Heavy rain produced localized street flooding in Horry County.
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 ILM wrote it up.
Heavy rain produced localized street flooding in Horry County.
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 Wilmington, NC wrote its last area forecast discussion before the first event at Aug 27, 12:00 PM EST, 1 hour 31 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON NC 100 PM EDT MON AUG 27 2012 .SYNOPSIS... HIGH PRESSURE NORTH OF THE AREA WILL WEAKEN AND MOVE OFFSHORE TODAY. ISAAC IS EXPECTED TO BECOME A HURRICANE AS IT MOVES INTO THE CENTRAL GULF OF MEXICO...MAKING LANDFALL IN COASTAL MISSISSIPPI OR SOUTHEAST LOUISIANA EARLY WEDNESDAY MORNING. ALTHOUGH ISAAC WILL NOT DIRECTLY AFFECT THE EASTERN CAROLINAS...AN INCREASE IN TROPICAL MOISTURE FROM THE EAST AND SOUTH MAY BRING INCREASINGLY WET AND UNSETTLED WEATHER THIS WEEK. && .NEAR TERM /THROUGH TONIGHT/... AS OF 1 PM MONDAY...SHOWERS AND ISOLATED TSTMS WILL LIKELY FOLLOW THE PRONOUNCED LOW-LEVEL CONVERGENCE ASSOCIATED WITH THE ADVANCING SEA BREEZE FRONT FOR THE REST OF THIS AFTERNOON. OTHERWISE WE MAY BE RELYING ON OUTFLOW BOUNDARIES THROUGH THE REMAINDER OF THE DAY TO TRIGGER CONVECTION OUTSIDE OF THIS FEATURE. AS A RESULT HAVE TRIMMED POP VALUES EAST OF THE SEA BREEZE FRONT TO ISOLATED...AND BUT HIGH SCATTERED TO ALMOST LIKELY WEST OF THIS NW MOVING BOUNDARY. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... AS OF 3 AM MONDAY...WHILE IT APPEARS LIKELY THAT TROPICAL STORM ISAAC WILL NOT HAVE A DIRECT IMPACT ON THE REGION THE MOISTURE PLUME ASSOCIATED WITH THE STORM WILL BRING INCREASED PRECIP CHANCES THROUGH THE PERIOD. DEEP MOISTURE...PRECIPITABLE WATER VALUES WILL BE NEAR 2.25 INCH FOR MUCH OF THE PERIOD...ALONG WITH DIVERGENT FLOW ALOFT AND WEAK SURFACE CONVERGENCE SHOULD PRODUCE AN ENVIRONMENT SUPPORTIVE OF WIDESPREAD PRECIP WHICH WILL BE HEAVY AT TIMES. STORM MOTIONS AROUND 10 KT SHOULD LIMIT THE THREAT OF INDIVIDUAL STORMS CAUSING FLOODING...BUT TRAINING COULD LEAD TO EXCESSIVE RAINFALL IN A RELATIVELY SHORT PERIOD OF TIME. IT IS WORTH NOTING THAT HPC IS SHOWING TOTAL QPF THROUGH THE PERIOD IN THE RANGE OF 2 TO 4 INCHES. ALTHOUGH UNCERTAINTY IN THE FORECAST CONTINUES TO RUN ON THE HIGH SIDE DO HAVE ENOUGH CONFIDENCE TO CARRY LIKELY POP FOR PARTS OF THE PERIOD...ESPECIALLY EARLY. RAIN TUE SEEMS LIKE A GOOD BET...BUT COVERAGE REMAINS A QUESTION MARK. WED/WED NIGHT IS TRICKIER. A WEAK FRONT DROPS IN FROM THE WEST-NORTHWEST WED ENHANCING LOW LEVEL CONVERGENCE. THE REMNANTS OF ISAAC ARE LIKELY TO PLAY A BIG ROLE IN WHAT HAPPENS...AS WILL THE EVOLUTION OF THE UPPER PATTERN WHICH REMAINS THE BIGGEST QUESTION MARK. FOR NOW WILL GO LIKELY WED POP WITH HIGH CHANCE WED NIGHT GIVEN THE SIGNIFICANT AMOUNT OF UNCERTAINTY. CLOUD COVER AND SHOWERS/RAIN WILL KEEP HIGHS IN THE LOW 80S AT BEST...THOUGH SOME AREAS WITH PROLONGED HEAVY RAIN MAY END UP TOPPING OUT IN THE UPPER 70S. THESE FACTORS WILL HELP KEEP LOWS IN THE LOWER 70S BOTH NIGHTS. && .LONG TERM /THURSDAY THROUGH SUNDAY/... AS OF 3 AM MONDAY...MEDIUM RANGE GUIDANCE CONTINUES TO GIVE MIXED SIGNALS...BUT THERE ARE A FEW TRENDS EMERGING. ALTHOUGH THE ULTIMATE PATH OF THE REMNANTS OF ISAAC REMAINS IN QUESTION THE MEDIUM RANGE GUIDANCE DOES SHOW