A stationary complex of thunderstorms dropped 3 to 4 inches of rain in around an hour's time. Three roads were closed due to flooding, though it was difficult to determine if any creeks were involved.
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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 GSP wrote it up.
A stationary complex of thunderstorms dropped 3 to 4 inches of rain in around an hour's time. Three roads were closed due to flooding, though it was difficult to determine if any creeks were involved.
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 Greenville-Spartanburg, SC wrote its last area forecast discussion before the first event at Aug 29, 1:34 PM EST, 1 hour 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 234 PM EDT WED AUG 29 2012 .SYNOPSIS... A SURFACE BOUNDARY WILL PUSH SOUTH OF THE AREA TONIGHT INTO THURSDAY. HIGH PRESSURE WILL THEN BUILD IN FROM THE NORTH AND WEAKEN THROUGH THE WEEKEND. A COLD FRONT IS EXPECT TO APPROACH THE AREA EARLY NEXT WEEK. && .NEAR TERM /THROUGH THURSDAY/... AS OF 230 PM EDT...LESS UPPER LEVEL SUPPORT TONIGHT AND THURSDAY AS UPPER JET MAX SHIFTS SOUTHEAST AND LEAVES CWA IN THE UNFAVORABLE LEFT ENTRANCE REGION. ASSOCIATED TROUGH MOVES OFF TOWARD THE EAST ALLOWING MID-UPPER ANTICYCLONE TO PUSH IN BEHIND IT. THIS SHOULD HELP THE SURFACE FRONT PRESENTLY FIXED ACROSS THE CWA PUSH SOUTHWARD BY LATE TONIGHT. PER 12Z NAM/GFS 1000-850MB RH...A FAIR AMOUNT OF LOW LEVEL MOISTURE DOES REMAIN BEHIND THE FRONT SO DOUBT WE WILL SEE A REMARKABLE AMOUNT OF CLEARING...THOUGH THE LOW LEVEL CONVERGENCE WILL DIMINISH WHICH WILL LEAD TO LOWER POPS. WITH COOLING/DRYING ALOFT...CAPE WILL EASILY BE HIGH ENOUGH TO FOSTER SOME DIURNAL CONVECTION PARTICULARLY OVER THE MOUNTAINS. PLUS SOUTHERLY WINDS WILL ALSO PROMOTE SOME UPSLOPE IN GA/SC. KEPT SLIGHT CHANCES IN THE FORECAST IN THESE AREAS. && .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/... AS OF 2 PM WEDNESDAY...NHC FORECAST TRACKS ISSAC ALONG THE RED RIVER VALLEY ON THU INTO AR AND MO ON FRI. MODEL CONSENSUS IS LEFT OF THE OFFICIAL FORECAST...TAKING THE CENTER OF ISSAC OVER THE ARKLATX/OK REGION ON FRI. IN EITHER CASE...A BACK DOOR COLD FRONT WILL LIKELY REMAIN SOUTH OF THE FORECAST AREA...ALLOWING DRIER AIR TO SLIDE SOUTHWEST ACROSS THE CWA. SFC DEWPOINTS MAY MIX DOWN INTO THE MID 60S. ALOFT...THE GFS AND ECMWF MAINTAINS A H594 DAM RIDGE OVER THE SOUTHEAST. PARTLY SUNNY AFTERNOON CONDITIONS COMBINED WITH MILD LLVL THICKNESSES SHOULD SUPPORT HIGH TEMPERATURES FROM THE L80S ACROSS THE MTN VALLEYS TO U80S TO NEAR 90 EAST OF THE MTNS. FORECAST SOUNDINGS DURING THE HEAT OF THE DAY...KEEP A SHALLOW LAYER OF CIN AND LIMIT CAPE VALUES TO LESS THAN 500 J/KG. THE TEMPERATURE AND MOISTURE