 AM PSTAreal Flood AdvisoryMTRCity and County of San Francisco, San Mateo7 hr
Dec 25, 1:34 AM PSTSpecial Marine WarningMTR26 min
Dec 25, 1:54 AM PSTSpecial Marine WarningMTR36 min
Dec 25, 2:00 AM PSTSpecial Marine WarningMTR15 min
Dec 25, 2:01 AM PSTFlash Flood Warning Considerable damage threatMTRSan Mateo3 hr
Dec 25, 2:19 AM PSTSevere Thunderstorm Warning Considerable damage threatMTRCity and County of San Francisco, San Mateo26 min
Dec 25, 2:48 AM PSTAreal Flood AdvisoryMTRAlameda, Contra Costa, Santa Clara5 hr
Dec 25, 2:48 AM PSTSevere Thunderstorm Warning Considerable damage threatMTRSan Mateo, Santa Cruz27 min
Dec 25, 2:56 AM PSTFlash Flood Warning Considerable damage threatMTRCity and County of San Francisco, San Mateo2 hr
Dec 25, 3:01 AM PSTFlash Flood WarningMTRAlameda, Contra Costa3 hr
Dec 25, 3:11 AM PSTFlash Flood Warning Considerable damage threatMTRSan Mateo, Santa Clara3 hr
Dec 25, 3:12 AM PSTSevere Thunderstorm Warning Considerable damage threatMTRAlameda, San Mateo, Santa Clara, Santa Cruz33 min
Dec 25, 3:17 AM PSTAreal Flood AdvisoryMTRSanta Cruz4 hr
Dec 25, 3:20 AM PSTAreal Flood AdvisoryMTRNapa5 hr
Dec 25, 4:46 AM PSTAreal Flood AdvisoryMTRMonterey3 hr
Dec 25, 6:02 AM PSTAreal Flood AdvisoryMTRSanta Clara3 hr
Dec 25, 7:08 AM PSTSpecial Weather StatementMTRSonoma37 min
Dec 25, 7:53 AM PSTSpecial Weather StatementMTRSonoma37 min
Dec 25, 7:56 AM PSTSpecial Weather StatementMTRNapa, Sonoma34 min
Dec 25, 9:13 AM PSTSpecial Weather StatementMTRSonoma47 min
Dec 25, 10:32 AM PSTSpecial Weather StatementMTRMarin43 min
Dec 25, 10:39 AM PSTSpecial Weather StatementMTRSonoma36 min
Dec 25, 11:16 AM PSTSpecial Marine WarningMTR29 min
Dec 25, 11:41 AM PSTSpecial Marine WarningMTR34 min
Dec 25, 12:00 PM PSTSpecial Marine WarningMTR45 min
Dec 25, 12:09 PM PSTSpecial Marine WarningMTR31 min
Dec 25, 12:19 PM PSTTornado WarningMTRSanta Cruz31 min
Dec 25, 12:34 PM PSTSpecial Marine WarningMTR56 min
Dec 25, 12:58 PM PSTSpecial Marine WarningMTR62 min
Dec 25, 1:25 PM PSTSpecial Weather StatementMTRSanta Cruz35 min
Dec 25, 2:47 PM PSTHigh Surf AdvisoryMTRMarin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma31 hr
Dec 25, 3:29 PM PSTSpecial Marine WarningMTR61 min
Dec 25, 3:33 PM PSTSpecial Marine WarningMTR42 min

Nearby

Severe Thunderstorm Warnings in California, 2025Every severe thunderstorm warning 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.