Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 122, NWS Birmingham, AL

April 3, 1999Limestone County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 3, 1999, 11:30 PM CST for Limestone County, Alabama. It was in force for 50 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
Apr 3, 1999, 11:30 PM CST (05:30 UTC)
Expired
Apr 4, 1999, 12:20 AM CST
In force
50 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Limestone County, AL

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 3, 10:15 PM CSTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 5.5 hours before the alert went out and 271 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, Little Rock, AR at 00:00Z on 1999-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 25 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 00:00Z on 1999-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -231 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
25 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
724 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-231 m²/s²
0-3 km storm-relative helicity
-324 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

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
Apr 3, 10:03 PM CSTSevere Thunderstorm WarningBMXLauderdale47 min
Apr 3, 10:39 PM CSTSevere Thunderstorm WarningBMXColbert, Franklin46 min
Apr 3, 11:00 PM CSTSevere Thunderstorm WarningBMXLauderdale45 min
Apr 3, 11:13 PM CSTSevere Thunderstorm WarningBMXLawrence47 min
Apr 3, 11:15 PM CSTSevere Thunderstorm WarningBMXLamar, Marion50 min
Apr 3, 11:25 PM CSTSevere Thunderstorm WarningBMXWinston50 min
Apr 3, 11:32 PM CSTSevere Thunderstorm WarningBMXFayette48 min
Apr 3, 11:45 PM CSTSevere Thunderstorm WarningBMXMorgan50 min
Apr 4, 12:07 AM CSTSevere Thunderstorm WarningBMXMadison33 min
Apr 4, 12:10 AM CSTSevere Thunderstorm WarningBMXCullman45 min
Apr 4, 12:16 AM CSTSevere Thunderstorm WarningBMXWinston34 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.