A few thunderstorms developed along the sea breeze as it pushed inland into an environment with moderate instability.
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.
A few thunderstorms developed along the sea breeze as it pushed inland into an environment with moderate instability.
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 Jul 21, 12:27 PM EST, 53 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHARLESTON SC 127 PM EDT SAT JUL 21 2007 .SYNOPSIS... A FRONTAL BOUNDARY WILL PUSH THROUGH THE AREA TODAY AND THEN LINGER OVER NORTHERN FLORIDA THROUGH SUNDAY. HIGH PRESSURE WILL BUILD OVER THE REGION IN THE WAKE OF THE FRONT AND PERSIST INTO EARLY NEXT WEEK. THE FRONTAL BOUNDARY OVER FLORIDA WILL THEN LIFT BACK NORTH AS A WARM FRONT BY MID WEEK. A WAVE OF LOW PRESSURE ALONG THE FRONT WILL KEEP HIGHER THAN NORMAL RAIN CHANCES OVER THE AREA THROUGH THE END OF THE WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... CDFNT IS STILL MEANDERING THROUGH SE GA THIS AFTN WITH A SHARPENING DEWPTS GRADIENT NOW OBVIOUS IN SFC OBSERVATIONS. INSTABILITY PLOTS SHOW SBCAPES AOA 2500 J/KG AN LI/S AS LOW AS -6C S OF I-16 WITH INCRG DEEP LYRD CONVERGENCE. ISOLD SHOWERS ARE BEGINNING TO FORM ACROSS SCREVEN COUNTY GA SO XPCT COVERAGE TO SLOWLY INCR THROUGH THE REMAINDER OF THE AFTN. A FEW STRONG TSTMS CAN NOT BE RULED OUT. 20/30 POPS...HIGHEST ACROSS SE GA...IS STILL ON TRACK. && .SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY NIGHT/... NOT MUCH CHANGE IN THE OVERALL PATTERN THROUGH TONIGHT. ALTHOUGH...WITH LOSS OF DAYTIME HEATING AND THE SEA BREEZE... WILL KEEP A DRY FORECAST OUTSIDE OF ANY LINGERING EVENING SHOWERS AND THUNDERSTORMS. LOWS WILL DIP INTO THE UPPER 60S INLAND WITH LOWER 70S NEAR THE COAST...ALTHOUGH CANNOT RULE OUT MID 60S IN SOME INLAND LOCALES. THE FRONTAL BOUNDARY WILL BE WELL SOUTH OF THE AREA ON SUNDAY. SURFACE DEWPOINTS STILL LOOK MARGINAL FOR WIDESPREAD CONVECTIVE DEVELOPMENT ALONG THE SEA BREEZE. HOWEVER WILL CONTINUE TO MENTION A SLIGHT CHANCE OF SHOWERS/THUNDERSTORMS...ESPECIALLY ACROSS SE GA WHERE LOW-LEVEL MOISTURE WILL BE A BIT HIGHER. HIGH TEMPERATURES SUNDAY WILL REACH THE LOWER 90S AWAY FROM THE COAST. AFTER LINGERING EVENING SHOWERS/THUNDERSTORMS...SUNDAY NIGHT WILL BE DRY WITH LOWS IN THE MID/UPPER 60S INLAND AND LOWER 70S NEAR THE COAST. INTERESTINGLY...THE RECORD LOWS FOR CHARLESTON /60 DEGREES SET IN 1966/ AND SAVANNAH /61 DEGREES SET IN 1966/ APPEAR TO BE SAFE...ALTHOUGH WE MAY GET WITHIN A FEW DEGREES OF THE RECORD LOW OF 69 DEGREES SET IN 1966 IN DOWNTOWN CHARLESTON. && .LONG TERM /MONDAY THROUGH FRIDAY/... A CLOSED UPPER LEVEL LOW PRESSURE SYSTEM WILL BE POSITIONED OVER THE OHIO VALLEY ON MONDAY...WHILE AT THE SURFACE A NORTHEAST FLOW ACROSS THE AREA WILL SLOWLY VEER ONSHORE AS HIGH PRESSURE BEGINS TO SHIFT OFFSHORE WELL NORTH OF THE AREA. ISOLATED CONVECTION IS EXPECTED ACROSS MOST AREAS MONDAY...ALTHOUGH THE COVERAGE SHOULD BE SCATTERED ACROSS PARTS OF SOUTHEAST GEORGIA WHERE GREATER MOISTURE POOLING AND SURFACE CONVERGENCE IS EXPECTED DUE TO THE PROXIMITY OF A STALLED FRONTAL BOUNDARY SOUTH OF THE AREA. A WARM FRONT WILL BEGIN TO LIFT ACROSS THE AREA ON TUESDAY IN RESPONSE TO THE HIGH PRESSURE SYSTEM THAT WILL CONTINUE TO MOVE FARTHER OFFSHORE NORTH OF THE AREA. ALONG THE EASTERN PERIPHERY OF THE UPPER LEVEL TROUGH A STRONG 250 MB JET WILL DEVELOP FOR THIS TIME OF YEAR...AND THE FORECAST AREA WILL BE LOCATED IN THE FAVORABLE FRONT ENTRANCE