Alert archive / South Carolina / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 22, NWS Wilmington, NC

April 9, 1998Florence County, South Carolina

NWS Wilmington, NC issued this severe thunderstorm warning at Apr 9, 1998, 12:52 AM EDT for Florence County, South Carolina. It was in force for 33 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: Apr 9, 1998, 12:52 AM EDT (04:52 UTC)
Expired: Apr 9, 1998, 1:25 AM EDT
In force: 33 min
Issued by: NWS Wilmington, NC
Area: Whole counties

County Florence County, SC

The radar

The Wilmington radar (KLTX), 117 km from the middle of the area, began a volume at 04:52 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 8, 10:00 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 4.9 hours before the alert went out and 128 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 942 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 320 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.

279 
WUUS1 KILM 090454
SVRILM
SCC041-090525-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE WILMINGTON NC
1252 AM EDT THU APR 9 1998

THE NATIONAL WEATHER SERVICE IN WILMINGTON NC HAS ISSUED A...

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHERN FLORENCE COUNTY IN NORTHEASTERN SOUTH CAROLINA

* UNTIL 125 AM EDT

* AT 1251 AM EDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  WITH LARGE HAIL 23 MILES SOUTH OF FLORENCE OR 8 MILES WEST OF
  KINGSBURG MOVING EAST AT 55 MPH.

* THIS STORM WILL BE IN THE VICINITY OF...
        JOHNSONVILLE            BY 1255 AM EDT
        KINGSBURG               BY 1255 AM EDT


LARGE HAIL...HEAVY RAIN...AND DEADLY LIGHTNING ARE EXPECTED. SEEK
SHELTER IN A STRONG BUILDING AWAY FROM WINDOWS. DO NOT USE
TELEPHONES OR ELECTRICAL APPLIANCES UNTIL THE STORM HAS
PASSED...EXCEPT IN AN EMERGENCY. MOTORISTS SHOULD AVOID FLOODED
ROADWAYS.

LGE

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 Apr 8, 9:12 PM EDT, 3 hours 40 minutes earlier.

Area forecast discussion, Apr 8, 9:12 PM EDT, 3 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEWPORT/MOREHEAD CITY NC
912 PM EDT WED APR 8 1998

RDU: NO CHANGES.

CWF: NO CHANGES.  BEGINING TO MIX OVER WATER NOW THAT SUN HAS SET
WITH WINDS IN SCA RANGE.

RDU: MAIN QUESTION IS SVR POTENTIAL OVERNIGHT.  12Z MHX SOUNDING WAS
UNSTABLE BUT CAPES WERE LOW.  HOWEVER...FURTHER DOWNSTREAM OVER FFC
CAPES WERE NR 1000 WITH MODERATE HELICITIES.  CLUSTER OF SUPER CELL
TSTMS BREAKING OUT IN STRONGLY DIFLUENT AIRMASS ACROSS THE DEEP
SOUTH.  12Z MODELS BRING THESE CONDITIONS INTO ESTRN NC AFT MIDNIGHT
TONIGHT.  TSTM CLUSTERS MAY MERGE INTO MCS WITH LEADING EDGE BRINING
SVR THREAT TO MY CWA AFT 06Z.  LINE OF CONVECTION MAINLY NW OF RDU
ATTM SHOULD CONTINUE TO WEAKEN WITH LOSS OF HEATING.

BRISK WINDS AND DEWPOINTS IN THE 60S WILL PREVENT TEMPS FROM FALLING
MUCH BELOW CURRENT LEVELS.

.MHX...SCA CSTL WTRS AND SNDS.

ELARDO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 6:58 AM EDT	Tornado Warning	ILM	Georgetown, Williamsburg	47 min
Apr 9, 7:15 AM EDT	Tornado Warning	ILM	Horry	30 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 1998 Every severe thunderstorm warning in 1998

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.