Alert archive / South Carolina / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 132, NWS Columbia, SC

August 18, 2000Barnwell County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Aug 18, 2000, 6:42 PM EDT for Barnwell County, South Carolina. It was in force for 33 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Aug 18, 2000, 6:42 PM EDT (22:42 UTC)
Expired: Aug 18, 2000, 7:15 PM EDT
In force: 33 min
Issued by: NWS Columbia, SC
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Barnwell County, SC

The radar

The Charleston,SC radar (KCLX), 61 km from the middle of the area, began a volume at 22:45 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
Aug 18, 7:08 PM EDT	Thunderstorm Wind 60 E	Snelling, SC	State Law Enforcement reported trees and powerlines down and a tractor trailer overturned.

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, 10.7 hours before the alert went out and 132 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: 2682 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 792 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

196 
WUUS52 KCAE 182242
SVRCAE
SCC011-182315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
642 PM EDT FRI AUG 18 2000

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BARNWELL COUNTY IN CENTRAL SOUTH CAROLINA

* UNTIL 715 PM EDT.

* AT 640 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM 8 MILES WEST OF SNELLING...OR ABOUT 13 MILES   
WEST OF BARNWELL...MOVING SOUTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  KLINE AT 705 PM EDT

THIS IS A DANGEROUS STORM. STAY INDOORS AWAY FROM WINDOWS.

REPORT ANY HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY SHERIFF
OR TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN COLUMBIA.

LAT...LON 3328 8154 3313 8165 3287 8117 3306 8103

JDB

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 Columbia, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 2:58 PM EDT, 3 hours 44 minutes earlier.

Area forecast discussion, Aug 18, 2:58 PM EDT, 3 hours 44 minutes before

SCZ015-016-018-020>022-025>031-035>038-041-GAZ040-063>065-077-190641-

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
258 PM EDT FRI AUG 18 2000

SHORT WAVE OVER TN WILL MOVE ACROSS THE AREA TONIGHT. THIS IN
CONJUNCTION WITH STRONG INSTABILITY AND SURFACE FRONT WILL BRING
THUNDERSTORMS TO THE AREA THIS EVENING INTO TONIGHT. WILL KEEP
SEVERE WORDING FOR THIS EVENING/TONIGHT AND GO WITH LIKELY OR HIGH
CHANCE POPS.

SURFACE FRONT SHOULD BE JUST SOUTH OF THE AREA BY 12Z SATURDAY.
SURFACE LOW FORMS OVER SRN GA AND SURFACE FLOW BECOMES NORTHEAST.
HIGH PRESSURE BUILDING IN FROM THE NORTH SHOULD DRY OUT MY NORTHERN
COUNTIES. AM A BIT CONCERNED FOR MY SOUTHERN COUNTIES. PROXIMITY OF
FRONT MAY BE ENOUGH KEEP A SLIGHT CHANCE OF SHOWERS/TSTMS IN FOR
SATURDAY. ATMOSPHERE STILL A BIT UNSTABLE. AVN BRINGS IN DRIER AIR
BUT ETA KEEPS QUITE A BIT OF LOW LEVEL MOISTURE AROUND. NO POPS
SATURDAY NIGHT AND SLIGHT CHANCE FOR SUNDAY. FWC/FAN TEMPS CLOSE TO
LOCAL SCHEMES ..SO WILL NOT DEVIATE.

FOR THE EXTENDED...UPPER RIDGE HOLDS OVER TX WITH TROF OVER THE
NORTHEASTERN STATES. APPROACH OF COLD FRONT WEDNESDAY. WILL GO WITH
SLIGHT CHANCE POPS MONDAY AND TUESDAY THEN CHANCE ON WEDNESDAY.
GUIDANCE TEMPS CLOSE TO CLIMATOLOGY. WILL FOLLOW.

FCSTID = 10
CAE   73  90  69  88 /  60  10  10  20
AGS   74  92  69  90 /  50  20  10  20
SSC   71  89  69  88 /  60  10  10  20
OGB   73  92  70  88 /  60  10  10  20

.CAE...
GA...NONE.
SC...NONE.

LM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 3:38 PM EDT	Severe Thunderstorm Warning	CAE	Richland, Sumter	37 min
Aug 18, 6:14 PM EDT	Severe Thunderstorm Warning	CAE	Barnwell	31 min
Aug 18, 7:46 PM EDT	Severe Thunderstorm Warning	CAE	Lee	29 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2000 Every severe thunderstorm warning in 2000

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.