Alert archive / South Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 177, NWS Columbia, SC

June 21, 20115 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jun 21, 2011, 10:10 PM EDT for 5 counties in South Carolina. It was in force for 50 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: Jun 21, 2011, 10:10 PM EDT (02:10 UTC)
Expired: Jun 21, 2011, 11:00 PM EDT
In force: 50 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Aiken County, SC, Calhoun County, SC, Lexington County, SC, Orangeburg County, SC, Richland County, SC

The radar

The Columbia radar (KCAE), 32 km from the middle of the area, began a volume at 02:13 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
Jun 21, 10:21 PM EDT	TSTM WND DMG	Neeses, SC	SHERIFF DISPATCH REPORTED TREES DOWN IN NEESES AND NORWAY.
Jun 21, 10:22 PM EDT	TSTM WND DMG	6 Ne Swansea, SC	SEVERAL LIMBS DOWN NEAR SWANSEA. ALSO 1/2 INCH HAIL.
Jun 21, 10:27 PM EDT	TSTM WND DMG	1 Se Neeses, SC	SOUTH CAROLINA HIGHWAY PATROL REPORTED TREES DOWN ON NEESE HIGHWAY AND JUNIPER STREET.
Jun 21, 10:45 PM EDT	TSTM WND GST 65	6 W St. Matthews, SC	TRUCK DRIVER ON I-26 AT MM 137 REPORTED ESTIMATED 65 MPH WINDS AND NICKEL SIZED HAIL
Jun 21, 11:06 PM EDT	TSTM WND DMG	10 W Eastover, SC	SHERIFF DISPATCH REPORTED TREES DOWN IN THE HOPKINS AREA.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 4 storm reports to this severe thunderstorm warning; the first came 11 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 2.2 hours before the alert went out and 132 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: 1536 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1870 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

084 
WUUS52 KCAE 220210
SVRCAE
SCC003-017-063-075-079-220300-
/O.NEW.KCAE.SV.W.0177.110622T0210Z-110622T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
1010 PM EDT TUE JUN 21 2011

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN LEXINGTON COUNTY IN CENTRAL SOUTH CAROLINA
  SOUTHERN RICHLAND COUNTY IN CENTRAL SOUTH CAROLINA
  EASTERN AIKEN COUNTY IN CENTRAL SOUTH CAROLINA
  CALHOUN COUNTY IN CENTRAL SOUTH CAROLINA
  NORTHWESTERN ORANGEBURG COUNTY IN CENTRAL SOUTH CAROLINA

* UNTIL 1100 PM EDT

* AT 1009 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM SOUTH CONGAREE TO 11 MILES
  SOUTH OF GASTON TO 25 MILES WEST OF ORANGEBURG...OR ALONG A LINE
  EXTENDING FROM RED BANK TO 19 MILES SOUTH OF RED BANK TO 9 MILES
  NORTHWEST OF DENMARK...AND MOVING NORTHEAST AT 25 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE FIVE POINTS...FORT
  JACKSON...WOODFIELDS...WEST COLUMBIA...ST. MATTHEWS...SPRINGDALE...
  SOUTH CONGAREE...RED BANK...PINE RIDGE...ORANGEBURG...OAK GROVE...
  LEXINGTON...GASTON...FOREST ACRES...EASTOVER...COLUMBIA...CAYCE...
  BROOKDALE AND ARCADIA LAKES

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

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 3349 8134 3399 8129 3410 8075 3407 8072
      3410 8062 3408 8064 3408 8062 3407 8063
      3406 8061 3403 8060 3398 8064 3397 8062
      3392 8063 3389 8061 3389 8062 3340 8071
      3337 8107
TIME...MOT...LOC 0210Z 247DEG 22KT 3390 8118 3367 8115
          3338 8127

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 8:14 PM EDT, 1 hour 56 minutes earlier.

Area forecast discussion, Jun 21, 8:14 PM EDT, 1 hour 56 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
814 PM EDT TUE JUN 21 2011

.SYNOPSIS...
MUCH ABOVE NORMAL TEMPERATURES WILL CONTINUE FOR THE NEXT COUPLE
OF DAYS AS AN UPPER LEVEL RIDGE BUILDS ACROSS THE AREA. SLIGHT
COOLING IS EXPECTED FOR THE END OF THE WEEK AS THE THREAT OF
THUNDERSTORMS INCREASES.