REGION. GIVEN THESE FACTORS ALONG WITH A DEEP ONSHORE FLOW...TUESDAY AFTERNOON/EVENING APPEAR FAVORABLE FOR AT LEAST SCATTERED SHOWER AND THUNDERSTORM ACTIVITY. THERE IS ALSO THE POTENTIAL FOR STRONG OR EVEN SEVERE THUNDERSTORMS TO DEVELOP AS DEWPOINTS RECOVER INTO THE LOWER 70S...CAPE VALUES APPROACH 1500 J/KG AND WIND SHEAR STRENGTHENS DUE TO THE PROXIMITY OF THE LIFTING FRONTAL BOUNDARY AND JETTING ALOFT. WEDNESDAY ALSO APPEARS FAVORABLE FOR SCATTERED SHOWERS AND THUNDERSTORMS AS THE FRONTAL BOUNDARY STALLS NEAR OF JUST WEST OF THE FORECAST AREA. MEANWHILE...WEAK CHANNELED VORTICITY ALOFT WILL BE IN PLACE ALONG THE EASTERN PERIPHERY OF THE UPPER LEVEL TROUGH AIDING IN LIFT ACROSS THE AREA. AS IF THE SYNOPTIC PATTERN MONDAY THROUGH WEDNESDAY WAS NOT UNUSUAL ENOUGH FOR THIS TIME OF YEAR...THE UPPER LEVEL LOW IS FORECAST TO MOVE SOUTH ACROSS THE SOUTHERN APPALACHIANS AND OVER THE DEEP SOUTH THURSDAY AND FRIDAY. A WAVE OF LOW PRESSURE COULD DEVELOP ALONG THE EASTERN PERIPHERY OF THE TROUGH AND TRACK NORTHEAST ALONG THE STALLED FRONTAL BOUNDARY DURING THIS TIME. AS A RESULT...SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH AFTERNOON AND EVENING...AIDED BY THE SEA BREEZE BOUNDARY. TEMPERATURES SHOULD BE SLIGHTLY BELOW NORMAL TROUGH THE LONG TERM PERIOD. && .AVIATION /18Z SATURDAY THROUGH THURSDAY/... VFR CONDITIONS WL PREVAIL FOR THE NXT 24 HRS. COULD SEE AN ISOLD TSTM NEAR THE SAV TERMINAL THROUGH 22Z AS A CDFNT MOVES THROUGH. WL CONTINUE MENTION OF CB/S TO COVER FOR NOW. DRY WX WL PREVAIL AT CHS. EXTENDED AVIATION OUTLOOK...VFR CONDITIONS GENERALLY EXPECTED. HOWEVER...MVFR OR IFR CEILINGS ARE POSSIBLE IN ISOLATED OR SCATTERED AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS THROUGH WEDNESDAY. && .MARINE... THE GRADIENT CONTINUES TO PINCH ALONG THE CHARLESTON COUNTY COAST EARLY THIS AFTN. REPORTS FROM FBIS1...CAP2 AND THE SHIP SAINT LOUIS EXPRESS /CALL ID WDD3825/ SUGGEST WNDS ARE APRCHG 20 KT. RECENTLY UPDATED THE CWF TO RAISE A HEADLINE FOR SCEC FOR THE WTRS FROM SOUTH SANTEE TO EDISTO BEACH. OTRW WNDS WL CONTINUE TO BACK ACROSS THE GA WTRS AS A CDFNT MOVES FARTHER TO THE S. SEAS WILL BUILD TODAY...POSSIBLY REACHING SCSEC CRITERIA OVER THE OUTER GA WATERS AS EARLY AS EARLY SUN. AN EASTERLY SWELL WILL BE NOTICEABLE DUE TO THE PERSISTENT ONSHORE FLOW. ONSHORE WINDS ARE EXPECTED MONDAY AND TUESDAY ACROSS THE COASTAL WATERS AS HIGH PRESSURE SHIFTS OFFSHORE WELL NORTH OF THE REGION. A WARM FRONT WILL LIFT NORTH ACROSS THE AREA LATE TUESDAY...ALLOWING THE FLOW TO SHIFT MORE TO THE SOUTH/SOUTHWEST INTO THE MIDDLE OF THE WEEK. WIND SPEEDS SHOULD GENERALLY REMAIN AROUND 15 KT OR LESS WITH SEAS RANGING 2-4 FT MONDAY THROUGH WEDNESDAY. && .FIRE WEATHER... WE CONTINUE TO SUPPORT ONGOING WILDFIRE ACTIVITIES ON WASSAW ISLAND...FLORHAMMOCK ISLAND AND BULLS ISLAND. NO FIRE WEATHER PARAMETERS ARE XPCTD TO DROP BELOW CRITICAL THRESHOLDS ALTHOUGH GUSTY WNDS AT BULLS ISLAND WILL PERSIST FOR A FEW MORE HRS. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...NONE. SC...NONE. MARINE...NONE. &&
