Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 182, NWS Birmingham, AL

May 4, 1999Hale County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at May 4, 1999, 2:12 PM CDT for Hale 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
May 4, 1999, 2:12 PM CDT (19:12 UTC)
Expired
May 4, 1999, 3:00 PM CDT
In force
48 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Hale County, AL

The radar

The Birmingham radar (KBMX), 92 km from the middle of the area, began a volume at 19:16 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 nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 7.2 hours before the alert went out and 235 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, Jackson, MS at 12:00Z on 1999-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 111 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, Jackson, MS at 12:00Z on 1999-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 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
111 J/kg
Mixed-layer CIN
-567 J/kg
Mixed-layer LCL
807 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
155 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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
May 4, 12:13 PM CDTSevere Thunderstorm WarningBMXSumter47 min
May 4, 1:07 PM CDTSevere Thunderstorm WarningBMXSumter33 min
May 4, 1:17 PM CDTSevere Thunderstorm WarningBMXGreene48 min
May 4, 3:04 PM CDTSevere Thunderstorm WarningBMXDallas, Perry31 min
May 4, 3:21 PM CDTSevere Thunderstorm WarningBMXMarengo34 min
May 4, 3:36 PM CDTSevere Thunderstorm WarningBMXDallas49 min
May 4, 6:30 PM CDTSevere Thunderstorm WarningBMXBibb35 min
May 4, 6:41 PM CDTSevere Thunderstorm WarningBMXJefferson, Shelby34 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.