A shortwave shifted over the southeastern United States during the day. Thunderstorms developed as this shortwave encountered deep moisture near a lingering trough of low pressure along the southeast coast.
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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 CHS wrote it up.
A shortwave shifted over the southeastern United States during the day. Thunderstorms developed as this shortwave encountered deep moisture near a lingering trough of low pressure along the southeast coast.
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 Charleston, SC wrote its last area forecast discussion before the first event at Jun 13, 12:48 PM EST, 1 hour 44 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHARLESTON SC 148 PM EDT WED JUN 13 2012 .SYNOPSIS... A TROUGH OF LOW PRESSURE WILL LINGER ACROSS THE AREA TODAY BEFORE A COLD FRONT PUSHES THROUGH TONIGHT. DRIER HIGH PRESSURE WILL THEN BUILD INTO THE REGION FROM THE NORTH THURSDAY AND PERSIST ACROSS THE AREA INTO THE MIDDLE OF NEXT WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... STILL MOSTLY DRY ACROSS THE AREA AS OF EARLY AFTERNOON BUT STILL THINK SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP AND LINGER INTO EARLY EVENING SO NO MAJOR CHANGES WERE MADE TO THE PREVIOUS FORECAST. MOST MODEL GUIDANCE SUGGEST THE CONVECTION WILL FOCUS ALONG THE SURFACE TROUGH/SEA BREEZE AROUND THE CHARLESTON TRI- COUNTY AREA AND THEN PROGRESS/EXPAND SOUTHWARD INTO EARLY EVENING. GIVEN PWATS NEAR 2 INCHES AGAIN TODAY ALONG WITH RELATIVELY WEAK STORM MOTIONS...ADDED MENTION OF LOCALLY HEAVY RAINFALL TO THE FORECAST. THE RISK FOR ANY SEVERE WEATHER IS LOW WITH LITTLE BULK SHEAR...BUT GIVEN LI VALUES AS LOW AS -7 INLAND...SBCAPES 2500-3000 J/KG AND POSSIBLY SOME MID-LEVEL DRY AIR MOVING IN LATE WE CANNOT RULE OUT ISOLATED SEVERE STORMS WITH DAMAGING DOWNBURST WINDS. HIGHS LOOK TO TOP OUT IN THE MID/UPPER 80S NORTH AND ALONG THE COAST WITH LOWER 90S ACROSS INTERIOR SECTIONS. && .SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY/... DIURNAL SEABREEZE CONVECTION SHOULD BEGIN TO FADE THIS EVENING. ONE WILD-CARD IS THE POSSIBILITY OF A SHORTWAVE TROUGH DROPPING THROUGH THE AREA LATE IN THE EVENING OR OVERNIGHT. CHANCES FOR CONSIDERABLE PRECIPITATION OVERNIGHT SEEMS LOW SINCE SIGNIFICANTLY DRIER AIR WILL BEGIN FILTERING IN BEHIND THE FRONT. WE HAVE POPS TAPERING OFF FROM NORTH TO SOUTH OVERNIGHT WITH LOWS DROPPING INTO THE UPPER 60S IN THE NORTH AND LOWER 70S OVER SOUTHEAST GA. THURSDAY...THE MEAN MID/UPPER TROUGH FINALLY PUSHES SE AND OUT OF THE LOCAL AREA...WITH THE ASSOCIATED SURFACE TROUGH TO SHIFT SOUTH OF SE GA AS THE DAY PROGRESSES. WE FEEL CONFIDENT THAT COVERAGE OF SHOWERS AND T-STORMS WILL BE LESS THAN RECENT DAYS...BUT HOW MUCH LESS WILL BE DETERMINED BY HOW MUCH DRIER AIR IS ABLE TO WORK ITS WAY IN AS SURFACE HIGH PRESSURE BUILDS FROM THE NORTH. WITH A WEAK SHORT WAVE TO PUSH THROUGH WITHIN THE NW AND NORTH FLOW ALOFT...AIDED BY THE ENTRANCE REGION OF THE UPPER LEVEL JET AS IT MOVES OFF THE NC COAST...OUR FORECAST WILL MAINTAIN 20-30 POPS FROM BEAUFORT TO EFFINGHAM AND CANDLER COUNTIES SOUTH TO THE ALTAMAHA RIVER WHERE THE BEST LIFT AND DEEPEST MOISTURE WILL BE FOUND. IF THE SEA BREEZE BOUNDARY IS ABLE TO COME INTO PLAY WE MIGHT SEE ISOLATED CONVECTION EVEN FURTHER NORTH. THE PURE LOW LEVEL THICKNESS FORECAST WAS UNDERCUT BY A COUPLE OF DEGREES WITH AN ONSHORE FLOW TO SET IN. THIS SUPPORTS MID-UPPER 80S JUST ABOUT EVERYWHERE AWAY FROM THE COAST...WITH A FEW SPOTS