Alert archive / South Carolina / Flash Flood Warnings in 2012

Flash Flood Warning 7, NWS Charleston, SC

August 28, 2012Berkeley County, Charleston County, South Carolina

NWS Charleston, SC issued this flash flood warning at Aug 28, 2012, 11:36 AM EDT for Berkeley County, Charleston County, South Carolina. It was in force for 12 hr. 23 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 28, 2012, 11:36 AM EDT (15:36 UTC)
Expired
Aug 28, 2012, 11:56 PM EDT
In force
12 hr
Issued by
NWS Charleston, SC
Area
Storm-based polygon
Flood severity
None

Counties Berkeley County, SC, Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 109 km from the middle of the area, began a volume at 15:38 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

TimeReportWhereRemark
Aug 28, 11:42 AM EDTFLASH FLOOD1 Ene James Island Coun, SCBROADCAST MEDIA RELAYED FIRE RESCUE REPONDING TO A STRANDED VEHICLE ON HUNLEY AVENUE NEAR FOLLY ROAD.
Aug 28, 11:45 AM EDTFLASH FLOOD1 Nnw Charleston, SCSPOTTER REPORTS ROAD IMPASSABLE ALONG KING STREET NEAR HUGER STREET IN DOWNTOWN CHARLESTON.
Aug 28, 12:05 PM EDTFLASH FLOOD1 Wnw West Ashley, SCSC HIGHWAY PATROL REPORTS SAVAGE ROAD NEAR I-526 CLOSED DUE TO FLOODING.
Aug 28, 12:15 PM EDTFLASH FLOODDowntown Charleston, SCCHARLESTON EM REPORTED 20 SEPARATE STRANDED VEHICLES IN AND AROUND DOWNTOWN THAT POLICE AND FIRE DEPT CREWS ARE REPONDING TO AT THIS TIME.
Aug 28, 12:27 PM EDTFLASH FLOOD1 Wsw Mount Pleasant, SCCOLEMAN BOULEVARD NEAR MOULTRIE MIDDLE SCHOOL HAS BEEN CLOSED DUE TO FLOODING.
Aug 28, 12:33 PM EDTFLASH FLOOD2 Wsw North Charleston, SCCHARLESTON COUNTY DISPATCH REPORTED FLOODING AND STRANDED VEHICLES ON AZALEA DRIVE FROM COSGROVE AVENUE TO MEETING STREET...INCLUDING INDUSTRIAL AVENUE.
Aug 28, 12:45 PM EDTHEAVY RAIN 4.392 E Charles Towne Landi, SCCOCORAHS OBSERVER MEASURED 4.39 INCHES OF RAIN IN THE LAST 4 HOURS.
Aug 28, 12:46 PM EDTFLOOD1 Ssw Shadowmoss, SC3.49 INCHES OF RAIN FELL IN 90 MINUTES. EXTENSIVE YARD FLOODING THROUGHOUT THE NEIGHBORHOOD
Aug 28, 12:46 PM EDTHEAVY RAIN 3.491 Ssw Shadowmoss, SC3.49 INCHES OF RAIN FELL IN 90 MINUTES. EXTENSIVE YARD FLOODING THROUGHOUT THE NEIGHBORHOOD
Aug 28, 2:18 PM EDTHEAVY RAIN 4.58Downtown Charleston, SCCOLLEGE OF CHARLESTON OBSERVATORY.
Aug 28, 2:30 PM EDTHEAVY RAIN 62 Se West Ashley, SC
Aug 28, 2:42 PM EDTFLASH FLOODDowntown Charleston, SCNUMEROUS ROADS REMAIN FLOODED...WATER HAS ENTERED MANY HOMES AND BUSINESSES. WATER RESCUES ARE STILL ONGOING. MARKET AREA COMPLETELY FLOODED.
Aug 28, 2:50 PM EDTFLASH FLOOD1 W West Ashley, SCWATER ENTERING HOMES ON HAZELWOOD DRIVE.
Aug 28, 3:09 PM EDTHEAVY RAIN 7.5Daniel Island, SCRELAYED BY LOCAL MEDIA FROM LOCAL SPOTTER. LOCATION OFF CLEMENTS FERRY ROAD.
Aug 28, 3:33 PM EDTHEAVY RAIN 4.032 W James Island, SCRAINFALL FROM 8 AM TO 330 PM.
Aug 28, 3:34 PM EDTFLASH FLOOD1 Nne North Charleston, SCNORTH CHARLESTON ROADS FLOODED...NOISETTE BLVD AND VIRGINIA. MCMILLAN TO NOISETTE AND ST. JOHNS. BUIST AT PARK PLACE. VIADUCT AND HOBSON.
Aug 28, 3:55 PM EDTFLASH FLOOD1 Nne Maybank Bridge, SCEMORY AVENUE FLOODED AND ONLY PASSAGE BY TALL TRUCKS. MANY YARDS FLOODED AND WATER SURROUNDING SOME HOMES.
Aug 28, 4:37 PM EDTHEAVY RAIN 7.52 Se West Ashley, SCSPOTTER MEASURED 7.50 INCHES OF RAIN BEFORE GAUGE OVERFLOWED.
Aug 28, 5:05 PM EDTFLASH FLOODDowntown Charleston, SCCITY OF CHARLESTON EMERGENCY MANAGER REPORTS PORTIONS OF THE FOLLOWING ARE STILL CLOSED DUE TO FLASH FLOODING... HAGOOD... PRESIDENT... FISHBURNE... HUGER... KING... GADSON... ASHLEY... BENNETTE... HENRY... WENTWORTH... GADSON... CROSSTOWN. EMERGENCY PERSONNEL
Aug 28, 7:25 PM EDTFLASH FLOODDowntown Charleston, SCNUMEROUS ROADS REMAIN CLOSED THROUGHOUT DOWNTOWN CHARLESTON PER CITY OF CHARLESTON EMERGENCY MANAGER. DRAINAGE OF FLOOD WATERS HAS CEASED DUE TO HIGH TIDE.
Aug 28, 7:29 PM EDTHEAVY RAIN 3.841 Se Mount Pleasant Tow, SCRAINFALL FROM 1030 AM TO 725 PM.
Aug 28, 8:30 PM EDTFLASH FLOODDowntown Charleston, SCCOLLEGE OF CHARLESTON EMERGENCY MANAGER REPORTS THAT AT LEAST 11 BUILDINGS ON THE CAMPUS HAVE SUSTAINED DAMAGE FROM FLASH FLOODING. FLOOD WATERS ARE STILL IN PLACE ACROSS MUCH OF THE CAMPUS.
Aug 28, 10:43 PM EDTFLASH FLOODDowntown Charleston, SCNUMEROUS STREETS REMAINED FLOODED AND CLOSED IN DOWNTOWN CHARLESTON INCLUDING PORTIONS OF...THE CROSSTOWN... PRESIDENT... LINE... ASHLEY... CALHOUN... HUGER... KING... BARRE... GADSON AND WENTWORTH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 14 storm reports to this flash flood warning; the first came 6 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 3.6 hours before the alert went out and 21 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.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2012-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 773 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2012-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
773 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
741 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

