Alert archive / South Carolina / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 57, NWS Charleston, SC

July 11, 2002Berkeley County, Charleston County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 11, 2002, 3:50 PM EDT for Berkeley County, Charleston County, South Carolina. It was in force for 40 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: Jul 11, 2002, 3:50 PM EDT (19:50 UTC)
Expired: Jul 11, 2002, 4:30 PM EDT
In force: 40 min
Issued by: NWS Charleston, SC
Area: Whole counties

Counties Berkeley County, SC, Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 108 km from the middle of the area, began a volume at 19:53 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.

What was reported inside it

Time	Report	Where	Remark
Jul 11, 4:00 PM EDT	Hail 0.75	Goose Creek, SC
Jul 11, 4:05 PM EDT	Thunderstorm Wind 50 E	North Charleston, SC	A large tree was blown 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

Charleston AFB, SC (KCHS), launched 12:00Z, 7.8 hours before the alert went out and 10 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: 2542 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 620 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 49 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.

389 
WUUS52 KCHS 111950
SVRCHS
SCC015-019-112030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
348 PM EDT THU JUL 11 2002

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTH CENTRAL BERKELEY COUNTY IN SOUTHEAST SOUTH CAROLINA.
  CENTRAL CHARLESTON COUNTY IN SOUTHEAST SOUTH CAROLINA.

* UNTIL 430 PM EDT.

* AT 348 PM EDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM
  SHADOWMOSS TO 3 MILES SOUTH OF YONGES ISLAND...OR FROM 9 MILES
  SOUTHWEST OF GOOSE CREEK TO 13 MILES NORTHEAST OF EDISTO BEACH...
  MOVING EAST AT 20 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  CHARLESTON AIRPORT.
  JOHNS ISLAND.
  HANAHAN.
  WEST ASHLEY.
  NORTH CHARLESTON.
  DANIEL ISLAND.
  CHARLESTON.
  FOLLY BEACH.
  JAMES ISLAND.
  MOUNT PLEASANT.

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 3295 8010 3283 8014 3264 8030 3258 7989
          3292 7974

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 Jul 11, 3:37 PM EDT, 13 minutes earlier.

Area forecast discussion, Jul 11, 3:37 PM EDT, 13 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
337 PM EDT THU JUL 11 2002

COLD FRONT SNAKES FROM NC/SC BORDER THROUGH APPALACHIANS TO SOUTHERN
KY. FRONT WILL SINK SOUTH TONIGHT...EVENTUALLY STALLING OUT
SOMEWHERE OVER SOUTH COASTAL SC FRIDAY AND LINGERING IN THE AREA
INTO THE WEEKEND. WITH FRONT ACTING AS FOCUSING MECHANISM AND
ABUNDANT MOISTURE ACROSS THE AREA...PWS AROUND 2 INCHES...WENT WITH
LIKEY POPS ALL AREAS TONIGHT THROUGH SATURDAY. GUIDANCE TEMPS LOOKED
GOOD WITH ONLY MINOR ADJUSTMENTS.

CWF...WITH BNDRY TO MOVE INTO THE NRN WATERS WILL SHIFT WINDS TO NE
LATER TONIGHT AND INTO EARLY FRI. STILL SOME UNCERTAINTY WITH WIND
DIR AS WEAK WAVES MOVE OFF THE COAST ALONG THE FRONT WHICH COULD
ALLOW THE FRONT TO SAG S BRIEFLY. AS OF NOW WILL INDICATE SRLY FLOW
TO CONTINUE THROUGH TUE AS THE BNDRY LINGERS TO THE N OF THE WATERS.
WINDS COULD INCREASE TONIGHT OUT OF THE SW OVER THE SRN WATERS THEN
THE GRADIENT IS EXPECTED TO WEAKEN. SMALL CRAFT ADVISORY CONDITIONS
ARE NOT EXPECTED.

CHS   75  84  75  84 /  60  60  60  60
SAV   75  86  75  86 /  60  60  60  60
CHL   75  84  75  84 /  60  60  60  60
NBC   75  84  75  84 /  60  60  60  60
RBW   73  82  73  82 /  60  60  60  60

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

HSA/SLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 4:02 PM EDT	Special Marine Warning	CHS		58 min
Jul 11, 4:35 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Colleton	40 min
Jul 11, 5:05 PM EDT	Special Marine Warning	CHS		55 min
Jul 11, 5:05 PM EDT	Special Marine Warning	CHS		55 min
Jul 11, 5:12 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort	48 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; radar from the NEXRAD Level II archive.