Alert archive / South Carolina / Flash Flood Warnings in 2012
Flash Flood Warning 10, NWS Charleston, SC
NWS Charleston, SC issued this flash flood warning at Aug 29, 2012, 7:45 PM EDT for 4 counties in South Carolina. It was in force for 3 hr. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 29, 2012, 7:45 PM EDT (23:45 UTC)
- Expired
- Aug 29, 2012, 10:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC
The radar
The Charleston,SC radar (KCLX), 102 km from the middle of the area, began a volume at 23:46 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 29, 8:20 PM EDT | FLASH FLOOD | Charleston, SC | ASHLEY AVENUE AT BENNETT STREET WAS FLOODED AND IMPASSABLE. POLICE WERE CLOSING PARTS OF MORRISON DRIVE...MARKET STREET AND CHURCH STREET. |
| Aug 29, 8:34 PM EDT | FLASH FLOOD | Mount Pleasant, SC | PUBLIC REPORT OF AT LEAST 2 FEET OF WATER ON COLEMAN BLVD IN FRONT OF MOULTRIE MIDDLE SCHOOL. |
| Aug 29, 8:50 PM EDT | FLASH FLOOD | 1 Wnw Charleston, SC | THE FOLLOWING STREETS ARE FLOODED AND CLOSED...AMERICA AND RIED...PRESIDENT AT THE CROSSTOWN...CONCORD AND HAZEL...MARKET STREET...ASHLEY AND BENNETT. |
| Aug 29, 8:54 PM EDT | FLASH FLOOD | Downtown Charleston, SC | THE FOLLOWING STREETS ARE FLOODED BUT PASSABLE... CROSSTOWN... AMERICA AND MARY... AMERICA AND SOUTH... COLUMBUS AND AIKEN... PRESIDENT AND BOGARD... PRESIDENT AND LINE... STUART AND MORRISON... ASHLEY AND CALHOUN... RUTLEGE AND SIMMONS... CANNON AND COURTENAY |
| Aug 29, 9:08 PM EDT | FLASH FLOOD | 1 N Charleston, SC | THE FOLLOWING INTERSECTIONS WERE CLOSED DUE TO FLOODING...HUGER AND KING AND HUGER AND MEETING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 12:00Z, 11.8 hours before the alert went out and 8 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1031 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 627 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
114
WGUS52 KCHS 292345
FFWCHS
SCC015-019-029-035-300245-
/O.NEW.KCHS.FF.W.0010.120829T2345Z-120830T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
745 PM EDT WED AUG 29 2012
THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL BERKELEY COUNTY IN SOUTHEAST SOUTH CAROLINA...
CENTRAL CHARLESTON COUNTY IN SOUTHEAST SOUTH CAROLINA...
EAST CENTRAL COLLETON COUNTY IN SOUTHEAST SOUTH CAROLINA...
SOUTHEASTERN DORCHESTER COUNTY IN SOUTHEAST SOUTH CAROLINA...
* UNTIL 1045 PM EDT
* AT 744 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
VERY HEAVY RAIN OCCURRING ALONG A LINE FROM COTTAGEVILLE
TO CHARLESTON NAVAL COMPLEX. THE AREA OF HEAVY RAIN WAS DRIFTING
SOUTH AT 5 TO 10 MPH. BETWEEN 1 AND 3 INCHES OF RAIN HAS ALREADY
FALLEN FROM COTTAGEVILLE TO MIDDLETON PLACE. AN ADDITIONAL 2 TO
3 INCHES COULD FALL THROUGH 1045 PM...RESULTING IN FLASH FLOODING.
THE HEAVY RAIN IS EXPECTED TO DRIFT SOUTH INTO THE CHARLESTON METRO
AREA. HEAVY RAIN...COMBINED WITH SATURATED SOIL FROM FLOODING
EXPERIENCED TUESDAY AS WELL AS HIGH TIDE WILL RESULT IN AN
ENHANCED RISK FOR FLASH FLOODING IN THE DOWNTOWN CHARLESTON...WEST
ASHLEY AND MOUNT PLEASANT AREAS.
* FLASH FLOODING IS EXPECTED IN AND AROUND...
COTTAGEVILLE...SUMMERVILLE...WEST ASHLEY...NORTH CHARLESTON...
DOWNTOWN CHARLESTON...JOHNS ISLAND...JAMES ISLAND...MOUNT
PLEASANT...WILD DUNES...ISLE OF PALMS...
* FLASH FLOODING IS EXPECTED IN AND AROUND...
MAGNOLIA GARDENS...NORTH CHARLESTON...I-26/I-526 INTERCHANGE...
MIDDLETON PLACE...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AVOID DRIVING INTO WATER ON THE ROAD. THE WATER IS USUALLY DEEPER
THAN IT APPEARS AND THE ROAD MAY BE WASHED OUT. ONLY ONE FOOT OF
WATER WILL STALL A VEHICLE AND LESS THAN TWO FEET OF WATER CAN FLOAT
AND CARRY AWAY A VEHICLE. FLOODING IS THE NUMBER ONE WEATHER-RELATED
CAUSE OF DEATH IN THE UNITED STATES. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
TO REPORT FLOODING...CONTACT THE NATIONAL WEATHER SERVICE IN
CHARLESTON TOLL FREE AT 1-888-383-2024.