A DRYING TREND LATE IN THE WEEK. THE AMOUNT OF DRYING VARIES...WITH THE 00Z GFS GOING BONE DRY WHILE THE 12Z ECMWF SHOWS ONLY A SLIGHT REDUCTION IN MOISTURE THROUGH THE WEEKEND. THE DIFFERENCE IS DUE TO THE HANDLING OF THE UPPER PATTERN OVER THE CONUS. ECMWF HAS DEEPER 5H TROUGHING OVER THE EASTERN PART OF THE COUNTRY. THE MORE AMPLIFIED PATTERN LEADS TO SLOWER EASTWARD PROGRESSION OF 5H RIDGE OVER THE CENTRAL US. BOTH GFS/ECMWF HAVE THE 5H TROUGH LEAVING ISAAC BEHIND...BUT STRONGER 5H TROUGH OF THE ECMWF TEMPORARILY CAPTURES ISAAC...PULLING THE STORM INTO THE FL PANHANDLE INSTEAD OF INTO LA LIKE THE GFS. INTERESTINGLY THE 00Z CANADIAN IS VERY SIMILAR TO A COMPROMISE SOLUTION BETWEEN THE GFS/ECMWF AND IN LINE WITH PREVIOUS FORECAST. ONLY PLAN MINOR CHANGES TO PREVIOUS FORECAST GIVEN THE CONTINUED LOW CONFIDENCE. HIGHS START OUT A DEGREE OR TWO BELOW CLIMO WITH CLOUDS AND PRECIP EXPECTED FOR THU. DECREASE IN POP WILL LEAD TO HIGHS INCREASING THROUGH THE PERIOD...ENDING UP NEAR TO ABOVE CLIMO FOR THE WEEKEND. LOWS WILL BE NEAR CLIMO THROUGH THE PERIOD. && .AVIATION /18Z MONDAY THROUGH FRIDAY/... AS OF 17Z...DECENT CONVECTION ALREADY FIRING ALONG THE RESULTANT. THE HIGH PWATS ARE NEAR THE COAST...BUT DRIFTING WESTWARD. LOOK FOR MOST OF THE CONVECTION TO BE WEST OF THE COASTAL TERMINALS BY 19Z...AFFECTING THE INLAND TERMINALS UNTIL 22Z. TONIGHT...THE MODELS (THE NAM IN PARTICULAR) CONTINUE TO ADVERTISE INCREASING MOISTURE AS AN OLD FRONTAL BOUNDARY THAT IS ATTACHED TO TROPICAL MOISTURE EXTENDING FROM ISAAC DRIFTS NORTHWARD. LOOK FOR SHOWERS TOWARDS MORNING...RIDING UP FROM THE SOUTHEAST. CEILINGS WILL LOWER TO MVFR...POSSIBLY IFR INLAND...WITH REDUCED VISIBILITIES IN SHOWERS. EXTENDED OUTLOOK...SCATTERED/NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS TUESDAY THROUGH WEDNESDAY. VFR DEVELOPING THURSDAY...CONTINUING THROUGH SATURDAY. && .MARINE... NEAR TERM /THROUGH TONIGHT/... AS OF 949 AM MONDAY...INVERTED SFC TROF ALONG AND PARALLEL TO THE CAROLINA COASTS THIS MORNING...WILL GET DRAWN INLAND TODAY AND TONIGHT AS ISAAC PUSHES FURTHER INTO THE GULF OF MEXICO. PROGGED SFC PRESSURE PATTERN AND GRADIENT WILL SUPPORT E TO SE WINDS AT 10 TO 15 KT THROUGHOUT THE NEAR TERM PERIOD. SEAS WILL PRIMARILY BE A FUNCTION OF A MODERATING ISAAC ROUGHLY 4 FT SE SWELL AFFECTING THE ILM WATERS. LOOK FOR ONLY A SMALL CONTRIBUTION FROM WIND DRIVEN WAVES...AND WHEN TALLIED WITH THE SE SWELL...SIGNIFICANT SEAS WILL RANGE BETWEEN 3 AND 5 FT...HIGHEST OFFSHORE. SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... AS OF 3 AM MONDAY...SOUTHERLY FLOW TUE/TUE NIGHT WILL BECOME HIGHLY VARIABLE WED AS WEAK FRONT DROPS INTO THE AREA FROM THE NORTHWEST. BOUNDARY STALLS CLOSE TO THE COAST WITH A WESTERLY COMPONENT DEVELOPING BEHIND IT. GRADIENT STAYS ON THE WEEK SIDE...KEEPING SPEEDS AROUND 10 KT THROUGH THE PERIOD. SEAS 3 TO 4 FT A COMBINATION OF SOUTHEAST SWELL AND SOUTHERLY WIND WAVE. LONG TERM /THURSDAY THROUGH FRIDAY/... AS OF 3 AM MONDAY...PRESENCE OF WEAK SURFACE FRONT IN THE REGION THU AND FRI LEADS TO A TRICKY WIND FORECAST. GRADIENT WILL BE VERY LIGHT WITH SPEEDS GENERALLY 10 KT OR LESS WITH A SOUTHERLY COMPONENT. HOWEVER...IF THE SURFACE BOUNDARY SHOULD HAPPEN TO SHIFT FARTHER OFF THE COAST WINDS COULD POTENTIALLY SHIFT TO ALMOST ANY DIRECTION. SEAS WILL RUN 2 TO 4 FT MAINLY AS A SE SWELL. && .ILM WATCHES/WARNINGS/ADVISORIES... SC...NONE. NC...NONE. MARINE...NONE. && NEAR TERM PUBLIC...MJC NEAR TERM MARINE...DCH/8 SHORT TERM...III LONG TERM...III AVIATION...43