NEAR 90 OVER THE FAR SW CORNER. FRIDAY...THE FORECAST AREA WILL LIE BETWEEN THE MEAN DEEP LAYERED TROUGH OVER THE ATLANTIC AND FLORIDA...WITH DEEP RIDGING FROM SE CANADA TO TEXAS. IN RESPONSE HIGH PRESSURE FROM EASTERN CANADA WILL BUILD SOUTHWARD WITH ITS ASSOCIATED WEDGE TO PREVAIL INLAND ACROSS THE SE. EVEN DRIER AIR WORKS ITS WAY SOUTHWARD...WITH PWATS FORECAST DOWN NEAR 2 STANDARD DEVIATIONS BELOW NORMAL...ONLY AROUND AN INCH OF SO. WHEN COMBINED WITH CONSIDERABLE DRY AIR ABOVE 7-8K FEET...A DECENT SUBSIDENCE INVERSION AND THE LACK OF ANY SHORT WAVES...WE HAVE OPTED FOR A RAIN-FREE FORECAST. WE CANNOT ENTIRELY RULE OUT A FEW SHOWERS ALONG OUR COASTAL ZONES WHERE THE BEST LOW LEVEL CONVERGENCE WILL BE FOUND...BUT FOR NOW WE/LL KEEP ANY SHOWERS OVER THE ATLANTIC. RH LEVELS WILL BE NOTICEABLY DRIER...WITH DEW POINTS IN MOST LOCATIONS TO FALL TO THE LOWER 60S...WITH EVEN SOME UPPER 50S NOT OUT OF THE QUESTION. 850 MB TEMPS ARE NO MORE THAN 12-13C...WHICH WILL HOLD DAYTIME HIGHS FROM 83 NE TO 87 SW...WHILE SHORELINE AREAS WILL BE DOWN CLOSER TO 80 WITH A BREEZY ONSHORE WINDS. SATURDAY...THE MEAN TROUGH IN THE ATLANTIC WILL TRY AND INCH ITS WAY BACK WEST. BUT THE SURFACE WEDGE REMAINS FIRMLY IN PLACE...AND THAT ALONG WITH THE ABSENCE OF DEEP MOISTURE AND SHORT WAVE FEATURES SUPPORTS LITTLE CHANCE OF RAINFALL. HOWEVER...THERE IS ENOUGH LOW LEVEL MOISTURE TO COMBINE WITH LOW LEVEL CONVERGENCE WITHIN AN EAST AND NE SYNOPTIC FLOW TO GENERATE A FEW SHOWERS OVER COASTAL SE GA. MAX TEMPS WILL BE SIMILAR TO WHAT THEY ARE FORECAST FOR FRIDAY. && .LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/... THE TROUGH OVER THE ATLANTIC CLOSES OFF BY EARLY NEXT WEEK AND RETROGRADES WEST TOWARD THE MID ATLANTIC COAST THROUGH TUESDAY...BEFORE ITS OPENS UP AND BEGINS TO LIFT OUT TO THE NE WEDNESDAY. AT THE SAME TIME THE SURFACE HIGH PRESSURE WEDGE INLAND THROUGH SUNDAY BEGINS TO WEAKEN MONDAY...AS THE PARENT HIGH MOVES INTO THE ATLANTIC OFF THE NEW ENGLAND STATES. THE SYNOPTIC FLOW WILL GRADUALLY TURN MORE EASTERLY...AND WILL ALLOW FOR AT LEAST SOME RETURN OF MOISTURE. HOWEVER...WITH AN OFFSHORE TRAJECTORY ALOFT ANY MOISTURE WILL BE CONFINED TO THE LOW LEVELS. FOR THAT REASON WE/LL NOT CARRY ANYTHING MORE THAN 20-30 POPS. TEMPS WILL CONTINUE BELOW TYPICAL LEVELS THROUGH THE EXTENDED PERIODS. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... EXPECT SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE AREA THIS AFTERNOON AND WILL CONTINUE THE TEMPO GROUPS INDICATING SUCH AT BOTH TERMS. MOST RAINFALL SHOULD BE OVER EARLY THIS EVENING WITH VFR CONDS TO PREVAIL THE REST OF THE PERIOD AS DRIER AIR FILTERS INTO THE AREA AS DEEP TROUGHING FINALLY SHIFTS SOUTHEAST OF THE AREA. LOW CHANCE FOR MVFR OR LOWER CONDITIONS LATE TONIGHT IN LOW CIGS/FOG DUE TO LINGERING LOW-LEVEL MOISTURE...ESPECIALLY IF THE TERMS RECEIVE MUCH RAINFALL TODAY. NE WINDS WILL BE ON THE INCREASE AFTER DAYBREAK THU AS HIGH PRESSURE BEGINS TO BUILD FROM THE NORTH. EXTENDED AVIATION OUTLOOK...MOSTLY VFR WEATHER THROUGH SUNDAY. BREEZY CONDITIONS BOTH FRIDAY AND SATURDAY AFTERNOON. && .MARINE... OUTSIDE OF CONVECTION WHICH WILL PRODUCE HEAVY RAINS...REDUCED VISIBILITY...GUSTY WINDS AND LIGHTNING STRIKES...MARINE CONDITIONS ARE GENERALLY QUIET TODAY AS THE SURFACE TROUGH SHIFTS OFFSHORE AND THE WINDS GO LIGHT AND VARIABLE...EXCEPT ONSHORE NEAR THE COAST WITH SEA BREEZE CIRCULATION. HIGH PRESSURE WILL BEGIN BUILDING IN TONIGHT BEHIND A WEAK COLD FRONT WITH WINDS TURNING TO THE NORTHEAST AND INCREASING. WE/RE ACTUALLY