Alert archive / California / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 15, NWS Sacramento, CA

August 9, 2019Shasta County, Tehama County, California

NWS Sacramento, CA issued this severe thunderstorm warning at Aug 9, 2019, 11:56 PM PDT for Shasta County, Tehama County, California. It was in force for 49 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 9, 2019, 11:56 PM PDT (06:56 UTC)
Expired
Aug 10, 2019, 12:45 AM PDT
In force
49 min
Issued by
NWS Sacramento, CA
Area
Storm-based polygon
Hail
1.25 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 06:58 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 00:00Z, 6.9 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 00:00Z on 2019-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 20 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, Medford/Jackson, OR at 00:00Z on 2019-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -72 square meters per square second.193958Sfc1 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
20 J/kg
Mixed-layer CIN
-238 J/kg
Mixed-layer LCL
1404 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
-72 m²/s²
0-3 km storm-relative helicity
-76 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 11:45 PM PDTSpecial Weather StatementSTOTehama45 min
Aug 10, 12:45 AM PDTSpecial Weather StatementSTOShasta, Tehama45 min
Aug 10, 1:07 AM PDTSpecial Weather StatementSTOShasta38 min
Aug 10, 12:05 PM PDTSpecial Weather StatementSTOTehama40 min
Aug 10, 12:48 PM PDTSevere Thunderstorm WarningSTOButte, Glenn, Tehama44 min
Aug 10, 3:48 PM PDTSpecial Weather StatementSTOTehama42 min

Nearby

Severe Thunderstorm Warnings in California, 2019Every severe thunderstorm warning in 2019

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.