Numerous outflow boundaries in combination with the sea breeze and the retreat of strong upper level ridging allowed numerous showers and thunderstorms to develop in a highly unstable environment.
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 CHS wrote it up.
Numerous outflow boundaries in combination with the sea breeze and the retreat of strong upper level ridging allowed numerous showers and thunderstorms to develop in a highly unstable environment.
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 Aug 11, 8:27 PM EST, 13 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHARLESTON SC 927 PM EDT SAT AUG 11 2007 .SYNOPSIS... AN UPPER LEVEL RIDGE OF HIGH PRESSURE WILL REMAIN WEST OF THE AREA THROUGH NEXT WEEK. A COLD FRONT WILL MOVE THROUGH THE AREA TONIGHT WITH WEAK HIGH PRESSURE RETURNING FOR NEXT WEEK. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... CONVECTIVE COMPLEX RESPONSIBLE FOR PRODUCING WIND DAMAGE ACROSS A GOOD PORTION OF SOUTHEAST GEORGIA EARLIER THIS AFTERNOON AND EVENING HAS SHIFTED SOUTH OF THE AREA. WHILE THE ATMOSPHERE HAS STABILIZED IN THE WAKE OF THESE STORMS...SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE PEE DEE ARE DROPPING SOUTH INTO THE AREA AHEAD OF A COLD FRONT. THE ATMOSPHERE REMAINS QUITE UNSTABLE ACROSS SOUTHEAST SOUTH CAROLINA...SO EXPECT A POTENTIAL FOR A FEW STRONG STORMS TO DEVELOP...WITH GUSTY WINDS...FREQUENT LIGHTNING AND HEAVY RAINFALL THE MAIN THREATS. THE SCATTERED SHOWERS AND THUNDERSTORMS WILL SHIFT FROM SOUTHEAST SOUTH CAROLINA BACK INTO SOUTHEAST GEORGIA LATE TONIGHT AS THE COLD FRONT CONTINUES TO PROCEED THROUGH THE FORECAST AREA. ALL EXCESSIVE HEAT WARNINGS/HEAT ADVISORIES HAVE BEEN CANCELLED AS HEAT INDEX VALUES CONTINUE TO FALL AND ARE BELOW CRITERIA AT ALL LOCATIONS. HAVE ADJUSTED FORECAST HOURLY TEMPERATURES TO REFLECT THE RAIN-COOLED AIRMASS WHICH IS IN PLACE ACROSS SOUTHEAST GEORGIA THIS EVENING. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/... THE COLD FRONT WILL DISSIPATE SOUTH OF THE AREA ON SUNDAY. THERE WILL BE ENOUGH OF AN AIRMASS CHANGE TO ALLOW HIGHS TO ONLY GET INTO THE LOWER TO MID 90S. THESE TEMPERATURES COMBINED WITH DEWPOINTS IN THE LOWER TO MID 70S WILL RESULT IN HEAT INDEX VALUES OF 100-105 IN THE TRI-COUNTY AREA...AND AROUND 105 ELSEWHERE. SINCE THESE VALUES ARE ONLY MARGINAL...WILL NOT ISSUE A HEAT ADVISORY AT THIS TIME FOR SUNDAY...ALTHOUGH ONE MAY BE ISSUED FOR A PORTION OF THE AREA WITH LATER FORECASTS. ISOLATED CONVECTION IS POSSIBLE SUNDAY AFTERNOON INTO SUNDAY EVENING...ALTHOUGH SCATTERED COVERAGE IS POSSIBLE IN FAR SOUTHERN PORTIONS OF THE FORECAST AREA CLOSER TO THE DISSIPATING FRONTAL BOUNDARY. && .LONG TERM /MONDAY THROUGH SATURDAY/... THE FCST AREA WILL REMAIN ON THE ERN PERIPHERY OF THE MID AND UPPER RIDGE THAT HAS RETROGRADED TO THE W EARLY IN THE WEEK...AND THE LONG WAVE TROUGH OVER THE WRN ATLC. AT THE SURFACE...THE REMNANTS OF THE COOL FRONT WILL DISSIPATE NEAR OR S OF THE AREA MON...WITH A WEAK SURFACE TROUGH TO MOVE THROUGH MON NIGHT...WITH A WEAK PRES PATTERN TO DEVELOP TUE. FOR THE MID AND LATTER HALF OF THE WEEK...THE RIDGE WILL BEGIN TO BUILD E AGAIN WITH SLOWLY RISING HEIGHTS...WHILE THE ATLC RIDGE AT THE SURFACE AND LOW LEVELS WILL GRADUALLY MAKE ITS RETURN ACROSS THE REGION. FOCUS FOR CONVECTION DURING MUCH OF THE WEEK LOOKS TO BE THE SEA BREEZE...SO AT THIS TIME WE ARE