Alert archive / South Carolina / Tornado Warnings in 1999

Tornado Warning 21, NWS Charleston, SC

August 26, 1999Charleston County, South Carolina

NWS Charleston, SC issued this tornado warning at Aug 26, 1999, 9:21 AM EDT for Charleston County, South Carolina. It was in force for 29 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 26, 1999, 9:21 AM EDT (13:21 UTC)
Expired
Aug 26, 1999, 9:50 AM EDT
In force
29 min
Issued by
NWS Charleston, SC
Area
Whole counties

County Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 103 km from the middle of the area, began a volume at 13:23 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

Charleston AFB, SC (KCHS), launched 12:00Z, 1.4 hours before the alert went out and 18 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 1999-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3136 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 1999-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 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
3136 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
582 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

431 
WFUS1 KCHS 261321 RRA
TORCHS
SCC019-261350-

BULLETIN...EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
921 AM EDT THU AUG 26 1999

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN CHARLESTON COUNTY IN SOUTH CAROLINA.

* UNTIL 950 AM EDT.

* AT 916 AM... THE PUBLIC REPORTED A FUNNEL CLOUD NEAR THE ISLE
  OF PALMS CONNECTOR IN MT PLEASANT. ADDITIONAL FUNNEL CLOUDS MAY
  DEVELOP IN A LINE OF THUNDERSTORMS MOVING ALONG THE COAST. ANY OF
  THESE FUNNEL CLOUDS COULD BRIEFLY TOUCHDOWN. THE STORMS WERE MOVING
  NORTHEAST AT 15 MPH.

* A TORNADO MAY OCCUR NEAR...
  MT PLEASANT...SULLIVANS ISLAND...ISLE OF PALMS

ABANDON MOBILE HOMES GO IN A NEARBY STURDY BUILDING. AS A LAST
RESORT LIE FLAT IN A DITCH AND COVER YOUR HEAD.

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.