Alert archive / California / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 9, NWS Sacramento, CA

August 17, 2024Shasta County, Tehama County, California

NWS Sacramento, CA issued this severe thunderstorm warning at Aug 17, 2024, 4:07 PM PDT for Shasta County, Tehama County, California. It was in force for 38 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
Aug 17, 2024, 4:07 PM PDT (23:07 UTC)
Expired
Aug 17, 2024, 4:45 PM PDT
In force
38 min
Issued by
NWS Sacramento, CA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Shasta County, CA, Tehama County, CA

The radar

The Beale AFB radar (KBBX), 114 km from the middle of the area, began a volume at 23:09 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 11.1 hours before the alert went out and 221 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, Medford/Jackson, OR at 12:00Z on 2024-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Medford/Jackson, OR at 12:00Z on 2024-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1389 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Sacramento, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 2:08 PM PDTSpecial Weather StatementSTOShasta37 min
Aug 17, 2:52 PM PDTSpecial Weather StatementSTOShasta38 min
Aug 17, 3:20 PM PDTSpecial Weather StatementSTOTrinity25 min
Aug 17, 3:44 PM PDTSpecial Weather StatementSTOTrinity31 min
Aug 17, 3:49 PM PDTSpecial Weather StatementSTOShasta26 min
Aug 17, 3:55 PM PDTSpecial Weather StatementSTOTehama35 min
Aug 17, 4:15 PM PDTSpecial Weather StatementSTOShasta45 min
Aug 17, 4:28 PM PDTSpecial Weather StatementSTOShasta47 min
Aug 17, 4:29 PM PDTSpecial Weather StatementSTOShasta31 min
Aug 17, 4:43 PM PDTSevere Thunderstorm WarningSTOShasta47 min

Nearby

Severe Thunderstorm Warnings in California, 2024Every severe thunderstorm warning in 2024

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.