Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 439, NWS Birmingham, AL

July 29, 1999Jackson County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 29, 1999, 4:27 PM CDT for Jackson County, Alabama. It was in force for 48 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 29, 1999, 4:27 PM CDT (21:27 UTC)
Expired
Jul 29, 1999, 5:15 PM CDT
In force
48 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Jackson County, AL

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.5 hours before the alert went out and 209 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, Peachtre/Fal Fld, GA at 12:00Z on 1999-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 192 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 1999-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
192 J/kg
Mixed-layer CIN
-93 J/kg
Mixed-layer LCL
1285 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
60 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
Jul 29, 4:17 PM CDTSevere Thunderstorm WarningBMXLowndes, Montgomery33 min
Jul 29, 4:57 PM CDTSevere Thunderstorm WarningBMXDeKalb33 min
Jul 29, 5:20 PM CDTSevere Thunderstorm WarningBMXCalhoun, Cleburne35 min
Jul 29, 5:28 PM CDTSevere Thunderstorm WarningBMXMadison32 min
Jul 29, 5:55 PM CDTSevere Thunderstorm WarningBMXCalhoun50 min
Jul 29, 5:58 PM CDTSevere Thunderstorm WarningBMXMadison47 min
Jul 29, 6:15 PM CDTSevere Thunderstorm WarningBMXEtowah, Marshall50 min
Jul 29, 6:15 PM CDTSevere Thunderstorm WarningBMXMorgan50 min
Jul 29, 6:38 PM CDTSevere Thunderstorm WarningBMXColbert, Franklin47 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.