PROFILES SHOULD KEEP AFTERNOON SHRA/TSRA LIMITED TO A CHC ACROSS THE WESTERN NC MTNS AND SCHC ACROSS THE FTHILLS...DRY EAST. CONVECTION SHOULD DISSIPATE DURING THE EVENING...BUT A FEW SHRAS MAY LINGER ACROSS THE HIGHER TERRAIN OVERNIGHT. LOW TEMPERATURES MAY RANGE A COUPLE OF DEGREES ABOVE NORMAL. ON SATURDAY...THE CENTER OF ISSAC/S CIRCULATION SHOULD TRACK ACROSS MO AND IL. AS THE REMNANTS OF ISSAC PUSHES EAST...HEIGHTS DECREASE OVER THE CWA AND PW VALUES INCREASE THROUGH THE DAY. THE ENVIRONMENT BECOMES WEAKLY UNSTABLE DURING THE AFTERNOON...LLVL CIN BECOMES VERY SHALLOW TO NEAR ZERO. BASED ON THE MOISTURE AND INSTABILITY...IT APPEARS THAT CONVECTION WILL DEVELOP ACROSS THE MTNS DURING THE MID DAY...THEN SPREAD EAST DURING THE AFTERNOON AND EVENING. I WILL FORECAST POPS AROUND 40 ACROSS THE MTNS TO AROUND 30 EAST. HIGH TEMPERATURES SHOULD VERIFY CLOSE TO FRIDAY/S VALUES. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... AS OF 130 PM WEDNESDAY...THE REMNANTS OF TC ISSAC WILL BE WITHIN THE MEAN ULVL W/LY FLOW AT THE BEGINNING OF THE PERIOD...HOWEVER THE TRANSITION EAST WILL BE RELATIVELY SLOW THROUGH THE NEXT FEW DAYS. THE OP MODELS AGREE FAIRLY WELL WITH PLACEMENT OF THE SYSTEM AT 00Z SUN...HOWEVER THERE ARE SOME TIMING DIFFERENCES WITH EVENTUAL TRACK TOWARD AND EAST OF THE CWFA. THE 00Z ECMWF IS A SLOWER SOLN AS THE UPPER LOW CLOSES OFF...WHILE THE 12Z GFS KEEPS AN OPEN WAVE AND IS ABOUT 12 TO 15 HRS QUICKER. THIS IS DUE TO THE DIFFERENCES IN DOWNSTREAM BLOCKING AND THE FACT THE ULVL LOW/TROF WILL BE COJOINED WITH A N/LY RIDGE SYSTEM...OR A REX LIKE PATTERN. IN ANY REGARD...MOST OF THE EXT PERIOD LOOKS TO REMAIN ACTIVE WRT PRECIP AS HIGH AMOUNTS OF LLVL THETA/E AND OVERALL HIGH LEVELS OF PWATS ADVECT INTO THE AREA FROM THE SW EARLY SUN. THERE WILL ALSO BE SOME MEASURE OF UPPER DPVA ASSOCIATED WITH THE TROF AXIS APPROACHING THE AREA WHICH WILL PROVIDE SOME MODERATE LIFT. THE LLVLS WILL FEATURE INCREASING ISENTROP LIFT AND A WEAK PREFRONTAL TROF PERSISTING INTO TUE. THUS...THE GOING POPS WERE ADJ UP A BIT INTO THE HIGHER CHANCE RANGE BEGINNING SUN AFTERNOON THROUGH MON. THE MODELS HAVE BEEN RATHER CONSISTENT RUN TO RUN LATELY WITH THE SATURATED PROFILES FOR LATE SUN THROUGH MON AS WELL...AND A PERIODIC HEAVY PRECIP THREAT IS STILL POSSIBLE. YET ITS TOO EARLY TO TELL WHICH AREAS MAY BE MORE THREATENED THAN OTHERS ATTM. SIGFNT UNCERTAINTY EXISTS WITH THE FROPA AS THE GFS CLEARS THINGS OUT BY TUE AFTERNOON...WHILE THE ECMWF IS ABOUT 12 HRS SLOWER. ALSO...THERE IS NO REAL AIRMASS CHANGE OR STRONG HIPRES BEHIND THIS SYSTEM...SO THE POTENTIAL FOR THE SFC FRONT TO SLOW OR STALL REMAINS A POSSIBILITY. POPS WERE THEREFORE KEPT AT LOW END CHANCE ACROSS THE ERN ZONES UNTIL WED