Alert archive / South Carolina / Tornado Warnings in 1999

Tornado Warning 9, NWS Columbia, SC

April 24, 1999Aiken County, South Carolina

NWS Columbia, SC issued this tornado warning at Apr 24, 1999, 5:20 PM EDT for Aiken County, South Carolina. It was in force for 25 min. 2 reports 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
Apr 24, 1999, 5:20 PM EDT (21:20 UTC)
Expired
Apr 24, 1999, 5:45 PM EDT
In force
25 min
Issued by
NWS Columbia, SC
Area
Whole counties

County Aiken County, SC

What was reported inside it

TimeReportWhereRemark
Apr 24, 5:20 PM EDTHail 2.5Monetta, SCA supercell storm moved southeast through Aiken county and produced hail to tennis ball size. Damage was done to homes, buildings, vehicles, and crops.
Apr 24, 5:30 PM EDTThunderstorm Wind 50Monetta, SCNWS Survey found scattered trees down along highway 39.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 24, 4:30 PM EDTTornado WatchSPC6 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 9.3 hours before the alert went out and 168 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

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCAE 242119 RRA
TORCAE
SCC003-242145-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
520 PM EDT SAT APR 24 1999

THE NATIONAL WEATHER SERVICE IN COLUMBIA SC HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN AIKEN COUNTY IN SOUTH CAROLINA

* UNTIL 545 PM EDT 

* AT 520 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A TORNADO IN THE MONETTA AREA MOVING SOUTHEAST AT 20 MPH.

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 3:59 PM EDTSevere Thunderstorm WarningCAEBamberg31 min
Apr 24, 4:25 PM EDTTornado WarningCAENewberry65 min
Apr 24, 4:39 PM EDTTornado WarningCAESaluda66 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

Nearby

Tornado Warnings in South Carolina, 1999Every tornado warning in 1999Tornadoes 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.