Alert archive / South Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 199, NWS Columbia, SC

July 28, 2012Kershaw County, Lancaster County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jul 28, 2012, 8:21 PM EDT for Kershaw County, Lancaster County, South Carolina. It was in force for 39 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: Jul 28, 2012, 8:21 PM EDT (00:21 UTC)
Expired: Jul 28, 2012, 9:00 PM EDT
In force: 39 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Kershaw County, SC, Lancaster County, SC

The radar

The Columbia radar (KCAE), 77 km from the middle of the area, began a volume at 00:23 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
Jul 28, 8:55 PM EDT	TSTM WND DMG	3 Sw Heath Springs, SC	MULTIPLE TREES DOWN ON BETHEL ROAD..BLOCKING PORTIONS OF THE ROADWAY

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

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.4 hours before the alert went out and 185 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: 846 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1942 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

043 
WUUS52 KCAE 290021
SVRCAE
SCC055-057-290100-
/O.NEW.KCAE.SV.W.0199.120729T0021Z-120729T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
821 PM EDT SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN KERSHAW COUNTY IN CENTRAL SOUTH CAROLINA
  SOUTHERN LANCASTER COUNTY IN CENTRAL SOUTH CAROLINA

* UNTIL 900 PM EDT

* AT 821 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 16
  MILES WEST OF HEATH SPRINGS...OR 12 MILES SOUTHWEST OF LANCASTER...
  AND MOVING EAST AT 25 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE KERSHAW AND HEATH
  SPRINGS

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 3461 8048 3442 8074 3450 8088 3454 8088
      3455 8088 3457 8088 3460 8089 3465 8090
      3468 8088 3470 8086
TIME...MOT...LOC 0021Z 290DEG 21KT 3461 8091

$$

LM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 8:01 PM EDT	Special Weather Statement	CAE	Fairfield, Lancaster	59 min
Jul 28, 9:04 PM EDT	Special Weather Statement	CAE	Lancaster	56 min
Jul 28, 9:08 PM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Lancaster	52 min
Jul 28, 10:28 PM EDT	Special Weather Statement	CAE	Chesterfield	62 min
Jul 28, 10:35 PM EDT	Special Weather Statement	CAE	Fairfield	55 min
Jul 28, 10:37 PM EDT	Special Weather Statement	CAE	Lexington	53 min
Jul 28, 11:28 PM EDT	Special Weather Statement	CAE	Lancaster	47 min
Jul 28, 11:50 PM EDT	Special Weather Statement	CAE	Kershaw, Lee	55 min
Jul 29, 1:08 AM EDT	Special Weather Statement	CAE	Lee, Sumter	67 min
Jul 29, 3:14 PM EDT	Severe Thunderstorm Warning	CAE	Orangeburg	25 min
Jul 29, 3:51 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell	24 min
Jul 29, 5:45 PM EDT	Special Weather Statement	CAE	Calhoun	60 min
Jul 29, 5:47 PM EDT	Special Weather Statement	CAE	Calhoun	58 min
Jul 29, 6:28 PM EDT	Areal Flood Advisory	CAE	Bamberg, Calhoun, Lexington, Orangeburg	99 min
Jul 29, 7:42 PM EDT	Areal Flood Advisory	CAE	Richland	48 min
Jul 29, 7:57 PM EDT	Special Weather Statement	CAE	Clarendon, Richland, Sumter	63 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2012 Every 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.