MORNING. MAX TEMPS COULD BE TRICKY WITH AREAS OF DIFFERENTIAL HEATING SUN...BUT FOR NOW HAVE STAYED CLOSE TO CLIMO. A COUPLE DEGREES COOLER IS ADVERTISED FOR MON AND TUE WITH THE EXPECTED HIGH CLOUD COVER AND MODERATE PRECIP COVERAGE. A REBOUND IS EXPECTED WED IF THE FROPA OCCURS...BRINGING MAXES BACK TO NORMAL LEVELS IN GOOD INSOLATION. && .AVIATION /19Z WEDNESDAY THROUGH MONDAY/... AT KCLT...LINE OF SHRA DEVELOPING IN WEAK LOW LEVEL CONVERGENCE ZONE NEAR NC/SC BORDER. A FEW CELLS WITHIN THE LINE ARE PRODUCING IFR VSBYS WITH +RA...BUT THERE IS NOT A GREAT DEAL OF LIGHTNING ACTIVITY ATTM. WENT WITH PREVAILING SHOWERS THIS AFTERNOON AND A TEMPO FOR THUNDER SINCE THERE IS ENOUGH INSTABILITY TO SUPPORT A DECENT AMOUNT OF THUNDER. THE STRONGER ACTIVITY IS DIURNALLY DRIVEN AND WILL DIMINISH BY EARLY EVENING. THERE IS A CHANCE FOR SHOWERS TO CONTINUE OVERNIGHT BUT NOT CONFIDENT ENOUGH THEY WILL AFFECT THE AIRFIELD TO INCLUDE IN TAF. FOR THU MORNING...NOT CURRENTLY ANTICIPATING A SIGNIFICANT DROP IN CIG/VSBY BUT SOME GUIDANCE WAS HINTING AT POSSIBILITY. WILL BRIEF INCOMING SHIFT TO KEEP THIS IN MIND. ELSEWHERE...DIURNAL SHOWERS/STORMS WILL CONTINUE ACROSS THE AREA BUT MAINLY OVER THE UPSTATE. SOME CONVECTION IS ALREADY ONGOING OVER THE MOUNTAINS BUT AT THE PRESENT TIME IT IS PRETTY WEAK. INCLUDED VCTS THIS AFTERNOON DUE TO SPORADIC NATURE OF THUNDER. TRIED TO INDICATE WEAKENING TREND IN CONVECTION BY GOING TO VCSH BY EARLY EVENING. LATE TONIGHT MOUNTAIN VALLEY FOG IS EXPECTED TO FORM AND THIS IS REFLECTED AT KAVL. OUTLOOK...TROPICAL MOISTURE WILL LINGER BEHIND A FRONTAL BOUNDARY JUST SOUTH OF THE AREA...LEAVING SLIGHT PRECIPITATION CHANCES FOR MUCH OF THE REMAINDER OF THE WEEK. AN EXPERIMENTAL AVIATION FORECAST CONSISTENCY TABLE SHOWING THE PERCENTAGE OF GUIDANCE MEMBERS AGREEING WITH THE SCHEDULED ISSUANCE CATEGORY IS AVAILABLE AT FOLLOWING LINK (USE LOWER CASE)... WWW.WEATHER.GOV/GSP/AVIATION/TABLES.HTM && .GSP WATCHES/WARNINGS/ADVISORIES... GA...NONE. NC...NONE. SC...NONE. && SYNOPSIS...SBK NEAR TERM...JW SHORT TERM...NED LONG TERM...SBK AVIATION...JW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 323 PM EDT WED AUG 29 2012 GAZ010-017-018-026-028-029-NCZ033-048>053-058-059-062>065-068>072- 082-507>510-SCZ001>014-019-301930- RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-ELBERT-AVERY-MADISON-YANCEY- MITCHELL-SWAIN-HAYWOOD-BUNCOMBE-GRAHAM-NORTHERN JACKSON-MACON- SOUTHERN JACKSON-TRANSYLVANIA-HENDERSON-CLEVELAND-LINCOLN-GASTON- MECKLENBURG-CABARRUS-UNION NC-RUTHERFORD MOUNTAINS- GREATER RUTHERFORD-POLK MOUNTAINS-EASTERN POLK-OCONEE MOUNTAINS- PICKENS MOUNTAINS-GREENVILLE MOUNTAINS-GREATER OCONEE- GREATER PICKENS-GREATER GREENVILLE-SPARTANBURG-CHEROKEE-YORK- ANDERSON-ABBEVILLE-LAURENS-UNION