The combination of forcing associated with a surface front and mid-level energy along with deep moisture residing across the area led to an environment capable of producing heavy rainfall across Southeast South Carolina.
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.
The combination of forcing associated with a surface front and mid-level energy along with deep moisture residing across the area led to an environment capable of producing heavy rainfall across Southeast South Carolina.
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, 5:12 AM EST, 4 hours 7 minutes earlier.
Area Forecast Discussion National Weather Service Charleston SC 612 AM EDT Mon Aug 11 2025 .SYNOPSIS... A stationary front to the south of the region should dissipate today. By mid to late week, surface high pressure will shift into the Atlantic, while weak troughing forms inland. && .NEAR TERM /THROUGH TONIGHT/... The upper-level anticyclone that has been positioned well offshore of the Southeast U.S. for the past several days will begin to build west today and replace the mid-level weakness that has been in place since last Friday. The atmosphere will remain modestly unstable through the afternoon with a plume rich, tropical moisture featuring PWATs holding in the 2.30-2.65". Similar to the past few days, passing bits of vorticity propagating along the western periphery of the upper high will bring several more bands/waves to showers/tstms to the area. Pops today peak 70-90% with 30-50% tonight. Models have been struggling on the exact timing, coverage and placement of these convective clusters which is impacting the ability to pin down where the corridors of heaviest rainfall will set up. The highest rain totals since Friday have been mostly confined to the coastal counties which should continue again today. Some areas have seen as much as foot of rain over the past several days alone which is downright incredible for August outside of a tropical cyclone. Although the net QPF will feature lower overall values through the afternoon with an overall more progressive convective pattern, HREF neighborhood probabilities still support localized amounts >4" where pockets of convective training occur. The risk for flash flooding will remain elevated as a result, especially in the more urbanized areas around Charleston, Beaufort, Savannah and Hinesville. The Flood Watch for the coastal counties has therefore been extended until 6 PM. This may be a bit long for parts of the Georgia coast where much of the convection may push north of there by late morning/early afternoon, so parts of the watch may need to be cleared early. The risk for heavy rainfall/flooding will linger along the lower South Carolina coast until mid-late afternoon. Convection may very well well redevelop over the Atlantic overnight into the early morning hours Tuesday, but current indications suggest coverage will be considerably less than the past several nights. Highs today will range from the lower-mid 80s across the South Carolina Lowcountry with mid-upper 80s across Southeast Georgia. Even a few spots near the Altamaha River could reach 90 with heat indices of 100-103. Overnight lows will range from the lower 70s well inland to the upper 70s/near 80 at the beaches and Downtown Charleston. && .SHORT TERM /TUESDAY THROUGH THURSDAY/... High pressure aloft centered over the western Atlantic will extend into the southeastern states on Tuesday, with the center slowly shifting westward towards the coastline through Thursday. Similarly, high pressure will prevail at the surface. This pattern will support a return to a more typical summertime pattern of diurnally driven showers and thunderstorms and hot and humid conditions. Strong to marginally severe thunderstorms will be possible each afternoon, with CAPE values around 2000 J/kg. There is also the threat of locally heavy rainfall, with PWAT values around 2". Heat index values are forecast to reach triple digits across portions of the region through the period, however the current forecast keeps conditions shy of Heat Advisory criteria. && .LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/... High pressure will dominate at the surface and aloft into the weekend. This pattern should yield a typical summer-time pattern with afternoon thunderstorms and hot and humid conditions. Heat index values will reach triple digits, with 100-105F in the forecast, shy of Heat Advisory criteria. && .AVIATION /10Z MONDAY THROUGH FRIDAY/... 11/12z TAF Discussion: KCHS/KJZI/KSAV: Unsettled conditions will persist at the terminals today with bands of showers/tstms poised to cross the area. Conditions look to remain largely VFR, except MVFR during periods of rain. Bulk of shower/tstm activity looks to clear KSAV by mid-morning and mid-afternoon at KCHS/KJZI. Various TEMPO groups were used to highlight MVFR conditions in RA during these times. Risk for tstms is there, but probabilities are too low to mention at this time. Extended Aviation Outlook: Brief flight restrictions will be possible due to afternoon showers/thunderstorms. && .MARINE... Through Tonight: No concerns. East/southeast winds 15 kt or less will prevail with seas 2-4 ft. Vsbys could drop below 1 NM at times in pockets of heavy rainfall. Tuesday through Saturday: High pressure will prevail over the local waters through the week. The forecast features winds SE/S around 10 to 15 knots. Some gusts could approach 20 knots along the coastline due to the afternoon sea breeze. Seas should average 2 to 3 ft. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...Flood Watch until 6 PM EDT this evening for GAZ116>119-138>141. SC...Flood Watch until 6 PM EDT this evening for SCZ048>051. MARINE...None. &&
Hazardous Weather Outlook National Weather Service Charleston SC 601 AM EDT Mon Aug 11 2025 GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-121015- 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- 601 AM EDT Mon Aug 11 2025 This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...Today and tonight. See the Graphical Hazardous Weather Outlook for more information about the following possible hazardous weather: - Excessive Rainfall .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. The probability for widespread hazardous weather is low. && The Graphical Hazardous Weather Outlook can be found at: https://www.weather.gov/erh/ghwo/?wfo=chs
Special Weather Statement
National Weather Service Charleston SC
810 AM EDT Mon Aug 11 2025
SCZ043-044-049-050-111245-
Charleston SC-Coastal Colleton SC-Dorchester SC-Inland Colleton
SC-
810 AM EDT Mon Aug 11 2025
...A STRONG THUNDERSTORM WILL IMPACT COLLETON...CHARLESTON AND
DORCHESTER COUNTIES UNTIL 845 AM EDT...
