Alert archive / Alabama / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 631, NWS Birmingham, AL

July 31, 1998Colbert County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 31, 1998, 12:09 AM CDT for Colbert County, Alabama. It was in force for 51 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 31, 1998, 12:09 AM CDT (05:09 UTC)
Expired
Jul 31, 1998, 1:00 AM CDT
In force
51 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Colbert County, AL

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 5.2 hours before the alert went out and 193 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 1998-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1975 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 1998-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 square meters per square second.193958Sfc1 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
1975 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
923 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
217 m²/s²
Significant tornado parameter
1.4
Supercell composite
7.6

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 30, 11:25 PM CDTSevere Thunderstorm WarningBMXLauderdale, Limestone60 min
Jul 31, 1:16 PM CDTSevere Thunderstorm WarningBMXPike34 min
Jul 31, 1:27 PM CDTSevere Thunderstorm WarningBMXBarbour48 min
Jul 31, 5:00 PM CDTSevere Thunderstorm WarningBMXBibb, Shelby35 min
Jul 31, 5:51 PM CDTSevere Thunderstorm WarningBMXRandolph19 min
Jul 31, 6:11 PM CDTSevere Thunderstorm WarningBMXCoosa34 min
Jul 31, 6:43 PM CDTSevere Thunderstorm WarningBMXTallapoosa32 min
Jul 31, 3:25 PM CDTSevere Thunderstorm WarningBMXStewart35 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1998Every severe thunderstorm warning in 1998

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.