Areas of thunderstorms over the Midlands produced heavy rains that produced some street flooding. One storm also produced strong winds that took down trees and powerlines.
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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.
Areas of thunderstorms over the Midlands produced heavy rains that produced some street flooding. One storm also produced strong winds that took down 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 12, 1:18 PM EST, 3 hours 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE COLUMBIA SC 218 PM EDT TUE AUG 12 2014 .SYNOPSIS... AN UPPER TROUGH WILL PUSH INTO THE REGION OVERNIGHT AS A COLD FRONT CROSSES THE AREA AND STALLS EARLY WEDNESDAY MORNING. DRY AND WARM BUT LESS HUMID WEATHER IS EXPECTED THOUGH THE END OF THE WEEK. UNSETTLED WEATHER RETURNS TO THE REGION SUNDAY INTO EARLY NEXT WEEK. && .NEAR TERM /THROUGH TONIGHT/... THIS AFTERNOON...VISIBLE SATELLITE IMAGERY REVEALS TOWERING CUMULUS AND CUMULONIMBUS CLOUDS ACROSS THE FORECAST AREA IN A MOISTURE RICH ENVIRONMENT WITH PWAT VALUES OVER 2 INCHES AND DEWPOINTS IN THE LOWER 70S. REGIONAL RADAR SHOWS THUNDERSTORMS HAVE DEVELOPED ACROSS MUCH OF THE MIDLANDS AND CSRA AND INTO THE LOW COUNTRY WITH THE BEST COVERAGE OVER THE EASTERN MIDLANDS. SEVERE POTENTIAL APPEARS LOW GIVEN MARGINAL LAPSE RATES AND GENERALLY MOIST ADIABATIC THERMAL PROFILES...HOWEVER WATER VAPOR IMAGERY CONFIRMS DRIER AIR ALOFT MOVING INTO THE REGION LATE AFTERNOON AND THIS EVENING WHICH COULD ENHANCE A DAMAGING WIND GUST THREAT WITH THE STRONGEST OF STORMS. TONIGHT...AN UPPER TROUGH SLOWLY MOVING THROUGH THE GREAT LAKES AND OHIO VALLEY REGION WILL PUSH A COLD FRONT INTO THE REGION LATE TONIGHT. AFTERNOON AND EVENING CONVECTION SHOULD WANE WITH SUNSET BUT SOME LINGERING SHOWERS COULD BE AROUND AFTER MIDNIGHT UNTIL THE FRONT ARRIVES SO WILL HOLD ON TO SLIGHT CHANCE POPS UNTIL THEN. TEMPERATURES OVERNIGHT WILL SLOWLY FALL AHEAD OF THE FRONT WITH SOME CLOUDS AND WIND KEEPING THE BOUNDARY MIXED A BIT. CANNOT RULE OUT SOME LIGHT FOG DEVELOPMENT WITH POOLING OF MOISTURE JUST AHEAD OF THE FRONT AS WELL. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/... SURFACE TROUGH WILL BE ALONG THE COAST WEDNESDAY MORNING WITH THE UPPER LEVEL TROUGH AXIS CROSSING THE REGION. BY WEDNESDAY EVENING THE SURFACE TROUGH WILL SLIDE OFFSHORE WITH DRIER AIR OVERTAKING THE FORECAST AREA. WEAK HIGH PRESSURE WILL BEGIN MOVING INTO THE AREA WEDNESDAY NIGHT AND REMAIN OVER THE REGION THROUGH THURSDAY NIGHT. MODEL SOUNDINGS INDICATE PWAT VALUES DECREASING TO ONE INCH OR LESS BY LATE WEDNESDAY AFTERNOON AND REMAINING THERE THROUGH THURSDAY NIGHT. AS SUCH HAVE KEPT THE FORECAST DRY WITH MOSTLY CLEAR SKIES THROUGH THE PERIOD. TEMPERATURES WILL BE IN THE UPPER 80S TO LOWER 90S FOR DAYTIME HIGHS WITH OVERNIGHT LOWS IN THE MIDDLE 60S TO AROUND 70. && .LONG TERM /FRIDAY THROUGH MONDAY/... MODELS ARE IN GOOD AGREEMENT THROUGH THE LONG TERM WITH SOME MINOR TIMING AND INTENSITY DIFFERENCES LATE IN THE WEEKEND INTO EARLY NEXT WEEK. UPPER LEVEL PATTERN REMAINS HIGHLY AMPLIFIED AND WILL SLOWLY BECOME MORE ZONAL THROUGH THE WEEKEND AS A CUT OFF LOW OVER THE WEST COAST GETS EJECTED INTO THE FLOW. THIS WILL KEEP WEAK HIGH PRESSURE IN CONTROL OF THE AREA THROUGH SATURDAY WITH SLIGHT CHANCE POPS RETURNING TO THE CENTRAL AND EASTERN MIDLANDS AS THE SEA BREEZE TRIES TO WORK BACK INTO THE AREA AND OVERCOME THE DRY AIR. THE NEXT DISTURBANCE WILL MOVE INTO THE REGION SUNDAY INTO MONDAY AND WITH SOUTH TO SOUTHWESTERLY WINDS USHERING MOISTURE BACK INTO THE REGION CHANCES OF SHOWERS AND THUNDERSTORMS WILL BE INCREASING FOR SUNDAY AND MONDAY. TEMPERATURES THROUGH THE LONG TERM WILL BE NEAR NORMAL. && .AVIATION /18Z TUESDAY THROUGH SUNDAY/... SCATTERED CONVECTION