Alert archive / South Carolina / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 78, NWS Columbia, SC

July 6, 1999Lexington County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jul 6, 1999, 2:40 PM EDT for Lexington County, South Carolina. It was in force for 65 min. 1 report 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: Jul 6, 1999, 2:40 PM EDT (18:40 UTC)
Expired: Jul 6, 1999, 3:45 PM EDT
In force: 65 min
Issued by: NWS Columbia, SC
Area: Whole counties

County Lexington County, SC

What was reported inside it

Time	Report	Where	Remark
Jul 6, 2:45 PM EDT	Hail 0.75	Pelion, SC	SKYWARN spotter reported 3/4 inch hail.

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 nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 6.7 hours before the alert went out and 305 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1066 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1170 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 6, 2:00 PM EDT, 40 minutes earlier.

Area forecast discussion, Jul 6, 2:00 PM EDT, 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
200 PM EDT TUE JUL 6 1999

EASTERLY SHORTWAVE MOVING SOUTHWEST ALONG THE BASE OF THE UPPER RIDGE
PRODUCED A COMPLEX OF HEAVY RAIN AND THUNDERSTORMS OVER THE EAST PORTION
OF THE AREA DURING THE AFTERNOON. THIS FEATURE CONTINUES MOVING SLOWLY
TOWARD AUGUSTA OVERNIGHT SO EXPECT MOST OF THE RAIN AND THUNDERSTORMS TO
BE OVER THE SOUTH AND EAST MAINLY THE EARLY PART OF THE NIGHT.
PRECIPITABLE WATER VALUES AROUND 2.00 INCHES SO LOCALIZED HEAVY RAINFALL
A THREAT. ISOLATED SEVERE STORMS ALSO A THREAT NEAR CSRA. EXPECT
CONVECTION TO DIMINISH AFTER SUNSET WITH LOSS OF SURFACE HEATING AND
INSTABILITY. SOME CLOUDINESS OVERNIGHT WITH SCATTERED SHOWERS AND
THUNDERSTORMS MAINLY SOUTH AND EAST. TEMPERATURES CLOSE TO GUIDANCE
TONIGHT AND WEDNESDAY AND SLIGHTLY BELOW HIGHS. UPPER TROUGH STILL IN
THE VICINITY ON WEDNESDAY BUT THE MAIN LIFT HAS MOVED TO OUR SOUTHWEST.
WEAK UPPER TROUGH DEPRESSED FARTHER SOUTH ON THURSDAY. SOME CLOUDINESS
WEDNESDAY WILL RETARD HIGHS SLIGHTLY WITH TEMPERATURES A COUPLE OF
DEGREES HIGHER AGAIN ON THURSDAY.

CAE BB 74/92/72/94 20/30/20/0
AGS BB 72/94/71/96 40/30/20/0

.CAE...NONE.

CHARNICK

In the hours before

Local storm report, Jul 6, 1:38 PM EDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
138 PM EDT TUE JUL 06 1999

TIME (EDT) .....CITY LOCATION....... ST   ...EVENT/REMARKS...
           .....COUNTY LOCATION.....

130 PM     7NNE BOWMAN               SC   1.75 INCH HAIL
07/06/99   ORANGEBURG                     EOC REPORTED WINDSHIELD
                                          BROKEN OUT OF VEHICLE NEAR
                                          HIGHWAYS 301 AND 176 BY
                                          GOLFBALL SIZE HAIL.

KR

Local storm report, Jul 6, 2:01 PM EDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
201 PM EDT TUE JUL 06 1999

TIME (EDT) .....CITY LOCATION....... ST   ...EVENT/REMARKS...
           .....COUNTY LOCATION.....

200 PM     NEW ELLENTON              SC   .75 INCH HAIL
07/06/99   AIKEN                          AIKEN CO SHERIFF

TA

Local storm report, Jul 6, 2:19 PM EDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
219 PM EDT TUE JUL 06 1999

TIME (EDT) .....CITY LOCATION....... ST   ...EVENT/REMARKS...
           .....COUNTY LOCATION.....

215 PM     2SSW WILLISTON           SC   .75 INCH HAIL
07/06/99   BARNWELL                       BARNWELL CO SHERIFF

TA

Local storm report, Jul 6, 2:33 PM EDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
233 PM EDT TUE JUL 06 1999

TIME (EDT) .....CITY LOCATION....... ST   ...EVENT/REMARKS...
           .....COUNTY LOCATION.....

228 PM     3W BARNWELL               SC   .88 INCH HAIL
07/06/99   BARNWELL                       BARNWELL CO SHERIFF

TA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 1:25 PM EDT	Severe Thunderstorm Warning	CAE	Orangeburg	65 min
Jul 6, 1:33 PM EDT	Severe Thunderstorm Warning	CAE	Aiken	57 min
Jul 6, 1:50 PM EDT	Severe Thunderstorm Warning	CAE	Barnwell	55 min
Jul 6, 2:48 PM EDT	Severe Thunderstorm Warning	CAE	Richmond	57 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 1999 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.