Alert archive / Alabama / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 107, NWS Huntsville, AL

July 20, 2015Lauderdale County, Limestone County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 20, 2015, 6:10 PM CDT for Lauderdale County, Limestone County, Alabama. It was in force for 35 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
Jul 20, 2015, 6:10 PM CDT (23:10 UTC)
Expired
Jul 20, 2015, 6:45 PM CDT
In force
35 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Lauderdale County, AL, Limestone County, AL

The radar

The Northeast Alabama radar (KHTX), 113 km from the middle of the area, began a volume at 23:14 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

Nashville Metro, TN (KBNA), launched 12:00Z, 11.2 hours before the alert went out and 156 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, Nashville Metro, TN at 12:00Z on 2015-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1312 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, Nashville Metro, TN at 12:00Z on 2015-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 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
1312 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1151 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
-58 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
Jul 20, 2:47 PM CDTSpecial Weather StatementHUNJackson43 min
Jul 20, 3:28 PM CDTSpecial Weather StatementHUNJackson47 min
Jul 20, 3:40 PM CDTSpecial Weather StatementHUNMadison50 min
Jul 20, 3:50 PM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson40 min
Jul 20, 4:30 PM CDTSpecial Weather StatementHUNDeKalb45 min
Jul 20, 5:25 PM CDTSpecial Weather StatementHUNLimestone35 min
Jul 20, 5:44 PM CDTSevere Thunderstorm WarningHUNLauderdale, Limestone31 min
Jul 20, 2:02 PM CDTSpecial Weather StatementHUNFranklin43 min
Jul 20, 2:07 PM CDTSpecial Weather StatementHUNFranklin38 min
Jul 20, 2:44 PM CDTSpecial Weather StatementHUNFranklin46 min
Jul 20, 4:25 PM CDTSpecial Weather StatementHUNLincoln50 min
Jul 20, 4:43 PM CDTSpecial Weather StatementHUNFranklin47 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2015Every severe thunderstorm warning in 2015

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.