UNDERWAY ACROSS THE AREA AHEAD OF AN APPROACHING COLD FRONT THAT WILL CROSS THE REGION EARLY WEDNESDAY MORNING. BEST THREAT FOR TSRA LOOKS TO BE OGB/AGS/DNL SO WILL INCLUDE A TEMPO GROUP FOR THUNDER WHILE CARRYING SHOWERS AT CAE/CUB AND AMEND AS NECESSARY. SOME MVFR FOG EXPECTED BEFORE DAWN WEDNESDAY MORNING DUE TO POOLING OF MOISTURE JUST AHEAD OF THE FRONT SO WILL INCLUDE A COUPLE OF HOURS OF FOG AT TERMINALS. SOUTHWESTERLY WINDS THIS AFTERNOON AROUND 6 TO 12 MPH WILL GRADUALLY SHIFT TO THE WEST AND NORTHWEST EARLY WEDNESDAY MORNING AS THE FRONT MOVES THROUGH. STRONG WIND GUSTS ASSOCIATED WITH THUNDERSTORMS ALSO POSSIBLE. EXTENDED AVIATION OUTLOOK...NO SIGNIFICANT RESTRICTIONS EXPECTED. && .CAE WATCHES/WARNINGS/ADVISORIES... SC...NONE. GA...NONE. && SYNOPSIS...HC NEAR TERM...HC SHORT TERM...MJP LONG TERM...MJP AVIATION...HC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE COLUMBIA SC 354 AM EDT TUE AUG 12 2014 GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-130800- LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD- MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON- RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON- BAMBERG- 354 AM EDT TUE AUG 12 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL GEORGIA AND CENTRAL SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. THUNDERSTORMS WITH HEAVY DOWNPOURS MAY OCCUR WITH LOCALIZED FLOODING POSSIBLE. A FEW OF THE THUNDERSTORMS THIS AFTERNOON AND EVENING COULD POSSIBLY CONTAIN DAMAGING WIND. .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.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE COLUMBIA SC 215 PM EDT TUE AUG 12 2014 SCZ031-036>038-121915- CALHOUN-CLARENDON-ORANGEBURG-SUMTER- 215 PM EDT TUE AUG 12 2014 ...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CALHOUN...SUMTER... CLARENDON AND ORANGEBURG COUNTIES THROUGH 315 PM EDT... AT 211 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM...NEAR CAMERON...MOVING EAST AT 20 MPH. SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE... ELLOREE AND SUMMERTON... PREPARE NOW FOR THE FOLLOWING HAZARDS... GUSTY WINDS OF 30 TO 40 MPH... FREQUENT CLOUD TO GROUND LIGHTNING... PRECAUTIONARY/PREPAREDNESS ACTIONS... THUNDERSTORMS POSE A VARIETY OF THREATS TO BOATERS ON LAKE MARION. YOUR BEST COURSE OF ACTION DURING A THUNDERSTORM IS TO SEEK SAFE HARBOR. IF YOU ARE CAUGHT IN THE OPEN LAKE WATERS...STAY BELOW DECK...AND IF POSSIBLE...AWAY FROM UNGROUNDED METAL OBJECTS. INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES. REPORT DAMAGING WINDS OR FLOODING TO YOUR COUNTY SHERIFF...OR USE WWW.FACEBOOK.COM/NWSCOLUMBIA AND EMAIL CAEWX@NOAA.GOV TO RELAY SEVERE WEATHER REPORTS. && LAT...LON 3341 8034 3354 8075 3370 8072 3375 8031 TIME...MOT...LOC 1814Z 260DEG 16KT 3361 8066 WRS
The Columbia radar (KCAE), 16 km away, was scanning. The volume nearest the first event began at 21:28 UTC.
6 heavy rain, 1 thunderstorm wind. Local standard time, as filed.
Sheriff reported trees and powerlines down at the intersection of Coldstream Drive and Brent Ford Road.
SCHP reported road flooding on Bush River road near I-26.
SCHP reported road flooding on Broad River road between St. Andrews and Irmo.
SCHP reported road flooding at the intersection of Bush River rd and Broad River road.
SCHP reported road flooding on Two Notch road east of Clemson road.
RCWINDS rain gage at Elders Pond measured 3.07 inches of rain in about an hour.
RCWINDS rain gage at Spring Valley High School measured 2.45 inches of rain in just over an hour.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2014Every state in 2014This day in weather historyWarnings in South Carolina, August 2014
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: 528740, 528734, 528735, 528736, 528737, 528738, 528739.