Alert archive / South Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 179, NWS Columbia, SC

June 21, 20115 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jun 21, 2011, 10:41 PM EDT for 5 counties in South Carolina. It was in force for 34 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: Jun 21, 2011, 10:41 PM EDT (02:41 UTC)
Expired: Jun 21, 2011, 11:15 PM EDT
In force: 34 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

Counties Kershaw County, SC, Lancaster County, SC, Lee County, SC, Richland County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 62 km from the middle of the area, began a volume at 02:44 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, 11:01 PM EDT	TSTM WND DMG	Camden, SC	TREES AND POWERLINES DOWN ACROSS THE LUGOFF AND CAMDEN 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 one storm report to this severe thunderstorm warning; the first came 20 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, 2.7 hours before the alert went out and 177 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.

291 
WUUS52 KCAE 220241
SVRCAE
SCC055-057-061-079-085-220315-
/O.NEW.KCAE.SV.W.0179.110622T0241Z-110622T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
1041 PM EDT TUE JUN 21 2011

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KERSHAW COUNTY IN CENTRAL SOUTH CAROLINA
  SOUTHWESTERN LANCASTER COUNTY IN CENTRAL SOUTH CAROLINA
  WESTERN LEE COUNTY IN CENTRAL SOUTH CAROLINA
  EASTERN RICHLAND COUNTY IN CENTRAL SOUTH CAROLINA
  NORTHWESTERN SUMTER COUNTY IN CENTRAL SOUTH CAROLINA

* UNTIL 1115 PM EDT

* AT 1039 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 12 MILES SOUTHWEST OF HEATH
  SPRINGS TO 12 MILES SOUTH OF LUGOFF...OR ALONG A LINE EXTENDING
  FROM 16 MILES NORTHWEST OF CAMDEN TO 15 MILES SOUTH OF CAMDEN...AND
  MOVING EAST AT 20 MPH.

* SOME COMMUNITIES IN THE WARNING AREA INCLUDE LUGOFF...HEATH SPRINGS
  AND CAMDEN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
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 3468 8068 3432 8059 3438 8033 3407 8030
      3400 8077 3427 8082 3438 8077 3441 8079
      3441 8082 3443 8086 3455 8088
TIME...MOT...LOC 0241Z 263DEG 18KT 3445 8077 3406 8066

$$

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, 10:34 PM EDT, 7 minutes earlier.

Area forecast discussion, Jun 21, 10:34 PM EDT, 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
1034 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...THUNDERSTORMS CONTINUE TO MARCH ACROSS THE AREA WITH SOME
CELLS REACHING SEVERE LIMITS...WITH THE MAIN REPORTS BEING WIND
DAMAGE. WITH MUCH OF REMAINING AREA SEEING OUTFLOW BOUNDARIES
INTERSECTING AND INITIATING NEW CONVECTION WILL UPDATE THE
FORECAST TO UP POPS AND CLOUDS OVER THE NEXT COUPLE OF HOURS.
UPDATE ALREADY OUT.

PREVIOUS DISCUSSION...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.

&&

.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 /03Z WEDNESDAY THROUGH SUNDAY/...
THUNDERSTORM ACTIVITY HAS SPREAD ACROSS THE MIDLANDS INCLUDING CAE/CUB
AS OF 22/03Z. THE STRONGEST THUNDERSTORM CLUSTERS FEATURE SMALL
HAIL AND WINDS UP TO 50 KNTS WITH CONTINUOUS LIGHTNING. CSRA IS
CLEAR NOW BUT WILL MONITOR FOR ANOTHER BATCH TO MOVE OVER SITES IN
THE NEXT 1 TO 2 HOURS. OGB MAY JUST SEE STORMS BRUSH TO THE NORTH.

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.
&&

AVIATION...SMITH

Hazardous weather outlook, Jun 21, 6:51 PM EDT, 3 hours 50 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, 9:51 PM EDT, 50 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, 37 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

Local storm report, Jun 21, 10:14 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1014 PM EDT TUE JUN 21 2011

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

0944 PM     TSTM WND DMG     9 S WINNSBORO           34.25N 81.07W
06/21/2011                   FAIRFIELD          SC   LAW ENFORCEMENT

            TREES DOWN AT THE INTERSECTION OF US 321 AND BROOM MILL
            RD.

&&

CL

Local storm report, Jun 21, 10:21 PM EDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1021 PM EDT TUE JUN 21 2011

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

0920 PM     TSTM WND DMG     4 NW LEXINGTON          34.03N 81.29W
06/21/2011                   LEXINGTON          SC   LAW ENFORCEMENT

            TREES DOWN AT INTERSECTION OF BEECHCRREK RD AND COUNTY
            LAKE DR.

&&

CL

Local storm report, Jun 21, 10:24 PM EDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1024 PM EDT TUE JUN 21 2011

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

1012 PM     TSTM WND DMG     8 SSW LANCASTER         34.62N 80.83W
06/21/2011                   LANCASTER          SC   LAW ENFORCEMENT

            TREES DOWN ACROSS WEST END OF COUNTY REPORTED BY
            SHERRIFFS DISPATCH

&&

SMITH

Local storm report, Jun 21, 10:38 PM EDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1038 PM EDT TUE JUN 21 2011

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

1022 PM     TSTM WND DMG     6 NE SWANSEA            33.80N 81.03W
06/21/2011                   CALHOUN            SC   NWS EMPLOYEE

            SEVERAL LIMBS DOWN NEAR SWANSEA. ALSO 1/2 INCH HAIL.

&&

MJP

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, 10:10 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Calhoun, Lexington, Orangeburg, Richland	50 min
Jun 21, 10:29 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Kershaw, Lancaster	46 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.