Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 98, NWS Huntsville, AL

August 19, 2020Jackson County, Madison County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Aug 19, 2020, 3:34 PM CDT for Jackson County, Madison County, Alabama. It was in force for 26 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 19, 2020, 3:34 PM CDT (20:34 UTC)
Expired
Aug 19, 2020, 4:00 PM CDT
In force
26 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Jackson County, AL, Madison County, AL

The radar

The Northeast Alabama radar (KHTX), 25 km from the middle of the area, began a volume at 20:34 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

Birmingham, AL (KBMX), launched 12:00Z, 8.6 hours before the alert went out and 183 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, Birmingham, AL at 12:00Z on 2020-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 56 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, Birmingham, AL at 12:00Z on 2020-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939Sfc1 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
56 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
1738 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 19, 12:58 PM CDTSpecial Weather StatementHUNDeKalb47 min
Aug 19, 1:17 PM CDTSevere Thunderstorm WarningHUNDeKalb15 min
Aug 19, 1:56 PM CDTSpecial Weather StatementHUNDeKalb49 min
Aug 19, 1:59 PM CDTSpecial Weather StatementHUNDeKalb46 min
Aug 19, 2:23 PM CDTSpecial Weather StatementHUNCullman52 min
Aug 19, 2:34 PM CDTSpecial Weather StatementHUNJackson41 min
Aug 19, 3:16 PM CDTSpecial Weather StatementHUNJackson44 min
Aug 19, 4:39 PM CDTSpecial Weather StatementHUNCullman36 min
Aug 19, 4:56 PM CDTSpecial Weather StatementHUNMorgan49 min
Aug 19, 5:02 PM CDTSevere Thunderstorm WarningHUNCullman, Morgan28 min
Aug 19, 5:29 PM CDTSpecial Weather StatementHUNMorgan46 min
Aug 19, 6:07 PM CDTSpecial Weather StatementHUNLawrence53 min
Aug 19, 6:14 PM CDTSpecial Weather StatementHUNMorgan46 min
Aug 19, 4:00 PM CDTSpecial Weather StatementHUNFranklin45 min
Aug 19, 4:07 PM CDTSpecial Weather StatementHUNFranklin38 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2020Every severe thunderstorm warning in 2020

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.