Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 422, NWS Birmingham, AL

July 24, 1999Morgan County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 24, 1999, 6:12 PM CDT for Morgan County, Alabama. It was in force for 48 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 24, 1999, 6:12 PM CDT (23:12 UTC)
Expired
Jul 24, 1999, 7:00 PM CDT
In force
48 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Morgan County, AL

What was reported inside it

TimeReportWhereRemark
Jul 24, 6:30 PM CDTThunderstorm Wind 50Hartselle, ALTrees were blown down near Hartselle.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.2 hours before the alert went out and 142 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, Birmingham, AL at 12:00Z on 1999-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1186 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, Birmingham, AL at 12:00Z on 1999-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
1186 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
885 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
13 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 23, 7:36 PM CDTSevere Thunderstorm WarningBMXBarbour34 min
Jul 24, 12:42 AM CDTSevere Thunderstorm WarningBMXShelby33 min
Jul 24, 3:17 PM CDTSevere Thunderstorm WarningBMXRandolph33 min
Jul 24, 4:01 PM CDTSevere Thunderstorm WarningBMXJefferson49 min
Jul 24, 5:30 PM CDTSevere Thunderstorm WarningBMXBlount35 min
Jul 24, 5:56 PM CDTSevere Thunderstorm WarningBMXMadison34 min
Jul 24, 6:03 PM CDTSevere Thunderstorm WarningBMXCoosa32 min
Jul 24, 6:33 PM CDTSevere Thunderstorm WarningBMXCoosa32 min
Jul 24, 6:47 PM CDTSevere Thunderstorm WarningBMXLawrence48 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.