NOT FORECASTING ANYTHING MORE THAN SLIGHT CHANCE TO CHANCE POPS. HOWEVER...A WEAK SHORT WAVE AND SURFACE TROUGH LOOKS TO MOVE THROUGH FROM THE NW MON NIGHT...AND COULD ENHANCE PRECIP CHANCES SHOULD IT MOVE IN BEFORE SUNSET MON EVE. THIS WILL NEED TO BE WATCHED IN LATER FCSTS. TEMPS DO NOT LOOK TO BE AS HIGH AS THE RECENT HOT WX...BUT STILL ABOVE NORMAL LEVELS THROUGHOUT THE WEEK. LOOK FOR MAX TEMPS TO CLIMB INTO THE MID AND UPPER 90S EACH AFTN...BUT THE SEA BREEZE WILL HOLD COASTAL TEMPS DOWN CLOSER TO 90. NIGHT TIME MINS WILL GENERALLY BE IN THE LOWER TO MIDDLE 70S...EXCEPT HIGHER ALONG THE SHORELINE. WILL NEED TO KEEP AN EYE ON THE TROPICS NEXT WEEKEND...TO SEE WHAT BECOMES OF THE STRONG WAVE THAT HAS RECENTLY MOVED OFF THE AFRICAN COAST. && .AVIATION /01Z SUNDAY THROUGH THURSDAY/... CONSIDERABLE MID AND LEVEL DEBRIS CLOUDS ACROSS BOTH TERMINALS THIS EVE WILL GRADUALLY THIN AND DISSIPATE TONIGHT. PRECIP LOOKS TO HAVE ENDED AT KSAV...BUT CLUSTERS OF SHRA/TSRA DEVELOPING N OF KCHS THIS EVE ALONG THE COOL FRONT. THUS WE COULD SEE THIS ACTIVITY IMPACTING THE KCHS TERMINAL BETWEEN 01Z AND 05Z. CURRENT 00Z TAF HAS CUMULONIMBUS CLOUDS AND VCTS DURING THIS TIME...BUT POTENTIAL DOES EXIST FOR GUSTY WINDS AND MVFR CONDITIONS SHOULD A TSRA IMPACT THE IMMEDIATE AREA. LATER TONIGHT WILL NEED TO KEEP WATCH FOR POSSIBLE MVFR CONDITIONS AT BOTH SITES SHOULD CLOUDS DISSIPATE ENOUGH TO ALLOW FOR LOW STRATUS AND/OR LIGHT FOG TO FORM. CURRENT INDICATIONS ARE FOR VFR WEATHER AT BOTH TERMINALS ON SUN...BUT WITH FRONTAL BOUNDARY IN THE AREA AND INTERACTION WITH THE SEA BREEZE THERE IS A SMALL CHANCE OF TSRA AT EITHER SITE IN THE AFTN. PROBABILITY IS TOO LOW AT THIS TIME TO INCLUDE IN THE 00Z TAFS. LIGHT WINDS EARLY IN THE FCST PERIOD WILL BECOME NE OVERNIGHT OR SUN MORNING...BEFORE VEERING TO E WITH THE SEA BREEZE IN THE AFTN. EXTENDED AVIATION OUTLOOK... MAINLY VFR CONDS ARE EXPECTED SUN THROUGH THU...WITH A CHANCE OF SEEING VSBYS DROP TO MVFR OR IFR LEVELS DURING THE EARLY MRNG HRS AND DURING AFTN/EVE CONVECTION. && .MARINE... FROPA STLIL LOOKS TO OCCUR LATE TNGT THRU TMRW MRNG FROM N TO S ACRS THE WATERS. WILL LOOKS FOR A MINOR TIGHTENING OF THE PRES GRAD AHEAD OF THE FNT...WHICH MAY AT TIMES PUSH WIND SPEEDS INTO THE 15-20 KT RANGE...BUT WITH ALL AREA BUOYS AND SHORELINE SITES AOB 12 KT AM NOT QUITE READY TO PUT UP ANY SCEC HEALINES. WITH THE FROPA...WINDS MAY SURGE FROM THE NE BUT WLIL NEED TO SEE WHAT HAPPENS UPSTREAM BEFORE MAKING ANY UPWARD ADJUSTMENTS IN CURRENTLY ADVERTISED WIND SPEEDS. WILL ALSO NEED TO KEEP AN EYE ON WAVE HEIGHTS AS ANY NELY SURGE COULD BE RESPONSIBLE FOR PUSHING SEAS NEAR THE 6 FOOT MARK. FOR NOW...WILL KEEP WITH A BLEND OF PERSISTENCE AND LATEST WW3 GUIDANCE WHICH CAPS WAVES AT 5 FT IN THE OUTER GA WATERS AND 4 FT FOR ALL WATERS WITHIN 20 NM OF SHORE. NO MAJOR CONCERNS AT PRESENT FOR THE MARINE COMMUNITY THROUGH THE WEEK...ALTHOUGH DEPENDING UPON THE STRENGTH AND TIMING OF THE SURFACE TROUGH ASSOCIATED WITH THE SHORT WAVE EXPECTED MON NIGHT...WE MAY NEED TO ADJUST SOME WIND FCSTS AT A LATER TIME. THEREAFTER THE ATLC RIDGE WILL GRADUALLY MAKE IT RETURNS AND LOOKING AT A MOSTLY SLY FLOW FOR TUE THROUGH THE END OF THE WEEK. ALTHOUGH WE DO NEED TO WATCH FOR SOME ENHANCEMENT OF WINDS WITH THE AFTN SEA BREEZE AND NOCTURNAL SURGES...FOR THE MOST PART WINDS WILL REMAIN 15 KT OR LESS...WITH SEAS NO