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON NC 319 AM EDT MON AUG 27 2012 AMZ250-252-254-256-281000- SURF CITY TO CAPE FEAR NC OUT 20 NM- CAPE FEAR NC TO LITTLE RIVER INLET SC OUT 20 NM- LITTLE RIVER INLET TO MURRELLS INLET SC OUT 20 NM- MURRELLS INLET TO SOUTH SANTEE RIVER SC OUT 20 NM- 319 AM EDT MON AUG 27 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NCZ087-096-099-105-107-109-SCZ017-023-024-032-033-039-053-055-281000- ROBESON-BLADEN-COLUMBUS-INLAND PENDER-INLAND NEW HANOVER- INLAND BRUNSWICK-MARLBORO-DARLINGTON-DILLON-FLORENCE-MARION- WILLIAMSBURG-INLAND HORRY-INLAND GEORGETOWN- 319 AM EDT MON AUG 27 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NORTH CAROLINA AND NORTHEAST SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. POSSIBLE SIGNIFICANT RAINFALL ASSOCIATED WITH ISAAC THROUGH UPCOMING WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. NCZ106-108-110-SCZ054-056-281000- COASTAL PENDER-COASTAL NEW HANOVER-COASTAL BRUNSWICK-COASTAL HORRY- COASTAL GEORGETOWN- 319 AM EDT MON AUG 27 2012 ...MODERATE RISK OF RIP CURRENTS IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NORTH CAROLINA AND NORTHEAST SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. MODERATE RISK OF RIP CURRENTS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. 11
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
135 PM EDT MON AUG 27 2012
SCZ033-053-271830-
INLAND HORRY-MARION-
135 PM EDT MON AUG 27 2012
...A STRONG THUNDERSTORM WILL MOVE ACROSS HORRY AND MARION COUNTIES
THROUGH 230 PM EDT...
AT 135 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM ABOUT
9 MILES NORTH OF CONWAY...MOVING NORTHWEST AT 10 MPH.
SOME LOCATIONS IMPACTED INCLUDE MULLINS...ADRIAN...ALLSBROOK...
BAYBORO...BRITTON NECK...GALIVANTS FERRY...GAPWAY...GRESHAM...
HOMEWOOD...HORRY...RAINS AND SMITHBORO.
HAZARDS INCLUDE...
GUSTY WINDS OF 30 TO 40 MPH.
FREQUENT CLOUD TO GROUND LIGHTNING.
HEAVY RAINFALL AND MINOR FLOODING.
THIS STORM WILL PRODUCE HEAVY RAINFALL...WHICH WILL CAUSE MINOR
FLOODING OF LOW LYING AREAS INCLUDING DITCHES...CREEKS...ROADWAYS AND
AREAS OF POOR DRAINAGE. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS. MOTORISTS SHOULD ALSO REDUCE DRIVING SPEEDS TO AVOID
HYDROPLANING.
THUNDERSTORMS CAN POSE A VARIETY OF THREATS INCLUDING GUSTY WINDS...
SMALL HAIL...CLOUD TO GROUND LIGHTNING...AND LOCALIZED FLOODING. IT
IS RECOMMENDED THAT YOU REMAIN INDOORS UNTIL THE STORMS PASS.
&&
LAT...LON 3428 7929 3426 7925 3403 7894 3384 7907
3391 7945 3393 7945 3392 7946 3394 7949
3395 7949 3396 7948 3398 7950 3399 7951
TIME...MOT...LOC 1735Z 115DEG 14KT 3398 7912
WEISSThe national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
South Carolina State Road 19 was closed due to flooding near Barts Road.
Pee Dee Road was closed due to flooding near Jordanville Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2012Every state in 2012This day in weather historyWarnings in South 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: 410370, 410371.