Alert archive / South Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 65, NWS Columbia, SC

April 28, 20116 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Apr 28, 2011, 7:20 AM EDT for 6 counties in South Carolina. It was in force for 55 min. 4 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 28, 2011, 7:20 AM EDT (11:20 UTC)
Expired: Apr 28, 2011, 8:15 AM EDT
In force: 55 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

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

The radar

The Columbia radar (KCAE), 95 km from the middle of the area, began a volume at 11:21 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 28, 7:40 AM EDT	TORNADO	8 Ne St. Matthews, SC	TORNADO TOUCHDOWN IN THE AREA OF HWYS 601 AND 419 AND IN THE FT. MOTTE COMMUNITY. TREES AND POWERLINES DOWN. ALSO MARBLE SIZE HAIL IN THE VICINITY.
Apr 28, 7:50 AM EDT	TORNADO	5 Ssw Millwood, SC	SURVEY CONFIRMED EF1 TORNADO WITH WINDS NEAR 90 MPH. LENGTH WAS 12 MILES WITH INTERMITTENT TOUCHDOWNS. WIDTH WAS 1/8 MILE. NUMEROUS TREES SNAPPED AND DAMAGED. LARGE TREE LIMBS ON ROOFS OF HOMES.
Apr 28, 8:02 AM EDT	TSTM WND DMG	8 E South Sumter, SC	TREES DOWN ON POWERLINES NEAR MAYEWOOD MIDDLE SCHOOL. REPORTED BY BLACK RIVER ELECTRIC CO-OP.
Apr 28, 8:11 AM EDT	TORNADO	3 Wnw Turbeville, SC	EMERGENCY MANAGER REPORTED TREES DOWN ON FORGE ROAD AND PUDDING SWAMP ROAD IN THE SHILOH COMMUNITY FROM AN EF0 TORNADO. PATH LENGTH WAS 2 MILES WITH A WIDTH OF 50 TO 100 YARDS.

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 28, 4:30 AM EDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 11.3 hours before the alert went out and 102 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: 1949 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

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

431 
WUUS52 KCAE 281120
SVRCAE
SCC017-027-061-075-079-085-281215-
/O.NEW.KCAE.SV.W.0065.110428T1120Z-110428T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
720 AM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

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

* UNTIL 815 AM EDT

* AT 713 AM 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 NEAR
  EASTOVER...OR 19 MILES SOUTHEAST OF FOREST ACRES...AND MOVING
  NORTHEAST AT 50 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE SUMTER...SUMMERTON...
  ST. MATTHEWS...SOUTH SUMTER...MULBERRY...MILLWOOD...MANNING...
  EASTOVER 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.

IF ON OR NEAR LAKE MARION...GET OUT OF THE WATER AND MOVE INDOORS OR 
INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES 
FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE 
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW. 
DON'T BE CAUGHT ON THE WATER IN A THUNDERSTORM!

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 NOON EDT THURSDAY FOR EAST
CENTRAL GEORGIA AND CENTRAL SOUTH CAROLINA.

&&

LAT...LON 3382 7991 3377 7999 3372 7997 3371 7999
      3364 8002 3358 8005 3350 8121 3394 8071
      3411 8010 3399 7990 3394 7997 3389 7995
      3390 7992 3388 7988
TIME...MOT...LOC 1120Z 243DEG 61KT 3387 8062

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 2:28 AM EDT	Severe Thunderstorm Warning	CAE	McCormick	47 min
Apr 28, 2:57 AM EDT	Severe Thunderstorm Warning	CAE	Edgefield, McCormick	48 min
Apr 28, 3:24 AM EDT	Severe Thunderstorm Warning	CAE	Newberry, Saluda	51 min
Apr 28, 3:48 AM EDT	Severe Thunderstorm Warning	CAE	McCormick	42 min
Apr 28, 4:15 AM EDT	Severe Thunderstorm Warning	CAE	Edgefield, McCormick	45 min
Apr 28, 4:26 AM EDT	Severe Thunderstorm Warning	CAE	McCormick	34 min
Apr 28, 4:50 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, Lexington, Saluda	40 min
Apr 28, 4:56 AM EDT	Severe Thunderstorm Warning	CAE	McCormick	49 min
Apr 28, 5:03 AM EDT	Severe Thunderstorm Warning	CAE	Edgefield	42 min
Apr 28, 5:17 AM EDT	Severe Thunderstorm Warning	CAE	Aiken	43 min
Apr 28, 5:24 AM EDT	Areal Flood Advisory	CAE	Edgefield, McCormick	3 hr
Apr 28, 5:31 AM EDT	Severe Thunderstorm Warning	CAE	Lexington, Richland	44 min
Apr 28, 5:41 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, Saluda	49 min
Apr 28, 5:57 AM EDT	Severe Thunderstorm Warning	CAE	Lexington, Richland	48 min
Apr 28, 6:12 AM EDT	Severe Thunderstorm Warning	CAE	Aiken	48 min
Apr 28, 6:28 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Calhoun, Lexington, Orangeburg, Richland	47 min
Apr 28, 6:40 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Bamberg, Barnwell, Orangeburg	65 min
Apr 28, 6:54 AM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Lee, Richland, Sumter	66 min
Apr 28, 7:08 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell	52 min
Apr 28, 7:16 AM EDT	Severe Thunderstorm Warning	CAE	Chesterfield	44 min
Apr 28, 7:30 AM EDT	Tornado Warning	CAE	Calhoun, Clarendon, Richland, Sumter	45 min
Apr 28, 7:49 AM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Barnwell, Calhoun, Clarendon, Orangeburg	56 min
Apr 28, 8:05 AM EDT	Tornado Warning	CAE	Lee, Sumter	25 min
Apr 28, 8:16 AM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Clarendon, Lee, Orangeburg, Richland, Sumter	59 min
Apr 28, 8:45 AM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Clarendon, Orangeburg	60 min
Apr 28, 9:22 AM EDT	Severe Thunderstorm Warning	CAE	Clarendon, Lee, Orangeburg, Sumter	53 min
Apr 28, 10:59 AM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Orangeburg, Richland	31 min
Apr 28, 11:16 AM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Fairfield, Kershaw, Lee, Richland, Sumter	44 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.