LOOKING AT THE POSSIBILITY OF SMALL CRAFT ADVISORY CONDITIONS ACROSS AT LEAST PARTS OF THE MARINE AREA LATE THIS WEEK INTO EARLY NEXT WEEK. HIGH PRESSURE WILL PROGRESSIVELY BUILD FROM THE NORTH IN WAKE OF A DEPARTING TROUGH STARTING THURSDAY. AS THE INLAND AREA OF HIGH PRESSURE SETTLES INTO PLACE...THE PRESSURE GRADIENT WILL START TIGHTENING BEHIND IT AND WEAK ATLANTIC LOW PRESSURE FAR TO THE SE OF OUR WATERS. THERE LOOKS TO BE ENOUGH PINCHING FOR NE WINDS AND THE ASSOCIATED BUILDING SEAS TO FLIRT WITH THE ADVISORY CRITERIA THURSDAY NIGHT OR FRIDAY INTO EARLY NEXT WEEK. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...NONE. SC...NONE. MARINE...NONE. && SYNOPSIS... NEAR TERM...RJB SHORT TERM... LONG TERM... AVIATION...RJB MARINE...
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHARLESTON SC 351 AM EDT WED JUN 13 2012 AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040- 042>045-047>052-141130- CHARLESTON HARBOR- WATERS FROM SOUTH SANTEE RIVER TO EDISTO BEACH SC OUT 20 NM- WATERS FROM EDISTO BEACH SC TO SAVANNAH GA OUT 20 NM- WATERS FROM SAVANNAH GA TO ALTAMAHA SOUND GA OUT 20 NM...INCLUDING GRAYS REEF NATIONAL MARINE SANCTUARY- WATERS FROM SAVANNAH GA TO ALTAMAHA SOUND GA EXTENDING FROM 20 TO 60 NM-JENKINS-SCREVEN-CANDLER-BULLOCH-EFFINGHAM-TATTNALL-EVANS- INLAND BRYAN-COASTAL BRYAN-INLAND CHATHAM-COASTAL CHATHAM-LONG- INLAND LIBERTY-COASTAL LIBERTY-INLAND MCINTOSH-COASTAL MCINTOSH- ALLENDALE-HAMPTON-INLAND COLLETON-DORCHESTER-INLAND BERKELEY- INLAND JASPER-BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER- TIDAL BERKELEY- 351 AM EDT WED JUN 13 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS...SOUTHEAST GEORGIA AND SOUTHEAST SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 306 PM EDT WED JUN 13 2012 SCZ044-045-050-052-131930- CHARLESTON-DORCHESTER-INLAND BERKELEY-TIDAL BERKELEY- 306 PM EDT WED JUN 13 2012 ...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF DORCHESTER... CHARLESTON AND BERKELEY COUNTIES THROUGH 330 PM EDT... AT 303 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM...NEAR CYPRESS GARDENS...MOVING SOUTHWEST AT 10 MPH. SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE... CHARLESTON NAVAL COMPLEX...COLLEGE PARK...CROWFIELD PLANTATION...DON HOLT BRIDGE...GOOSE CREEK...HANAHAN...LADSON...NAVAL WEAPONS STATION CHARLESTON AND SANGAREE... PREPARE NOW FOR THE FOLLOWING HAZARDS... GUSTY WINDS OF 40 TO 50 MPH... PRECAUTIONARY/PREPAREDNESS ACTIONS... HAVE AN ACTION PLAN READY IN THE EVENT THIS STORM STRENGTHENS OR A WARNING IS ISSUED. CONTINUE TO MONITOR NOAA WEATHER RADIO ALL HAZARDS FOR THE LATEST WEATHER INFORMATION. && LAT...LON 3283 7993 3298 8019 3313 8001 3307 7983 TIME...MOT...LOC 1906Z 025DEG 9KT 3305 7996
The Charleston,SC radar (KCLX), 108 km away, was scanning. The volume nearest the first event began at 19:32 UTC.
5 thunderstorm wind, 1 hail. Local standard time, as filed.
A spotter reported several small trees down along Crown Pointe Street.
The public reported quarter size hail near mile marker 209 on Interstate 26.
A 911 call center reported one tree down near the intersection of Ashley River Road and Pierpont Avenue.
The public reported 10 large trees down and fence damage near Woodland Road and Wayne Scott Court.
One tree was down near the intersection of Belvedere Road and Main Road.
The public reported one tree down in Saint Stephen.
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, June 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: 393409, 393406, 393407, 393411, 393408, 393410.