Alert archive / South Carolina / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 84, NWS Charleston, SC

August 18, 2002Allendale County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Aug 18, 2002, 7:51 PM EDT for Allendale County, South Carolina. It was in force for 24 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: Aug 18, 2002, 7:51 PM EDT (23:51 UTC)
Expired: Aug 18, 2002, 8:15 PM EDT
In force: 24 min
Issued by: NWS Charleston, SC
Area: Whole counties

County Allendale County, SC

What was reported inside it

Time	Report	Where	Remark
Aug 18, 8:05 PM EDT	Thunderstorm Wind 50 E	Sycamore, SC	Several trees and large limbs were down.

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

Jacksonville, FL (KJAX), launched 12:00Z, 11.9 hours before the alert went out and 279 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: 705 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 942 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -1 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.

690 
WUUS52 KCHS 182351
SVRCHS
SCC005-190015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
750 PM EDT SUN AUG 18 2002

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALLENDALE COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 815 PM EDT.

* AT 750 PM EDT...RADAR INDICATED A SEVERE THUNDERSTORM NEAR ULMER...
  OR ABOUT 8 MILES NORTHEAST OF ALLENDALE...MOVING EAST AT 15 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...RURAL         
  NORTHEASTERN ALLENDALE COUNTY.

DIME SIZE HAIL AND 60 MPH WINDS ARE EXPECTED IN THE WARNED AREA.

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

$$

LAT...LON 3320 8127 3303 8133 3304 8106 3318 8082

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 Charleston, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 3:36 PM EDT, 4 hours 15 minutes earlier.

Area forecast discussion, Aug 18, 3:36 PM EDT, 4 hours 15 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
336 PM EDT SUN AUG 18 2002

NOT MUCH CHANGE OVER THE NEXT FEW DAYS. LEESIDE TROF REMAINS ACROSS
THE CAROLINAS WITH VERY WARM AND HUMID AIRMASS ACROSS THE REGION.
COOL FRONT DROPS SOUTH BY MIDWEEK. WITH FLOW ALOFT ZONAL DONT THINK
IT WILL MAKE IT VERY FAR INTO SOUTH CAROLINA...PROBABLY SOMEWHERE
AROUND THE SC/NC BORDER. HAVE PUT IN 40 PERCENT EVENING POPS TO
COVER ONGOING CONVECTION...THEN 30 POPS MONDAY AND MONDAY NIGHT.
BUMPED POPS UP A BIT FOR TUESDAY AS VORT AXIS MOVES OVER THE
AREA...AND ALSO ON WEDNESDAY AS FRONT MOVES INTO NORTHERN PART OF
STATE.

MARINE...ATLC RIDGE TO REMAIN S OF THE FCST AREA THRU AT LEAST TUE
OR WED...AS TROF REMAINS ACROSS THE CAROLINAS AND GA. THE RESULT IS
A LIGHT TO MODERATE SW SYNOPTIC FLOW. OF COURSE THERE WILL BE THE
LOCAL SEA/LAND BREEZE EFFECTS EACH AFTRN/NIGHT NEAR SHORE. VERY WEAK
COOL FRONT MAY APPROACH SC WATERS WED OR THU WITH FIRST A SLACKENING
OF THE  WINDS TO 10 KT OR LESS...THEN SHIFTING TO MORE ONSHORE (E OR
SE) AS THE FRONT BECOMES DIFFUSE AND WEAK HI MOVES OFF THE NE STATES
THU/FRI.

CHS   78  91  79  91 /  40  30  30  50
SAV   75  94  75  94 /  40  30  30  50
CHL   78  91  79  91 /  40  30  30  50
NBC   78  91  79  91 /  40  30  30  50
RBW   74  94  76  94 /  40  30  30  50
MHP   75  94  75  94 /  40  30  30  50

.CHS...
GA...NONE.
SC...NONE.

HSA/PM

In the hours before

Local storm report, Aug 18, 4:08 PM EDT, 3 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON, SC
408 PM EDT SUN AUG 18 2002

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

0404 PM    THUNDERBOLT               GA   .88 INCH HAIL
08/18/02   CHATHAM                        REPORTED BY SPOTTERS

Local storm report, Aug 18, 4:13 PM EDT, 3 hours 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON, SC
413 PM EDT SUN AUG 18 2002

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

0405 PM    THUNDERBOLT               GA   .75 INCH HAIL
08/18/02   CHATHAM                        REPORTED BY SPOTTERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 3:12 PM EDT	Special Marine Warning	CHS		63 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2002 Every severe thunderstorm warning in 2002

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.