&&

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
UPDATE...SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ACROSS THE CSRA
AND CONTINUE TO MOVE INTO THE WESTERN MIDLANDS. OTHER CONCERN WILL
BE FOR THE EASTERN MIDLANDS WHERE THE SEA BREEZE IS CURRENTLY
MOVING INTO BAMBERG...ORANGEBURG AND CLARENDON COUNTIES. THIS
COULD IGNITE SOME ADDITIONAL THUNDERSTORMS...HOWEVER BEST
INSTABILITY REMAINS OVER THE WESTERN AND CENTRAL MIDLANDS. WILL
ISSUE AN UPDATE TO BETTER REPRESENT THE CURRENT SITUATION.

PREVIOUS DISCUSSION...TEMPERATURES HAVE BEGUN TO SLOWLY COOL
ACROSS THE FORECAST AREA ALLOWING HEAT INDEX VALUES TO DROP BELOW
100 DEGREES. AS A RESULT HAVE CANCELED THE HEAT ADVISORY. SOME
SHOWERS AND THUNDERSTORMS HAVE BEGUN TO DEVELOP ACROSS THE
NORTHERN MIDLANDS AND CSRA...MAINLY ALONG OUTFLOW BOUNDARIES FROM
EARLIER CELLS. WILL ISSUE AN UPDATE TO REMOVE HEAT ADVISORY
WORDING AND ADJUST POPS AND CLOUDS. UPDATE OUT SHORTLY.

&&

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY/...
BY WEDNESDAY AN UPPER TROUGH OVER THE CENTRAL PLAINS BEGINS TO
MOVE EASTWARD HELPING TO FLATTEN THE UPPER RIDGE. WILL INCREASE
POPS TO LOW CHANCE MAINLY FOR THE AFTERNOON AND EVENING HOURS.
STILL QUITE WARM WEDNESDAY WITH HIGHS IN THE MID TO UPPER
90S...BUT LOWERING INTO THE LOWER 90S THURSDAY. A HEAT ADVISORY
MAY AGAIN BE NEEDED WEDNESDAY. OVERNIGHT LOWS IN THE LOWER TO
MIDDLE 70S.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
MEDIUM RANGE MODELS CONTINUE TO DEPICT AN UPPER TROUGH OVER THE
CENTRAL PART OF THE COUNTRY SLOWLY MOVING EAST. TROPICAL MOISTURE
MAY BEGIN TO STREAM INTO THE AREA FROM THE GULF OF MEXICO BY LATE
WEEK AS WELL. A COLD FRONT APPROACHES FROM THE NORTHWEST BY FRIDAY
BUT MODELS SUGGEST THAT THE FRONT WILL HAVE A TOUGH TIME GETTING
THROUGH OUR AREA...POSSIBLY STALLING INTO EARLY NEXT WEEK. WILL
CONTINUE THE MENTION OF CHANCE POPS THROUGH THE EXTENDED PERIOD.
MAX TEMPS GENERALLY IN THE LOWER 90S. OVERNIGHT LOWS REMAIN IN
THE LOWER TO MIDDLE 70S.

&&

.AVIATION /00Z WEDNESDAY THROUGH SUNDAY/...
THUNDERSTORMS ACTIVITY HAS QUICKLY ERUPTED EARLY THIS EVENING
ACROSS THE CSRA AND NORTHERN MIDLANDS. HAVE UPDATED TAFS TO
REFLECT THIS ACTIVITY. HIGHEST POTENTIAL FOR STORM WINDS EXISTS
WITH SEVERE STORMS CURRENTLY MOVING NEAR AGS/DNL. EXPECT TSRA
ACTIVITY TO WEAKEN AFTER 02/03Z. THERE STILL REMAINS SOME
UNCERTAINTY TO FOG TOMORROW MORNING BUT WITH CURRENT STORM
ACTIVITY HAVE INCLUDED IT INTO AGS/OGB SITES WHERE NAM MOS HAS
INDICATED BRIEF PERIOD OF MVFR FOG. WINDS PICK UP AFTER 22/18Z
FROM THE WEST-SOUTHWEST. FOR NOW HAVE LEFT OUT CB MENTION IN TAFS
FOR THE END OF THE TAF PERIOD DUE TO TIMING/LOCATION OF UPPER TROUGH
ARRIVING FROM THE WEST AND UNCERTAINTY IN STORM COVERAGE.

EXTENDED AVIATION OUTLOOK...SCATTERED AFTERNOON/EVENING CONVECTION
IS POSSIBLE WEDNESDAY THROUGH SATURDAY.