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE CHARLESTON SC 1050 AM EDT SAT JUL 21 2007 AMZ354-374-GAZ114>119-137>141-221030- 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-TATTNALL-EVANS-INLAND BRYAN-COASTAL BRYAN-INLAND CHATHAM- COASTAL CHATHAM-LONG-INLAND LIBERTY-COASTAL LIBERTY-INLAND MCINTOSH- COASTAL MCINTOSH- 1050 AM EDT SAT JUL 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND SOUTHEAST GEORGIA. .DAY ONE...TODAY AND TONIGHT. STRONG/SEVERE THUNDERSTORMS...THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EARLY EVENING ACROSS PARTS OF SOUTHEAST GEORGIA. A FEW OF THE STORMS MAY BECOME STRONG WITH SMALL HAIL...FREQUENT CLOUD TO GROUND LIGHTNING AND GUSTY WINDS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. AMZ330-350-352-GAZ087-088-099>101-SCZ040-042>045-047>051-221030- 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-JENKINS-SCREVEN- CANDLER-BULLOCH-EFFINGHAM-ALLENDALE-HAMPTON-INLAND COLLETON- DORCHESTER-BERKELEY-INLAND JASPER-BEAUFORT-COASTAL COLLETON- CHARLESTON-COASTAL JASPER- 1050 AM EDT SAT JUL 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS...SOUTHEAST GEORGIA AND SOUTHEAST SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
844 AM EDT SAT JUL 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0840 AM WILDFIRE 5 SE SKIDAWAY ISLAND 31.88N 80.99W
07/21/2007 CHATHAM GA OTHER FEDERAL
U.S. FISH AND WILDLIFE SERVICE REPORTS TWO WILDFIRES
BURNING SOUTHEAST OF SKIDAWAY ISLAND. ONE IS BURNING ON
WASSAW ISLAND AND THE OTHER ON FLORAHAMMOCK ISLAND. FIRES
WERE FIRST DETECTED YESTERDAY AFTERNOON AND WERE MOST
LIKELY STARTED BY LIGHTNING.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
905 AM EDT SAT JUL 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0617 PM TSTM WND DMG 4 N CLAXTON 32.22N 81.90W
07/20/2007 EVANS GA LAW ENFORCEMENT
1 TREE REPORTED DOWN ON CHARLIE HOMES ROAD. TIME
ESTIMATED BASED ON RADAR.
&&
JRJPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
925 AM EDT SAT JUL 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0920 AM WILDFIRE 5 SE AWENDAW 32.99N 79.55W
07/21/2007 CHARLESTON SC OTHER FEDERAL
WILDFIRE IN PROGRESS ON BULLS ISLAND LOCATED IN THE
MIDDLE OF BULLS BAY. AT LEAST 10 ACRES BURNED SO FAR.
REPORTED BY U.S. FISH AND WILDLIFE.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
930 AM EDT SAT JUL 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0552 PM TSTM WND DMG 2 S RIDGELAND 32.45N 80.98W
07/20/2007 JASPER SC FIRE DEPT/RESCUE
1 TREE DOWN OFF I-95 NEAR MILE MARKER 18. TIME ESTIMATED
BASED ON RADAR.
&&
JRJPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1104 AM EDT SAT JUL 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0815 PM HAIL 6 WSW CROSS 33.29N 80.24W
07/20/2007 E1.00 INCH BERKELEY SC PUBLIC
QUARTER SIZE HAIL REPORTED. HAIL FELL FOR AROUND 10
MINUTES AND COVERED GROUND. TIME ESTIMATED BASED ON
RADAR.
&&
JRJSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHARLESTON SC 208 PM EDT SAT JUL 21 2007 GAZ088-100-211900- BULLOCH-SCREVEN- 208 PM EDT SAT JUL 21 2007 ...STRONG THUNDERSTORMS WILL IMPACT BULLOCH COUNTY AND SCREVEN COUNTY THROUGH 300 PM EDT... AT 205 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL...AND GUSTY WINDS OF 30 TO 40 MPH. THIS STORM WAS LOCATED NEAR SYLVANIA...MOVING SOUTH AT 10 MPH. AREAS IN AND AROUND ALTMAN...CAPTOLO...DOVER...HUNTERS...NEWINGTON AND SYLVANIA WILL BE IMPACTED THROUGH 300 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), 56 km away, was scanning. The volume nearest the first event began at 18:20 UTC.
2 thunderstorm wind. Local standard time, as filed.
A few trees were reported down on Annett School Road.
A few trees were reported down on Jenk Hill Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2007Every state in 2007This day in weather historyWarnings in Georgia, July 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: 47840, 47841.