Alert archive / South Carolina / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 74, NWS Wilmington, NC

August 31, 2001Horry County, South Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at Aug 31, 2001, 5:33 PM EDT for Horry County, South Carolina. It was in force for 27 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 31, 2001, 5:33 PM EDT (21:33 UTC)
Expired: Aug 31, 2001, 6:00 PM EDT
In force: 27 min
Issued by: NWS Wilmington, NC
Area: Whole counties

County Horry County, SC

The radar

The Wilmington radar (KLTX), 51 km from the middle of the area, began a volume at 21:32 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, 9.6 hours before the alert went out and 147 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: 2452 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 19 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.

702 
WUUS52 KILM 312133
SVRILM
SCC051-312200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WILMINGTON NC
533 PM EDT FRI AUG 31 2001

THE NATIONAL WEATHER SERVICE IN WILMINGTON NC HAS ISSUED A

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

* UNTIL 600 PM EDT

* AT 526 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS OVER
  LORIS...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   LONGS AT 540 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

$$

CRM

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 Aug 31, 2:40 PM EDT, 2 hours 53 minutes earlier.

Area forecast discussion, Aug 31, 2:40 PM EDT, 2 hours 53 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON, NC
240 PM EDT FRI AUG 31 2001

H5 TROUGH MOVES EAST TOWARD REGION TONIGHT. ETA MUCH LESS
AGGRESSIVE  WITH SHORT WAVE ACTIVITY ROUNDING BASE OF TROUGH AND
MOVING INTO CWA. AVN REMAINS FAIRLY CONSISTENT IN BRINGING SERIES OF
S/W THROUGH OVERNIGHT AND SAT.

SOME SHOWERS AND TSTMS FORMING IN MOIST SOMEWHAT UNSTABLE ATMOSPHERE
THIS AFTN. WILL CARRY CHC POPS TNGT. TEMPS SIMILAR TO THOSE OF LAST
NIGHT.

FRONT NEARS REGION SAT AND FINALLY CROSSES CWA SAT NIGHT AND SUN
MORNING. STILL LOOKS LIKE A GOOD BET FOR SHOWERS AND TSTMS. WILL
CONTINUE WITH LIKELY...60% POPS. SHOWER/TSTM POTENTIAL CONTINUES SAT
NIGHT AS FRONT MOVES THROUGH ILM CWA...SO WILL CONTINUE CHC POPS.

FRONT PUSHES OFFSHORE EARLY SUN. MODELS...ESPECIALLY MRF TRYING TO
DRASTICALLY DRY ATMOSPHERE OUT. PLAN TO RETAIN SLIGHT CHC POP SUN
MORNING COASTAL ZONES TO ACCOUNT FOR LEFTOVER MOISTURE AND POSSIBLE
SHOWER AS FRONT EXISTS TO COASTAL WATERS. AFTER THAT...ATMOSPHERE
COOLER AND DRIER AND FCST WILL REMAIN DRY SUN NIGHT THROUGH WED. AS
AIRMASS BEGINS TO MODIFY AGAIN...WILL ACCOUNT FOR DIURNAL SHOWER AND
TSTM ACTIVITY WITH CHC/SLIGHT CHC POPS.

CWF: GRADIENT TO GRADUALLY INCREASE AHEAD OF COLD FRONT AND HENCE
WILL GRADUALLY INCREASE SW WINDS AS WELL AS SEAS TNGT AND SAT.
WINDS SAT WILL BE HELD AT 20 KT AND GUSTY WITH 5 FT SEAS...JUST
BELOW SCA LEVELS. WINDS SLOWLY TRANSITION TO W OVERNIGHT SAT. SUN
WIND DIRECTION DEPENDANT ON AVN SOLUTION OF WEAK LOW DEVELOPING
ALONG FRONT AND PUSHING OFF. MAY INITIALIZE SUN WITH VARIABLE
BECOMING NE.

PRELIMINARY NUMBERS...
FCSTID = 30
ILM   74  87  71  85/  30  60  40  20
LBT   72  88  68  83/  30  60  40  10
FLO   73  87  69  84/  30  60  40  10
MYR   75  86  72  84/  30  60  40  20

.ILM...
NC...NONE.
SC...NONE.

PJN

In the hours before

Local storm report, Aug 31, 4:47 PM EDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON, NC
447 PM EDT FRI AUG 31 2001

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

0440 PM    RAINS                     SC   .75 INCH HAIL
08/31/01   MARION                         REPORTED BY PUBLIC

CH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 4:26 PM EDT	Severe Thunderstorm Warning	ILM	Marion	34 min
Aug 31, 5:16 PM EDT	Severe Thunderstorm Warning	ILM	Marion	44 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.