Alert archive / Alabama / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 42, NWS Huntsville, AL

May 5, 2018Limestone County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at May 5, 2018, 11:16 AM CDT for Limestone County, Alabama. It was in force for 29 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
May 5, 2018, 11:16 AM CDT (16:16 UTC)
Expired
May 5, 2018, 11:45 AM CDT
In force
29 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Limestone County, AL

The radar

The Northeast Alabama radar (KHTX), 83 km from the middle of the area, began a volume at 16:18 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, 4.3 hours before the alert went out and 151 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 2018-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 277 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 2018-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.19395878Sfc1 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
277 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
453 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.7

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
May 5, 3:57 AM CDTSpecial Weather StatementHUNColbert33 min
May 5, 4:26 AM CDTSpecial Weather StatementHUNLauderdale34 min
May 5, 4:56 AM CDTSpecial Weather StatementHUNLauderdale49 min
May 5, 6:28 AM CDTSpecial Weather StatementHUNFranklin32 min
May 5, 6:58 AM CDTSpecial Weather StatementHUNFranklin32 min
May 5, 10:03 AM CDTSpecial Weather StatementHUNFranklin42 min
May 5, 10:38 AM CDTSpecial Weather StatementHUNLimestone37 min
May 5, 11:57 AM CDTSpecial Weather StatementHUNMadison48 min
May 5, 1:52 PM CDTSpecial Weather StatementHUNMorgan38 min
May 5, 2:04 PM CDTSpecial Weather StatementHUNCullman26 min
May 5, 3:10 PM CDTSpecial Weather StatementHUNJackson, Marshall50 min
May 5, 3:53 PM CDTSpecial Weather StatementHUNDeKalb52 min
May 5, 6:00 PM CDTSpecial Weather StatementHUNColbert30 min
May 5, 6:18 PM CDTSpecial Weather StatementHUNFranklin27 min
May 5, 6:46 PM CDTSpecial Weather StatementHUNFranklin, Lawrence29 min
May 5, 11:11 AM CDTSpecial Weather StatementHUNLincoln49 min
May 5, 12:19 PM CDTSpecial Weather StatementHUNMoore26 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2018Every severe thunderstorm warning in 2018

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.