mainly to trees and powerlines.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CAE wrote it up.
Scattered thunderstorms produced wind damage over the central Midlands and Pee Dee region...mainly to trees and powerlines.
The local office's own words before the first event, 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 the first event at Aug 11, 9:41 AM EST, 3 hours 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE COLUMBIA SC ISSUED BY NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 1041 AM EDT TUE AUG 11 2009 .SYNOPSIS... AN UPPER LEVEL RIDGE OF HIGH PRESSURE WILL WEAKEN AND SHIFT WEST THIS WEEK...WHILE AN UPPER LEVEL TROUGH DEVELOPS OVER THE REGION. THIS TROUGH...IN ADDITION TO INCREASING ATMOSPHERIC MOISTURE AND AN APPROACHING FRONTAL BOUNDARY...WILL INCREASE OUR RAIN CHANCES WEDNESDAY THROUGH FRIDAY. && .NEAR TERM /THROUGH TONIGHT/... SFC ANALYSIS AT 14Z INDICATES A TROF ACROSS THE NRN TIER OF THE FORECAST AREA. MESOSCALE MODELS SLIDE THE TROF SLOWLY EAST ACROSS THE MIDLANDS THROUGH THE AFTERNOON AND INTO THE EVENING. ALOFT...H5 RIDGE AXIS WILL CONTINUE TO PIVOT SOUTH...LEAVING THE CWA UNDER ZONAL FLOW BY 21Z. BASED ON OBS TRENDS AND LATEST MOS...HIGH TEMPERATURES SHOULD EASILY REACH THE U90S...A LITTLE LOWER THAN MONDAY. DEWPOINTS WILL LIKELY REMAIN IN THE U60S THIS AFTERNOON...YIELDING HEAT INDEX VALUES BETWEEN 100-103 FOR 2-3 HOURS THIS AFTERNOON. SFC CONVERGENCE WITHIN THE ADVANCING TROF AXIS MAY PROVIDE ENOUGH LIFT TO OVERCOME WEAK LLVL CIN BY MID AFTERNOON. BASED ON THE TIMING OF THE TROF...IT APPEAR THAT DEEP CONVECTION WILL INITIATE ALONG AND EAST OF I-20 BETWEEN 18-21Z. CONVECTIVE CLUSTERS AND OUTFLOW BOUNDARIES ORIGINATING OVER THE MTNS MAY ARRIVE OVER THE CWA BETWEEN 21-0Z...RESULTING IN ANOTHER WAVE OF SCT CONVECTION. I WILL FAVOR SCT COVERAGE OVER THE SAVANNAH RIVER VALLEY BETWEEN 18-21Z...INCREASING SCT COVERAGE ACROSS THE ENTIRE CWA BY 0Z. 12Z OBSERVED SOUNDINGS INDICATE VERY HIGH FZLVLS NEAR 16 KFT WITH WBZ OVER 13 KFT. MODERATE CAPE VALUES MAY SUPPORT ONE OR TWO HAIL EVENTS...HOWEVER...ISO WET MICROBURST APPEARS THE MOSTLY LIKELY THREAT WITH THESE TSRA. && .SHORT TERM /WEDNESDAY THROUGH FRIDAY/... OPERATIONAL MODELS ARE IN FAIR AGREEMENT IN LOWERING 500MB HEIGHTS OVER THE FORECAST AREA ON WEDNESDAY IN RESPONSE TO AN UPPER TROUGH MOVING INTO THE SOUTHERN OHIO VALLEY AND APPALACHIAN REGION. NAM IS A BIT MORE AGGRESSIVE AND CUTS OFF THE UPPER LOW BY WEDNESDAY EVENING THROUGH THURSDAY. EITHER WAY...THERE SHOULD BE INCREASED UPPER SUPPORT IN THE FORM OF SHORTWAVE ENERGY MOVING THROUGH THE BASE OF THE TROUGH OVER THE CAROLINAS WEDNESDAY THROUGH THURSDAY. A WEAK FRONTAL BOUNDARY WILL ALSO PUSH INTO THE PIEDMONT AND MIDLANDS AREA WEDNESDAY AFTERNOON...WHICH WILL PROVIDE A FOCUS FOR CONVECTIVE DEVELOPMENT. THE DEGREE TO WHICH THE ATMOSPHERE CAN DESTABILIZE BOTH DAYS WILL BE DEPENDENT ON THE AMOUNT OF CLOUD COVER...BUT THERE SHOULD BE SUFFICIENT INSTABILITY TO SUPPORT SCATTERED TO LIKELY COVERAGE OF SHOWERS AND THUNDERSTORMS. WILL INCREASE POPS TO LIKELY WEDNESDAY AFTERNOON AND EVENING ACROSS THE FORECAST AREA...THEN SHIFT THE LIKELY POPS TO THE EASTERN MIDLANDS ON THURSDAY AS THE DEEPER MOISTURE SHIFTS A BIT EAST