Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 77, NWS Birmingham, AL

February 27, 1999Jackson County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Feb 27, 1999, 7:33 PM CST for Jackson County, Alabama. It was in force for 47 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
Feb 27, 1999, 7:33 PM CST (01:33 UTC)
Expired
Feb 27, 1999, 8:20 PM CST
In force
47 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Jackson County, AL

The radar

The Northeast Alabama radar (KHTX), 19 km from the middle of the area, began a volume at 01:33 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Feb 27, 5:30 PM CSTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 1.6 hours before the alert went out and 160 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 00:00Z on 1999-02-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 523 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 00:00Z on 1999-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 265 square meters per square second.1939587897117Sfc1 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
523 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
501 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
265 m²/s²
0-3 km storm-relative helicity
252 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 27, 6:00 PM CSTSevere Thunderstorm WarningBMXPickens, Tuscaloosa65 min
Feb 27, 6:03 PM CSTSevere Thunderstorm WarningBMXLauderdale, Lawrence47 min
Feb 27, 6:13 PM CSTSevere Thunderstorm WarningBMXLimestone47 min
Feb 27, 6:16 PM CSTSevere Thunderstorm WarningBMXWalker49 min
Feb 27, 6:25 PM CSTSevere Thunderstorm WarningBMXGreene, Hale, Marengo50 min
Feb 27, 6:31 PM CSTSevere Thunderstorm WarningBMXMadison49 min
Feb 27, 6:37 PM CSTSevere Thunderstorm WarningBMXJefferson48 min
Feb 27, 6:49 PM CSTSevere Thunderstorm WarningBMXBibb, Perry46 min
Feb 27, 6:58 PM CSTSevere Thunderstorm WarningBMXBlount47 min
Feb 27, 7:06 PM CSTSevere Thunderstorm WarningBMXTuscaloosa19 min
Feb 27, 7:10 PM CSTSevere Thunderstorm WarningBMXSt. Clair50 min
Feb 27, 7:15 PM CSTSevere Thunderstorm WarningBMXChilton, Shelby65 min
Feb 27, 7:25 PM CSTSevere Thunderstorm WarningBMXEtowah50 min
Feb 27, 7:40 PM CSTSevere Thunderstorm WarningBMXCalhoun, Talladega65 min
Feb 27, 7:42 PM CSTSevere Thunderstorm WarningBMXCoosa63 min
Feb 27, 7:58 PM CSTSevere Thunderstorm WarningBMXCherokee, DeKalb47 min
Feb 27, 8:03 PM CSTSevere Thunderstorm WarningBMXAutauga, Elmore62 min
Feb 27, 8:03 PM CSTSevere Thunderstorm WarningBMXClay, Cleburne62 min
Feb 27, 8:26 PM CSTSevere Thunderstorm WarningBMXRandolph, Tallapoosa49 min
Feb 27, 8:47 PM CSTSevere Thunderstorm WarningBMXLowndes, Montgomery63 min
Feb 27, 8:50 PM CSTSevere Thunderstorm WarningBMXChambers, Lee, Macon65 min
Feb 27, 9:20 PM CSTSevere Thunderstorm WarningBMXRandolph20 min
Feb 27, 9:40 PM CSTSevere Thunderstorm WarningBMXRussell50 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1999Every severe thunderstorm warning in 1999

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.