Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 498, NWS Birmingham, AL

August 20, 1999Muscogee County, Georgia

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 20, 1999, 4:36 PM EDT for Muscogee County, Georgia. It was in force for 49 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
Aug 20, 1999, 4:36 PM EDT (20:36 UTC)
Expired
Aug 20, 1999, 5:25 PM EDT
In force
49 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Muscogee County, GA

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.6 hours before the alert went out and 102 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 1999-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1278 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, Peachtre/Fal Fld, GA at 12:00Z on 1999-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 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
1278 J/kg
Mixed-layer CIN
-137 J/kg
Mixed-layer LCL
1226 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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
Aug 19, 8:43 PM EDTSevere Thunderstorm WarningBMXEtowah47 min
Aug 19, 10:27 PM EDTSevere Thunderstorm WarningBMXMarshall33 min
Aug 20, 3:21 PM EDTSevere Thunderstorm WarningBMXRandolph34 min
Aug 20, 4:54 PM EDTSevere Thunderstorm WarningBMXRussell51 min
Aug 20, 5:24 PM EDTSevere Thunderstorm WarningBMXMontgomery31 min
Aug 20, 5:31 PM EDTSevere Thunderstorm WarningBMXMacon34 min
Aug 20, 5:46 PM EDTSevere Thunderstorm WarningBMXLowndes34 min
Aug 20, 6:35 PM EDTFlash Flood WarningBMXMacon2 hr
Aug 20, 6:56 PM EDTSevere Thunderstorm WarningBMXElmore, Montgomery34 min
Aug 20, 7:11 PM EDTSevere Thunderstorm WarningBMXBullock34 min
Aug 20, 3:36 PM EDTSevere Thunderstorm WarningBMXMuscogee29 min
Aug 20, 4:03 PM EDTSevere Thunderstorm WarningBMXMuscogee32 min

Nearby

Severe Thunderstorm Warnings in Georgia, 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.