Alert archive / South Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 233, NWS Columbia, SC

August 17, 2012Lee County, Sumter County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Aug 17, 2012, 3:28 PM EDT for Lee County, Sumter County, South Carolina. It was in force for 62 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 17, 2012, 3:28 PM EDT (19:28 UTC)
Expired
Aug 17, 2012, 4:30 PM EDT
In force
62 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon

Counties Lee County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 81 km from the middle of the area, began a volume at 19:29 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

TimeReportWhereRemark
Aug 17, 3:50 PM EDTTSTM WND DMG12 Sw Bishopville, SCPUBLIC REPORTS BENT AND TWISTED REBAR, COTTON WAGON BLOWN OVER, BARBED WIRE CHEWED UP AND PORTABLE BARN MOVED A FEW INCHES IN WOODROW, SC. PATH OF DAMAGE ABOUT 100 YDS FAIRLY STRAIGHT LINE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 7.5 hours before the alert went out and 130 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2012-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 894 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2012-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
894 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1044 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
67 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.

568 
WUUS52 KCAE 171928
SVRCAE
SCC061-085-172030-
/O.NEW.KCAE.SV.W.0233.120817T1928Z-120817T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
328 PM EDT FRI AUG 17 2012

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LEE COUNTY IN CENTRAL SOUTH CAROLINA
  CENTRAL SUMTER COUNTY IN CENTRAL SOUTH CAROLINA

* UNTIL 430 PM EDT

* AT 320 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 10
  MILES NORTH OF MULBERRY...OR 10 MILES NORTH OF SUMTER...AND MOVING
  EAST AT 10 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE SUMTER...SOUTH
  SUMTER...MULBERRY...MILLWOOD AND BISHOPVILLE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE...TOLL FREE 1 877 6 3
3...6 7 7 2.

&&

LAT...LON 3385 8018 3380 8026 3377 8043 3421 8046
      3421 8044 3423 8043 3429 8013 3419 8012
      3416 8015 3412 8012 3387 8011
TIME...MOT...LOC 1928Z 270DEG 10KT 3409 8034

$$

LM
1 follow-up statement
146 
WWUS52 KCAE 171956
SVSCAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
356 PM EDT FRI AUG 17 2012

SCC061-085-172030-
/O.CON.KCAE.SV.W.0233.000000T0000Z-120817T2030Z/
LEE SC-SUMTER SC-
356 PM EDT FRI AUG 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SUMTER AND LEE COUNTIES...

AT 350 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 8 MILES NORTHWEST OF MAYESVILLE...OR 9 MILES SOUTH OF
BISHOPVILLE...MOVING EAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTIES.

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1...8 7
7...6 3 3...6 7 7 2.

LAT...LON 3387 8011 3385 8018 3380 8026 3380 8031
      3417 8020 3427 8014 3419 8012 3416 8015
      3412 8012
TIME...MOT...LOC 1956Z 270DEG 10KT 3409 8025

$$

LM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 1:44 PM EDTSpecial Weather StatementCAERichland31 min
Aug 17, 2:58 PM EDTSpecial Weather StatementCAEClarendon, Lee, Sumter77 min
Aug 17, 3:09 PM EDTSevere Thunderstorm WarningCAEClarendon, Sumter66 min
Aug 17, 3:48 PM EDTSevere Thunderstorm WarningCAEClarendon, Lee, Orangeburg, Sumter57 min
Aug 17, 4:26 PM EDTSevere Thunderstorm WarningCAEOrangeburg49 min
Aug 17, 5:28 PM EDTSpecial Weather StatementCAEAiken62 min
Aug 17, 5:40 PM EDTSevere Thunderstorm WarningCAEAiken51 min
Aug 17, 6:17 PM EDTSevere Thunderstorm WarningCAEChesterfield, Kershaw, Lancaster58 min
Aug 17, 6:37 PM EDTSevere Thunderstorm WarningCAEFairfield, Kershaw38 min
Aug 17, 6:53 PM EDTSpecial Weather StatementCAERichland52 min
Aug 17, 7:11 PM EDTSevere Thunderstorm WarningCAEChesterfield, Fairfield, Kershaw, Lancaster, Lee64 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2012Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.