At 810 AM EDT, Doppler radar was tracking a strong thunderstorm over
Adams Run, moving north at 20 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Hollywood, Ravenel, Meggett, Adams Run, Yonges Island, Bears
Bluff, Delemar Crossroads, Jacksonboro, Parkers Ferry and Capwells
Crossroads.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Stay tuned to NOAA Weather Radio All Hazards, TV or your local news
source for the latest information from the National Weather Service.
&&
LAT...LON 3273 8048 3289 8049 3284 8015 3256 8023
3260 8047
TIME...MOT...LOC 1210Z 175DEG 19KT 3270 8036
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
CBSpecial Weather Statement
National Weather Service Charleston SC
908 AM EDT Mon Aug 11 2025
SCZ043>045-050-052-111400-
Dorchester SC-Tidal Berkeley SC-Inland Berkeley SC-Charleston SC-
Inland Colleton SC-
908 AM EDT Mon Aug 11 2025
...A STRONG THUNDERSTORM WILL IMPACT BERKELEY...COLLETON...
CHARLESTON AND DORCHESTER COUNTIES UNTIL 10 AM EDT...
At 908 AM EDT, Doppler radar was tracking a strong thunderstorm over
Summerville, moving north at 25 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
North Charleston, Summerville, Goose Creek, Hanahan, Moncks
Corner, Ladson, Givhans Ferry State Park, I-26/I-526 Interchange,
Naval Weapons Station Charleston and West Ashley.
This includes the following highways...
I-26 between mile markers 183 and 215.
I-526 between mile markers 11 and 20.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Stay tuned to NOAA Weather Radio All Hazards, TV or your local news
source for the latest information from the National Weather Service.
&&
LAT...LON 3305 8041 3325 8037 3322 7986 3279 8003
3286 8045
TIME...MOT...LOC 1307Z 187DEG 21KT 3301 8019
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
CBThe Charleston,SC radar (KCLX), 104 km away, was scanning. The volume nearest the first event began at 14:21 UTC.
11 flash flood, 1 lightning. Local standard time, as filed.
Emergency management reported Ogier Street closed between Calhoun Street and Vanderhorst Street due to flooding.
Emergency management reported the intersection of King Street and Huger Street closed due to flooding.
Emergency management reported Rutledge Avenue closed between Peachtree Street and Grove Street due to flooding.
Emergency management reported Calhoun Street closed between Pitt Street and Ashley Avenue due to flooding.
Emergency management reported several vehicles stranded in floodwaters along King Street and Huger Street.
Emergency management reported Washington Street closed between Laurens Street and Society Street due to flooding.
Emergency management reported 29 different road closures across the city of Charleston due to flooding.
An online scanner broadcast indicated two cars flooded near the intersection of Elmwood Avenue and Moultrie Street.
Emergency management reported the intersection of Huger Street and Meeting Street closed due to flooding.
An online scanner broadcast indicated that an occupied ambulance on Johnathan Lucas Street was flooded.
Emergency management reported power lines down and transformer blown due to a lightning strike along Highway 17 between South Shellmore Boulevard and Dragoon Drive.
Emergency management reported 3 vehicles stranded in floodwaters on Bowman Road near the intersection with Highway 17.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2025Every state in 2025This day in weather historyWarnings in South Carolina, August 2025
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 2026-10-01. Each event’s entry at NCEI: 1292239, 1292289, 1292291, 1292292, 1292295, 1292299, 1292301, 1292302, 1292303, 1292388, 1292390, 1292389.