Alert archive / South Carolina / Tornado Watches in 1999

Tornado Watch 174

April 24, 199910 counties in Georgia; 16 counties in South Carolina

The Storm Prediction Center issued this tornado watch at Apr 24, 1999, 4:30 PM EDT for 10 counties in Georgia; 16 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 1999, 4:30 PM EDT (20:30 UTC)
Expired
Apr 24, 1999, 10:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 26 counties

Bulloch County, GA, Burke County, GA, Columbia County, GA, Effingham County, GA, Jenkins County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Screven County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Colleton County, SC, Edgefield County, SC, Greenwood County, SC, Hampton County, SC, Jasper County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Saluda County, SC

Warnings issued inside it

10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 24, 4:39 PM EDTTornado WarningCAESaluda66 min
Apr 24, 5:03 PM EDTSevere Thunderstorm WarningCHSColleton32 min
Apr 24, 5:20 PM EDTTornado WarningCAEAiken25 min
Apr 24, 5:39 PM EDTTornado WarningCAEAiken51 min
Apr 24, 6:03 PM EDTSevere Thunderstorm WarningCAEBarnwell42 min
Apr 24, 6:33 PM EDTSevere Thunderstorm WarningCAEBamberg42 min
Apr 24, 6:40 PM EDTSevere Thunderstorm WarningCHSAllendale40 min
Apr 24, 7:01 PM EDTSevere Thunderstorm WarningCHSHampton44 min
Apr 24, 7:06 PM EDTSevere Thunderstorm WarningCHSBulloch64 min
Apr 24, 7:26 PM EDTSevere Thunderstorm WarningCHSJasper44 min

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 8.5 hours before the alert went out and 172 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, Charleston AFB, SC at 12:00Z on 1999-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1256 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, Charleston AFB, SC at 12:00Z on 1999-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
1256 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
1157 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
125 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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 12:30 PM EDTSevere Thunderstorm WatchSPCHeard7 hr

Nearby

Tornado Watches in South Carolina, 1999Tornado Watches in Georgia, 1999Every tornado watch 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.