SC-CHESTER-GREENWOOD- 323 PM EDT WED AUG 29 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...PIEDMONT NORTH CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA. .DAY ONE...THIS AFTERNOON AND TONIGHT. NUMEROUS TO SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE REGION THROUGH THE EARLY EVENING HOURS. THE GREATEST COVERAGE WILL LIKELY REMAIN SOUTH OF THE INTERSTATE 40 CORRIDOR. THE PRIMARY THREATS WITH THESE STORMS WILL BE LOCALIZED TORRENTIAL RAINFALL AND CLOUD TO GROUND LIGHTNING. FLOODING IS POSSIBLE WITHIN URBAN AND POOR DRAINAGE AREAS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... NONE. NCZ035>037-056-057-501>506-301930- ALEXANDER-IREDELL-DAVIE-CATAWBA-ROWAN-CALDWELL MOUNTAINS- GREATER CALDWELL-BURKE MOUNTAINS-GREATER BURKE-MCDOWELL MOUNTAINS- EASTERN MCDOWELL- 323 PM EDT WED AUG 29 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PIEDMONT NORTH CAROLINA AND WESTERN NORTH CAROLINA. .DAY ONE...THIS AFTERNOON AND TONIGHT. SCATTERED TO ISOLATED SHOWERS AND THUNDERSTORMS WILL REMAIN ACROSS THE AREA THROUGH EARLY THIS EVENING. OCCASIONAL CLOUD TO GROUND LIGHTNING ARE POSSIBLE WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... NONE. NED
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 216 PM EDT WED AUG 29 2012 NCZ082-291900- UNION- 216 PM EDT WED AUG 29 2012 ...A STRONG THUNDERSTORM WILL AFFECT CENTRAL UNION COUNTY THROUGH 300 PM EDT... AT 207 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 4 MILES NORTHWEST OF WINGATE...OR 4 MILES NORTHEAST OF MONROE...MOVING SOUTH AT 5 MPH. OTHER STORMS ARE DROPPING VERY HEAVY RAIN BETWEEN MONROE AND THE ANSON COUNTY LINE. RADAR ESTIMATES THAT UP TO TWO INCHES OF RAIN HAS FALLEN IN THIS AREA. THIS STORM WILL IMPACT LOCATIONS NEAR... MONROE... WINGATE... WIND GUSTS UP TO 40 MPH...AND TORRENTIAL RAIN ARE EXPECTED WITH THIS STORM. HEAVY RAINS MAY FLOOD AREAS WITH POOR DRAINAGE...SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE RAPIDLY. SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. LAT...LON 3490 8031 3498 8057 3510 8062 3510 8029 MCAVOY
The Columbia radar (KCAE), 140 km away, was scanning. The volume nearest the first event began at 19:57 UTC.
2 flash flood. Local standard time, as filed.
East Lawyers Road was flooded between the intersections of Morgan Mill Road and Honeycutt Simpson Road. Flooding was reported near the intersection of Sikes Mill Road and Love Mill Road.
McIntyre Road was closed due to flooding about 5 miles east of Monroe.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in North Carolina in 2012Every state in 2012This day in weather historyWarnings in North Carolina, August 2012
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: 409464, 409465.