WITH THE SURFACE BOUNDARY. TEMPERATURES SHOULD BE QUITE A BIT COOLER IN THE LOWER 90S. && .LONG TERM /FRIDAY NIGHT THROUGH MONDAY/... THE FRONTAL BOUNDARY APPEARS TO WASH OUT OVER THE REGION BY THE END OF THE WEEK...BUT ABUNDANT MOISTURE REMAINS OVER THE FORECAST AREA. WILL CONTINUE CHANCE POPS THROUGH THE EXTENDED PERIODS WITH INSTABILITY AND MOISTURE IN PLACE...DESPITE A SOLID TRIGGER FOR CONVECTION. THE UPPER RIDGE BUILDS BACK OVER THE AREA BY THE END OF THE PERIOD...WHICH SHOULD LOWER RAIN CHANCES A BIT...BUT NOT COMFORTABLE REMOVING POPS FROM THE FORECAST. TEMPERATURES WILL BE NEAR OR SLIGHTLY BELOW NORMAL. && .AVIATION /14Z TUESDAY THROUGH SATURDAY/... AFTER BRIEF MVFR VISIBILITIES AT AGS AND OGB THIS MORNING...EXPECT VFR CONDITIONS THROUGH THE TAF PERIOD. MOISTURE WILL BE ON THE INCREASE ACROSS THE REGION DURING THE DAY. WEAK LEE SIDE TROUGH WILL SETUP THIS AFTERNOON...WHICH MAY HELP TO FOCUS SCATTERED AFTERNOON THUNDERSTORMS...MAINLY AFTER 20Z. ACTIVITY MAY LAST INTO THE EVENING AND SHOULD END BY 03Z. CONFIDENCE NOT HIGH AT ANY TAF SITE...SO HAVE ONLY GONE CB IN TAFS FOR NOW. PERIODS OF MVFR VISIBILITIES MAY BE ENCOUNTERED IN SHOWERS AND THUNDERSTORMS ON WEDNESDAY. OTHERWISE...NO SIGNIFICANT IMPACTS EXPECTED DURING THE EXTENDED PERIOD. && .CAE WATCHES/WARNINGS/ADVISORIES... SC...NONE. GA...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE COLUMBIA SC ISSUED BY NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 1053 AM EDT TUE AUG 11 2009 GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-121500- LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD- MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON- RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON- BAMBERG- 1053 AM EDT TUE AUG 11 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL GEORGIA AND CENTRAL SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE THIS THIS AFTERNOON AND TONIGHT. SOME OF THESE THUNDERSTORMS COULD BECOME SEVERE AND PRODUCE DAMAGING WINDS...LARGE HAIL...HEAVY RAINFALL...AND DANGEROUS CLOUD TO GROUND LIGHTNING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP IN A WARM AND UNSTABLE AIRMASS DURING THE AFTERNOON HOURS ON WEDNESDAY AND THURSDAY. SOME STORMS MAY BE STRONG TO SEVERE...WITH THE MAIN THREATS BEING DAMAGING WINDS AND HAIL. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY.
The Columbia radar (KCAE), 77 km away, was scanning. The volume nearest the first event began at 17:46 UTC.
7 thunderstorm wind. Local standard time, as filed.
DOT reported a couple of trees down on Britton road off of hwy 521.
DOT reported trees down on hwy 645.
DOT reported several trees down in the vicinity of ELKO.
DOT reported several trees down on Partridge Lane road near US 378.
EM reported several trees and powerlines down around the town of Kershaw, especially on Country Club Bypass.
Sheriff reported trees and powerlines down from Chapin to Irmo.
Sheriff reported several trees down on hwy 283.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2009Every state in 2009This day in weather historyWarnings in South Carolina, August 2009
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 180333, 180341, 180342, 180352, 180354, 180345, 180348.