HIGHER THAN 3 OR 4 FT. && .CLIMATE... RECORD HIGH MINIMUMS FOR SUNDAY... CHARLESTON AIRPORT 81/1941 DOWNTOWN CHARLESTON 83/1999 SAVANNAH AIRPORT 78/1999 && .CHS WATCHES/WARNINGS/ADVISORIES... GA...NONE. SC...NONE. MARINE...NONE. && MARINE...JPC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHARLESTON SC 709 PM EDT SAT AUG 11 2007 GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>051-122315- 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-BERKELEY-INLAND JASPER- BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER- 709 PM EDT SAT AUG 11 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST GEORGIA AND SOUTHEAST SOUTH CAROLINA. .DAY ONE...TONIGHT. STRONG THUNDERSTORMS..A FEW THUNDERSTORMS EARLY TONIGHT COULD BECOME STRONG...PRODUCING GUSTY WINDS...CLOUD TO GROUND LIGHTING AND VERY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. EXCESSIVE HEAT...HEAT INDICES MAY REACH AROUND 105 DEGREES ACROSS PARTS OF SOUTHEAST GEORGIA AND SOUTHEAST SOUTH CAROLINA THROUGH FRIDAY. HEAT ADVISORIES AND/OR EXCESSIVE HEAT WARNINGS MAY EVENTUALLY BE NEEDED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS CURRENTLY NOT ANTICIPATED. AMZ330-350-352-354-374-122315- 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- 709 PM EDT SAT AUG 11 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS. .DAY ONE...TONIGHT. STRONG THUNDERSTORMS...A FEW THUNDERSTORMS COULD BECOME STRONG ACROSS THE COASTAL WATERS TONIGHT...PRODUCING GUSTY WINDS...CLOUD TO WATER LIGHTNING AND VERY HEAVY RAINS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WE DO REQUEST ANY REPORTS OF CONDITIONS OVER THE MARINE AREA TONIGHT. 33/JAQ
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
617 PM EDT SAT AUG 11 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0520 PM TSTM WND DMG REIDSVILLE 32.09N 82.12W
08/11/2007 TATTNALL GA COUNTY OFFICIAL
COUNTY WARNING POINT REPORTS SEVERAL TREES DOWN IN
REIDSVILLE. TIME ESTIMATED BASED ON RADAR.
&&
33SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 630 PM EDT SAT AUG 11 2007 GAZ138-112330- INLAND LIBERTY- 630 PM EDT SAT AUG 11 2007 ...STRONG THUNDERSTORMS WILL IMPACT LIBERTY COUNTY THROUGH 730 PM EDT... AT 629 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING 1/2 INCH HAIL...AND STRONG WINDS OF 45 TO 55 MPH. THIS STORM WAS LOCATED NEAR SCREVEN FORK...OR ABOUT 9 MILES SOUTHEAST OF HINESVILLE...MOVING SOUTH AT 5 MPH. AREAS IN AND AROUND ALLENHURST...CROSSROADS...FLEMINGTON...FORT STEWART...GUM BRANCH...HINESVILLE...MCINTOSH...RETREAT... RICEBORO...SUNBURY...MIDWAY AND HALFMOON LANDING WILL BE IMPACTED THROUGH 730 PM EDT. EXCESSIVE CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED. POSTPONE OUTDOOR ACTIVITIES PROMPTLY. GO QUICKLY INSIDE A COMPLETELY ENCLOSED BUILDING. THIS THUNDERSTORM IS ALSO PRODUCING VERY HEAVY RAIN...WHICH MAY FLOOD ROADS...DITCHES AND LOW-LYING AREAS. AVOID FLOOD PRONE AREAS AND DO NOT DRIVE INTO PLACES WHERE WATER COVERS THE ROAD. PLEASE CONTACT THE NATIONAL WEATHER SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 IF YOU OBSERVE SEVERE WEATHER.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
730 PM EDT SAT AUG 11 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0625 PM TSTM WND DMG 2 NW WEFANIE 31.79N 81.84W
08/11/2007 LONG GA LAW ENFORCEMENT
1 TREE FELL DOWN ON A POWERLINE NEAR THE INTERSECTION OF
RYEPATCH ROAD AND HIGHWAY 301.
