Alert archive / California / Special Weather Statements in 2025

Special Weather Statement, NWS San Francisco Bay Area, CA

April 1, 2025Santa Clara County, California

NWS San Francisco Bay Area, CA issued this special weather statement at Apr 1, 2025, 4:21 PM PDT for Santa Clara 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 outline as issued.

The facts

Issued
Apr 1, 2025, 4:21 PM PDT (23:21 UTC)
Expired
Apr 1, 2025, 4:45 PM PDT
In force
24 min
Issued by
NWS San Francisco Bay Area, CA
Hail
0.25 in
Wind
30

County Santa Clara County, CA

The radar

The San Francisco radar (KMUX), 43 km from the middle of the area, began a volume at 23:19 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 12:00Z, 11.4 hours before the alert went out and 110 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 12:00Z on 2025-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 joules per kilogram.LCLEL10008507005003002001001 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 12:00Z on 2025-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 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
33 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
689 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 1, 8:29 AM PDTSpecial Weather StatementMTRSanta Cruz31 min
Apr 1, 8:56 AM PDTSpecial Weather StatementMTRSanta Cruz34 min
Apr 1, 9:39 AM PDTSpecial Weather StatementMTRSanta Cruz36 min
Apr 1, 10:10 AM PDTSpecial Weather StatementMTRSanta Cruz35 min
Apr 1, 12:50 PM PDTSpecial Weather StatementMTRSan Benito25 min
Apr 1, 1:31 PM PDTSpecial Weather StatementMTRSan Mateo29 min
Apr 1, 2:48 PM PDTSpecial Weather StatementMTRSan Mateo27 min
Apr 1, 3:23 PM PDTSpecial Weather StatementMTRSanta Clara22 min
Apr 1, 3:36 PM PDTSpecial Weather StatementMTRSan Mateo24 min
Apr 1, 3:53 PM PDTSpecial Weather StatementMTRSan Mateo22 min
Apr 1, 4:50 PM PDTSpecial Weather StatementMTRSanta Cruz25 min

Nearby

Special Weather Statements in California, 2025Every special weather statement 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.