Alert archive / South Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Columbia, SC

April 5, 20117 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Apr 5, 2011, 4:57 AM EDT for 7 counties in South Carolina. It was in force for 63 min. 5 reports 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: Apr 5, 2011, 4:57 AM EDT (08:57 UTC)
Expired: Apr 5, 2011, 6:00 AM EDT
In force: 63 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Bamberg County, SC, Calhoun County, SC, Clarendon County, SC, Lee County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 84 km from the middle of the area, began a volume at 08:57 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
Apr 5, 5:18 AM EDT	TSTM WND DMG	Sumter, SC	TREES DOWN ON HWY 261...STAMEY LIVESTOCK RD AND NAZARENE RD.
Apr 5, 5:20 AM EDT	TSTM WND GST 43	2 Nne Santee, SC	NWS WIND EQUIPMENT AT SANTEE STATE PARK ON LAKE MARION REPORTED A WIND GUST OF 43 MPH.
Apr 5, 5:25 AM EDT	TSTM WND DMG	Bishopville, SC	TREES DOWN ON KELLY BRIDGE RD. IN BISHOPVILLE.
Apr 5, 5:36 AM EDT	TSTM WND DMG	9 Ene Bowman, SC	ORANGEBURG SHERIFF REPORTED TREES DOWN IN THE TOWN OF PROVIDENCE.
Apr 5, 5:45 AM EDT	TSTM WND DMG	Manning, SC	SHERIFF REPORTED TREES DOWN ON HWY 261 AND OLD GEORGETOWN ROADS IN MANNING.

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

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 5, 12:48 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 9.0 hours before the alert went out and 80 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: 106 J/kg
Mixed-layer CIN: -189 J/kg
Mixed-layer LCL: 1161 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

135 
WUUS52 KCAE 050857
SVRCAE
SCC009-017-027-061-075-079-085-051000-
/O.NEW.KCAE.SV.W.0021.110405T0857Z-110405T1000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
457 AM EDT TUE APR 5 2011

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BAMBERG COUNTY IN CENTRAL SOUTH CAROLINA
  LEE COUNTY IN CENTRAL SOUTH CAROLINA
  SOUTHEASTERN RICHLAND COUNTY IN CENTRAL SOUTH CAROLINA
  EASTERN CALHOUN COUNTY IN CENTRAL SOUTH CAROLINA
  SUMTER COUNTY IN CENTRAL SOUTH CAROLINA
  CLARENDON COUNTY IN CENTRAL SOUTH CAROLINA
  ORANGEBURG COUNTY IN CENTRAL SOUTH CAROLINA

* UNTIL 600 AM EDT

* AT 455 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 43 MILES NORTHEAST OF BISHOPVILLE TO 20 MILES SOUTHWEST OF
  BAMBERG...OR ALONG A LINE EXTENDING FROM 7 MILES NORTH OF CHERAW TO
  6 MILES NORTHEAST OF ALLENDALE...AND MOVING SOUTHEAST AT 50 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE SUMTER...SUMMERTON...
  ST. MATTHEWS...SOUTH SUMTER...ORANGEBURG...MULBERRY...MILLWOOD...
  MANNING...HOLLY HILL...ELLOREE...BROOKDALE...BRANCHVILLE...
  BOWMAN...BISHOPVILLE...BAMBERG AND OAKLAND

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 AM EDT TUESDAY MORNING
FOR EAST CENTRAL GEORGIA AND CENTRAL SOUTH CAROLINA.

&&

LAT...LON 3377 7999 3372 7997 3351 8009 3346 8014
      3345 8022 3330 8025 3327 8029 3326 8041
      3333 8051 3313 8088 3306 8090 3309 8095
      3303 8108 3312 8119 3437 8028 3422 8011
      3414 8013 3399 7990 3394 7997 3388 7988
TIME...MOT...LOC 0857Z 295DEG 46KT 3474 7982 3302 8111

$$

SJN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 1:21 AM EDT	Severe Thunderstorm Warning	CAE	Edgefield, Fairfield, McCormick, Newberry, Saluda	54 min
Apr 5, 1:55 AM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster	50 min
Apr 5, 2:21 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Chesterfield, Edgefield, Fairfield, Kershaw, Lancaster and 5 more	54 min
Apr 5, 3:14 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell, Chesterfield, Edgefield, Fairfield, Kershaw and 5 more	61 min
Apr 5, 4:00 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Bamberg, Barnwell, Calhoun, Chesterfield, Fairfield and 7 more	60 min
Apr 5, 3:11 PM EDT	Frost Advisory	CAE	Chesterfield, Edgefield, Fairfield, Kershaw, Lee, McCormick and 2 more	18 hr

Nearby

Severe Thunderstorm Warnings in South Carolina, 2011 Every severe thunderstorm warning in 2011

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.