Alert archive / South Carolina / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 19, NWS Wilmington, NC

May 12, 2001Williamsburg County, South Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at May 12, 2001, 2:49 PM EDT for Williamsburg County, South Carolina. It was in force for 56 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: May 12, 2001, 2:49 PM EDT (18:49 UTC)
Expired: May 12, 2001, 3:45 PM EDT
In force: 56 min
Issued by: NWS Wilmington, NC
Area: Whole counties

County Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 127 km from the middle of the area, began a volume at 19:01 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, 6.8 hours before the alert went out and 84 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: 295 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1159 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 27 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.

000 
WUUS52 KILM 121849
SVRILM
SCC089-121945-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WILMINGTON NC
249 PM EDT SAT MAY 12 2001

THE NATIONAL WEATHER SERVICE IN WILMINGTON NC HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WILLIAMSBURG COUNTY IN NORTHEAST SOUTH CAROLINA

* UNTIL 345 PM EDT

* AT 246 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS OVER
  GREELEYVILLE...OR ABOUT 10 MILES SOUTHWEST OF KINGSTREE...MOVING
  EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   SALTERS AT 255 PM EDT
   KINGSTREE AT 300 PM EDT
   INDIANTOWN AT 325 PM EDT
   NESMITH AT 330 PM EDT
   HEMINGWAY AT 335 PM EDT

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN WILMINGTON NC.

.END

$$
DIGIORGI

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 Wilmington, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at May 12, 2:05 PM EDT, 44 minutes earlier.

Area forecast discussion, May 12, 2:05 PM EDT, 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON, NC
205 PM EDT SAT MAY 12 2001

ZFP: CONVECTION HAS BEGUN TO THE SOUTHWEST OF THE AREA OVER THE PAST
FEW HOURS. IT APPEARS THAT THE DRY AIR BEING ENTRAINED INTO THE
CYCLONIC CIRCULATION HAS SUPPRESSED THE CLOUD DEVELOPMENT A BIT. AS
THE VORTEX CONTINUES TO LIFT OFF TO THE NORTHEAST CONVECTION IS
FORMING IN THE MOISTURE GRADIENT TO THE SOUTHWEST OF THE CENTER.

WITH THE WEST TO SOUTHWEST FLOW TEMPERATURES HAVE WARMED UP INTO THE
UPPER 80S WITH DEWPOINTS IN THE MID 60S ALONG THE COAST BUT IN THE
55-60 DEGREE RANGE INLAND.

SO AS FRONT APPROACHES OVERNIGHT WILL CONTINUE WITH A CHANCE OF
THUNDERSTORMS AND EXPECT PRECIPITATION TO EXIT THE COAST BY SUNDAY
MORNING.

NEXT CHANCE OF PRECIPITATION LATE ON TUESDAY IS WITH A FRONTAL
PASSAGE IN THE NORTHWEST FLOW ON THE BACKSIDE OF THE MEAN TROUGH.

CWF: CURRENT WINDS AT FPSN7 IS RUNNING BETWEEN 20 AND 25 KNOTS. THE
COASTAL OBSERVATIONS AT 2 PM INDICATED 23 KNOTS AT SPRINGMAID PIER.
SO WITH FRONTAL PASSAGE WILL CONTINUE SMALL CRAFT FOR WINDS OF 20 TO
25 KNOTS.  WINDS WILL DROP BELOW SCA CRITERIA AFTER FRONTAL PASSAGE
ON SUNDAY.

FCSTID = 7
ILM   61  76  51  79 /  50  10   0   0
LBT   59  77  48  82 /  40  10   0   0
FLO   59  79  49  83 /  40  10   0   0
MYR   62  75  50  78 /  50  10   0   0

.ILM...
NC...SMALL CRAFT ADVISORY AMZ250-252.
SC...SMALL CRAFT ADVISORYF AMZ254-256.

HAWKINS

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 12, 4:10 PM EDT	Severe Thunderstorm Warning	ILM	Georgetown	35 min
May 12, 5:28 PM EDT	Severe Thunderstorm Warning	ILM	Horry	62 min
May 12, 7:02 PM EDT	Severe Thunderstorm Warning	ILM	Florence, Williamsburg	58 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2001 Every severe thunderstorm warning in 2001

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.