&&

.CAE WATCHES/WARNINGS/ADVISORIES...
SC...NONE.
GA...NONE.
&&

Hazardous weather outlook, Jun 21, 6:51 PM EDT, 3 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
651 PM EDT TUE JUN 21 2011

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-222300-
LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD-
MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON-
RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON-
BAMBERG-
651 PM EDT TUE JUN 21 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL GEORGIA AND
CENTRAL SOUTH CAROLINA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Local storm report, Jun 21, 8:45 PM EDT, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
845 PM EDT TUE JUN 21 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0834 PM     TSTM WND GST     7 SSE AUGUSTA           33.35N 81.97W
06/21/2011  E60 MPH          RICHMOND           GA   TRAINED SPOTTER

            SPOTTERNETWORK REPORT OF 60 MPH WINDS SOUTH OF AUGUSTA

&&

SMITH

Special weather statement, Jun 21, 9:04 PM EDT, 1 hour 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
904 PM EDT TUE JUN 21 2011

GAZ065-077-SCZ030-220130-
AIKEN-BURKE-RICHMOND-
904 PM EDT TUE JUN 21 2011

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF RICHMOND...BURKE...
BARNWELL AND AIKEN COUNTIES THROUGH 930 PM EDT...

AT 901 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM...10 MILES SOUTHWEST OF JACKSON...MOVING
NORTHEAST AT 30 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
GLOVERVILLE...AIKEN...CLEARWATER...JACKSON AND NEW ELLENTON...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
GUSTY WINDS OF 30 TO 40 MPH...
PEA SIZE HAIL...
FREQUENT CLOUD TO GROUND LIGHTNING...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3327 8208 3351 8196 3364 8174 3366 8162
      3344 8143 3329 8162 3308 8194
TIME...MOT...LOC 0105Z 241DEG 24KT 3325 8189

Local storm report, Jun 21, 9:10 PM EDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
910 PM EDT TUE JUN 21 2011

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0758 PM     HAIL             HEPHZIBAH               33.28N 82.11W
06/21/2011  E1.00 INCH       RICHMOND           GA   PUBLIC

            QUARTER SIZED HAIL IN HEPHZIBAH

&&

Local storm report, Jun 21, 9:31 PM EDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
931 PM EDT TUE JUN 21 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 PM     TSTM WND DMG     4 NNW SILVERSTREET      34.27N 81.75W
06/21/2011                   NEWBERRY           SC   LAW ENFORCEMENT

            TREES DOWN AT THE INTERSECTION OF ISLAND FORD RD AND
            BELLFAST RD.

&&

CL

Local storm report, Jun 21, 9:51 PM EDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
951 PM EDT TUE JUN 21 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0928 PM     TSTM WND DMG     5 ENE PROSPERITY        34.24N 81.46W
06/21/2011                   NEWBERRY           SC   LAW ENFORCEMENT

            NUMEROUS TREES DOWN ON INTERSTATE 26 BETWEEN MILE MARKERS
            80 AND 85.

&&

CL

Local storm report, Jun 21, 10:04 PM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1004 PM EDT TUE JUN 21 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0943 PM     TSTM WND DMG     8 NE WINNSBORO          34.47N 81.00W
06/21/2011                   FAIRFIELD          SC   LAW ENFORCEMENT

            TREES DOWN ON INTERSTATE 77 NEAR MILE MARKER 48

&&

CL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 8:10 PM EDT	Severe Thunderstorm Warning	CAE	Aiken	50 min
Jun 21, 8:56 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Lexington, Newberry, Richland, Saluda	49 min
Jun 21, 9:04 PM EDT	Special Weather Statement	CAE	Aiken	26 min
Jun 21, 9:32 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Calhoun, Lexington, Richland	43 min
Jun 21, 9:41 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster, Lexington, Richland	49 min
Jun 21, 10:29 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Kershaw, Lancaster	46 min
Jun 21, 10:41 PM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Lancaster, Lee, Richland, Sumter	34 min
Jun 21, 10:57 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Kershaw, Lee, Richland, Sumter	63 min
Jun 21, 11:13 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Lexington	47 min
Jun 21, 11:13 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield	32 min
Jun 21, 11:46 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield	44 min
Jun 22, 12:16 AM EDT	Special Weather Statement	CAE	Richland	44 min
Jun 22, 1:14 AM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Lee, Richland, Sumter	46 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.