Alert archive / South Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 23, NWS Columbia, SC

April 9, 2011Chesterfield County, Lancaster County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Apr 9, 2011, 6:31 PM EDT for Chesterfield County, Lancaster County, South Carolina. It was in force for 44 min. 8 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 9, 2011, 6:31 PM EDT (22:31 UTC)
Expired: Apr 9, 2011, 7:15 PM EDT
In force: 44 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Chesterfield County, SC, Lancaster County, SC

The radar

The Columbia radar (KCAE), 103 km from the middle of the area, began a volume at 22:33 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 9, 6:53 PM EDT	HAIL 1.25	Lancaster, SC	EVENT OCCURRED BETWEEN 638 PM 04/09/2011 AND 653 PM 04/09/2011
Apr 9, 6:53 PM EDT	HAIL 1.25	Lancaster, SC
Apr 9, 6:58 PM EDT	HAIL 2	Pleasant Valley, SC
Apr 9, 7:07 PM EDT	HAIL 1.75	Lancaster, SC	SPOTTER REPORTS GOLF BALL SIZED HAIL IN LANCASTER
Apr 9, 7:10 PM EDT	HAIL 1.75	7 N Lancaster, SC	COUNTY EM MEASURED GOLF BALL SIZED HAIL WITH DENTS COVERING HIS VEHICLE AND OTHERS.
Apr 9, 7:15 PM EDT	TSTM WND DMG	2 Nw Pageland, NC	SPOTTER REPORTS METAL ROOF PEELED OFF A HORSE STALL AND MULTIPLE TREES DOWN
Apr 9, 7:15 PM EDT	HAIL 1.25	Lancaster, SC
Apr 9, 7:19 PM EDT	TSTM WND DMG	6 Ne Heath Springs, SC	COUNTY EMERGENCY MANAGER REPORTED TREES DOWN ALONG MUSKET ROAD.

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 9, 2:44 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 9, 6:16 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.5 hours before the alert went out and 160 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: 704 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 256 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.

216 
WUUS52 KCAE 092231
SVRCAE
SCC025-057-092315-
/O.NEW.KCAE.SV.W.0023.110409T2231Z-110409T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
631 PM EDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

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

* UNTIL 715 PM EDT

* AT 629 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO
  GOLF BALL SIZE.  THIS STORM WAS LOCATED 25 MILES NORTH OF
  LANCASTER...OR 11 MILES NORTHEAST OF ROCK HILL...AND MOVING
  SOUTHEAST AT 40 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE PAGELAND...
  LANCASTER...IRWIN...HEATH SPRINGS AND ELGIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 200 AM EDT SUNDAY MORNING FOR
CENTRAL SOUTH CAROLINA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 900 PM EDT SATURDAY EVENING FOR EAST CENTRAL GEORGIA AND
CENTRAL SOUTH CAROLINA.

&&

LAT...LON 3494 8078 3482 8079 3482 8040 3477 8033
      3452 8078 3465 8090 3470 8087 3475 8089
      3479 8088 3482 8090 3484 8087 3490 8088
      3493 8087 3501 8091 3505 8090 3506 8090
TIME...MOT...LOC 2230Z 313DEG 38KT 3506 8091

$$

HC

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 5:30 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Lancaster	60 min
Apr 9, 6:01 PM EDT	Tornado Warning	CAE	Lancaster	44 min
Apr 9, 6:41 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Kershaw, Lancaster	49 min
Apr 9, 7:15 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Kershaw, Lancaster, Lee	45 min
Apr 9, 7:51 PM EDT	Areal Flood Advisory	CAE	Chesterfield, Kershaw, Lancaster	114 min
Apr 9, 7:58 PM EDT	Severe Thunderstorm Warning	CAE	Lee, Sumter	47 min

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.