After having no rain throughout the daytime of 8/10, which allowed me to go to Tybee with some friends, rain showers (some heavy) coming off the ocean moving NW started at 11:30PM. It looks like per radar that periods of rain may last til after midnight.
Followup: It turned out that several bands of rain, sometimes moderate or heavy, continued to come in from the SE over this area. There was heavy near and soon after midnight. And then while I was sleeping, this occurred, still another FF warning for still another band of heavy:
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
156 AM EDT MON AUG 11 2025
THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CHATHAM COUNTY IN SOUTHEASTERN GEORGIA...
JASPER COUNTY IN SOUTHEASTERN SOUTH CAROLINA...
* UNTIL 400 AM EDT.
* AT 156 AM EDT, DOPPLER RADAR INDICATED AN LARGE BAND OF SHOWERS
AND THUNDERSTORM WITH TORRENTIAL RAINFALL JUST OFF THE COAST OF
CHATHAM COUNTY. THIS BAND WILL MOVE ACROSS MUCH CHATHAM COUNTY
INTO PARTS OF JASPER COUNTY THROUGH 4 AM. THIS INCLUDES MUCH OF
THE SAVANNAH METRO AREA. AS MUCH AS 1 TO 3 INCHES OF RAIN COULD
FALL OVER A VERY SHORT PERIOD. THIS WILL RESULT IN URBAN FLOODING
AND FLASH FLOODING. ROAD CLOSURES ARE POSSIBLE, ESPECIALLY ACROSS
DOWNTOWN SAVANNAH.
HAZARD...FLASH FLOODING CAUSED BY THUNDERSTORMS.
SOURCE...RADAR INDICATED.
IMPACT...FLASH FLOODING OF SMALL CREEKS AND STREAMS, URBAN
AREAS, HIGHWAYS, STREETS AND UNDERPASSES AS WELL AS
OTHER POOR DRAINAGE AND LOW-LYING AREAS.
* SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
POOLER, BLUFFTON, TYBEE ISLAND, MIDTOWN SAVANNAH, DOWNTOWN
SAVANNAH, HUTCHINSON ISLAND, HUNTER ARMY AIRFIELD, WINDSOR FOREST,
WILMINGTON ISLAND AND COFFEE BLUFF.
————————
Then this statement was issued:
CHATHAM GA-JASPER SC-
326 AM EDT MON AUG 11 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 4 AM EDT EARLY THIS
MORNING FOR CHATHAM AND JASPER COUNTIES...
AT 326 AM EDT, DOPPLER RADAR INDICATED MODERATE TO LOCALLY HEAVY
RAIN FALLING OVER MUCH OF CHATHAM COUNTY. WHILE THE MOST INTENSE
RAIN HAS SHIFTED NORTH OF THE AREA, THE RISK FOR FLOODING CONTINUES.
AS MUCH AS 1 TO 2.5 INCHES OF RAIN HAS FALLEN IN SOME AREAS SINCE 2
AM.
HAZARD...FLASH FLOODING CAUSED BY THUNDERSTORMS.
SOURCE...RADAR INDICATED.
IMPACT...FLASH FLOODING OF SMALL CREEKS AND STREAMS, URBAN AREAS,
HIGHWAYS, STREETS AND UNDERPASSES AS WELL AS OTHER POOR
DRAINAGE AND LOW-LYING AREAS.
SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
POOLER, BLUFFTON, TYBEE ISLAND, MIDTOWN SAVANNAH, DOWNTOWN
SAVANNAH, HUTCHINSON ISLAND, HUNTER ARMY AIRFIELD, WINDSOR FOREST,
WILMINGTON ISLAND AND COFFEE BLUFF.