&&
DPBSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 806 PM EDT SAT AUG 11 2007 SCZ045-050-120100- BERKELEY-CHARLESTON- 806 PM EDT SAT AUG 11 2007 ...STRONG THUNDERSTORMS WILL IMPACT BERKELEY COUNTY AND CHARLESTON COUNTY THROUGH 9 PM EDT... AT 803 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING 1/2 INCH HAIL...AND GUSTY WINDS OF 30 TO 40 MPH. THIS STORM WAS LOCATED NEAR NEWLAND...OR ABOUT 9 MILES NORTHWEST OF MCCLELLANVILLE...MOVING SOUTH AT 15 MPH. AREAS IN AND AROUND SHULERVILLE...SIMMONSVILLE AND WAMBAW CORNER WILL BE IMPACTED THROUGH 9 PM EDT. FREQUENT LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS. IF INDOORS...STAY AWAY FROM WINDOWS AND DOORS. AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. PLEASE CONTACT THE NATIONAL WEATHER SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 IF YOU OBSERVE SEVERE WEATHER.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 914 PM EDT SAT AUG 11 2007 SCZ045-050-120215- BERKELEY-CHARLESTON- 914 PM EDT SAT AUG 11 2007 ...STRONG THUNDERSTORMS WILL IMPACT BERKELEY COUNTY AND CHARLESTON COUNTY THROUGH 1015 PM EDT... AT 912 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING 1/2 INCH HAIL...AND GUSTY WINDS OF 35 TO 45 MPH. THIS STORM WAS LOCATED NEAR CHARITY...OR ABOUT 11 MILES EAST OF GOOSE CREEK...MOVING SOUTH AT 20 MPH. AREAS IN AND AROUND AWENDAW...CAINHOY...CHARLESTON AIRPORT...DANIEL ISLAND...GOOSE CREEK...HANAHAN...HUGER...MOUNT PLEASANT...NORTH CHARLESTON...SULLIVANS ISLAND AND WANDO WILL BE IMPACTED THROUGH 1015 PM EDT. EXCESSIVE CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED. POSTPONE OUTDOOR ACTIVITIES PROMPTLY. GO QUICKLY INSIDE A COMPLETELY ENCLOSED BUILDING. BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH. SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS. PLEASE CONTACT THE NATIONAL WEATHER SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 IF YOU OBSERVE SEVERE WEATHER.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 926 PM EDT SAT AUG 11 2007 SCZ050-120230- CHARLESTON- 926 PM EDT SAT AUG 11 2007 ...STRONG THUNDERSTORMS WILL IMPACT CHARLESTON COUNTY THROUGH 1030 PM EDT... AT 921 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING 1/2 INCH HAIL...AND GUSTY WINDS OF 35 TO 45 MPH. THIS STORM WAS LOCATED 6 MILES NORTHWEST OF PHILIP...OR ABOUT 9 MILES EAST OF GOOSE CREEK...MOVING SOUTH AT 25 MPH. AREAS IN AND AROUND CHARLESTON...CHARLESTON AIRPORT...HANAHAN...JAMES ISLAND...MOUNT PLEASANT...NORTH CHARLESTON...SHADOWMOSS...SULLIVANS ISLAND AND WEST ASHLEY WILL LIKELY BE IMPACTED THROUGH 1030 PM EDT. FREQUENT LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS. IF INDOORS...STAY AWAY FROM WINDOWS AND DOORS. AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH. SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS. PLEASE CONTACT THE NATIONAL WEATHER SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 IF YOU OBSERVE SEVERE WEATHER.
The Charleston,SC radar (KCLX), 100 km away, was scanning. The volume nearest the first event began at 01:41 UTC.
1 thunderstorm wind. Local standard time, as filed.
Several trees were reported down just east of College Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2007Every state in 2007This day in weather historyWarnings in South Carolina, August 2007
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: 52271.