&&
LAT...LON 3279 7973 3277 7981 3275 7984 3275 7986
3272 7986 3272 8010 3282 8052 3303 8048
3304 8018 3299 7995 3285 7991 3283 7970
$$2 follow-up statements
937
WGUS72 KCHS 300023
FFSCHS
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
823 PM EDT WED AUG 29 2012
SCC015-019-029-035-300245-
/O.CON.KCHS.FF.W.0010.000000T0000Z-120830T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DORCHESTER SC-CHARLESTON SC-BERKELEY SC-COLLETON SC-
823 PM EDT WED AUG 29 2012
...DANGEROUS FLOODING MAY DEVELOP IN DOWNTOWN CHARLESTON...
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FOR EAST
CENTRAL COLLETON...SOUTH CENTRAL BERKELEY...CENTRAL CHARLESTON AND
SOUTHEASTERN DORCHESTER COUNTIES...
AT 823 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
EXTREMELY HEAVY RAIN EXTENDING FROM COTTAGEVILLE TO DOWNTOWN
CHARLESTON TO ISLE OF PALMS. RAINFALL AMOUNTS OF 2 TO AS MUCH AS
5 INCHES WILL BE POSSIBLE THROUGH 1045 PM ACROSS PARTS OF THE
WARNED REA. AS OF 8 PM...NEARLY 6 INCHES OF RAIN HAD FALLEN
AT THE MOUNT PLEASANT REGIONAL AIRPORT.
THE RISK FOR FLASH FLOODING WILL BE ESPECIALLY HIGH IN THE WEST
ASHLEY...DOWNTOWN CHARLESTON AND MOUNT PLEASANT AREAS AS TIDES
REMAIN ELEVATED. SOME ROADS IN THE DOWNTOWN CHARLESTON AREA ARE
ALREADY BEING CLOSED BY LOCAL EMERGENCY OFFICIALS. THIS INCLUDES
PARTS OF MORRISON DRIVE...MARKET STREET AND CHURCH STREET.
FLASH FLOODING IS EXPECTED IN AND AROUND...
COTTAGEVILLE...SUMMERVILLE...WEST ASHLEY...NORTH CHARLESTON...
DOWNTOWN CHARLESTON...JOHNS ISLAND...JAMES ISLAND...MOUNT
PLEASANT...WILD DUNES...ISLE OF PALMS...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A POTENTIALLY DANGEROUS SITUATION.
HIGH TIDE WILL INHIBIT RUNOFF OF HEAVY RAIN...FLOODING AREAS OF POOR
DRAINAGE IN DOWNTOWN CHARLESTON. AREAS MOST PRONE TO FLOODING INCLUDE
THE MARKET...CROSSTOWN...EAST BAY STREET AND MORRISON DRIVE.
&&
LAT...LON 3279 7973 3277 7981 3275 7984 3275 7986
3272 7986 3272 8010 3282 8052 3303 8048
3304 8018 3299 7995 3285 7991 3283 7970
$$397
WGUS72 KCHS 300239
FFSCHS
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1039 PM EDT WED AUG 29 2012
SCC015-019-029-035-300246-
/O.EXP.KCHS.FF.W.0010.000000T0000Z-120830T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DORCHESTER SC-CHARLESTON SC-BERKELEY SC-COLLETON SC-
1039 PM EDT WED AUG 29 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM EDT FOR FOR EAST
CENTRAL COLLETON...SOUTH CENTRAL BERKELEY...CENTRAL CHARLESTON AND
SOUTHEASTERN DORCHESTER COUNTIES...
...FLASH FLOOD WATCH IN EFFECT UNTIL 5 AM EDT THURSDAY...
THE HEAVIEST RAINS HAVE PUSHED OFFSHORE AND THE RISK FOR NEAR TERM
FLASH FLOODING HAS ENDED. HOWEVER...RADAR SHOWS ADDITIONAL SHOWERS
AND THUNDERSTORMS BEGINNING TO MOVE INTO SOUTHWEST CHARLESTON
COUNTY...SOUTHERN COLLETON COUNTY AND EASTERN BEAUFORT COUNTY...
WHICH MAY IMPACT MUCH OF THE PREVIOUSLY WARNED AREA BY MIDNIGHT.
A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 5 AM THURSDAY.
ALTHOUGH THE SIGNIFICANT FLOODING HAS ENDED...DRAINAGE SYSTEMS AND
CULVERTS WILL REMAIN FULL. PONDING WATER WILL PERSIST IN LOW-LYING
AREAS AND MAY POSE A HAZARD TO MOTORISTS. STAY TUNED TO NOAA WEATHER
RADIO ALL-HAZARDS FOR THE LATEST WEATHER INFORMATION.
LAT...LON 3279 7973 3277 7981 3275 7984 3275 7986
3272 7986 3272 8010 3282 8052 3303 8048
3304 8018 3299 7995 3285 7991 3283 7970
$$The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 3:22 AM EDT | Flash Flood Watch | CHS | 22 hr | |
| Aug 29, 3:45 PM EDT | Special Weather Statement | CHS | Berkeley | 30 min |
| Aug 29, 4:52 PM EDT | Areal Flood Advisory | CHS | Berkeley | 83 min |
| Aug 29, 6:36 PM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston | 54 min |
| Aug 29, 6:52 PM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston, Colleton, Dorchester | 83 min |
| Aug 29, 7:05 PM EDT | Flash Flood Warning | CHS | Berkeley, Charleston | 3 hr |
| Aug 29, 7:58 PM EDT | Special Weather Statement | CHS | Allendale | 32 min |
Nearby
Flash Flood Warnings in South Carolina, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.