417 
WGUS52 KCHS 281536
FFWCHS
SCC015-019-281830-
/O.NEW.KCHS.FF.W.0007.120828T1536Z-120828T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
1136 AM EDT TUE AUG 28 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...

* UNTIL 230 PM EDT

* AT 1129 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  VERY HEAVY RAIN OCCURRING AROUND THE DOWNTOWN CHARLESTON AREA. AS  
  MUCH AS 2 TO 3 INCHES OF RAIN HAS ALREADY FALLEN THIS MORNING AND  
  AN ADDITIONAL 2 MORE INCHES IS POSSIBLE THROUGH EARLY AFTERNOON. 

* FLASH FLOODING IS EXPECTED IN AND AROUND...
  WEST ASHLEY...DOWNTOWN CHARLESTON...DANIEL ISLAND...AND MOUNT      
  PLEASANT.

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 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$

BSH
10 follow-up statements
615 
WGUS72 KCHS 281603
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1203 PM EDT TUE AUG 28 2012

SCC015-019-281830-
/O.CON.KCHS.FF.W.0007.000000T0000Z-120828T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLESTON SC-BERKELEY SC-
1203 PM EDT TUE AUG 28 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM EDT FOR SOUTH
CENTRAL BERKELEY AND CENTRAL CHARLESTON COUNTIES...

AT 1157 AM EDT...EXTREMELY HEAVY RAINFALL CONTINUES ACROSS AREAS 
FROM WEST ASHLEY...TO NORTH CHARLESTON...DOWNTOWN CHARLESTON...AND 
MOUNT PLEASANT. TRAINED WEATHER SPOTTERS AND LOCAL LAW ENFORCEMENT 
OFFICIALS REPORT NUMEROUS ROADS AS IMPASSABLE IN THESE AREAS. 
FURTHERMORE...THERE ARE MULTIPLE REPORTS OF STALLED VEHICLES AND 
RESCUES TAKING PLACE. THIS IS AN EXTREMELY DANGEROUS AND LIFE 
THREATENING SITUATION AND ANYONE IN AND AROUND DOWNTOWN CHARLESTON 
SHOULD TAKE IMMEDIATE ACTION NOW.

RAINFALL AMOUNTS OF 3 INCHES OR MORE HAVE ALREADY FALLEN AND AN 
ADDITIONAL 2 TO 4 INCHES WILL BE POSSIBLE THROUGH THE EARLY 
AFTERNOON. 

FLASH FLOODING IS EXPECTED IN AND AROUND BOONE HALL PLANTATION...
CAINHOY...CHARLES TOWNE LANDING...CHARLESTON NAVAL COMPLEX...DANIEL
ISLAND...DON HOLT BRIDGE...DOWNTOWN CHARLESTON...FOLLY BEACH...FORT
JOHNSON...FORT SUMTER...I-26/I-526 INTERCHANGE...ISLE OF PALMS...
JAMES ISLAND...JAMES ISLAND COUNTY PARK...MAYBANK BRIDGE...MOUNT
PLEASANT...MOUNT PLEASANT REGIONAL AIRPORT...MOUNT PLEASANT TOWNE
CENTRE...NORTH CHARLESTON...SHADOWMOSS...SULLIVANS ISLAND...WANDO AND
WEST ASHLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE MAJORITY OF FLOOD DEATHS ARE DUE TO PEOPLE DRIVING INTO WATER OF
UNKNOWN DEPTH. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO
SWEEP VEHICLES OFF THE ROAD. EVEN MODERN SPORT UTILITY VEHICLES ARE
VULNERABLE TO FLOODING. TO AVOID THE RISK OF DEATH...FIND AN
ALTERNATE ROUTE IF THE ROAD IS FLOODED.

HOMES AND BUSINESSES WILL BEGIN TO FLOOD DUE TO THE TORRENTIAL
RAINFALL. IF YOU ARE IN A LOW-LYING AREA...BE PROACTIVE. RAISE
SENSITIVE ITEMS OFF THE GROUND BEFORE FLOODING BEGINS.

TO REPORT SIGNIFICANT FLOODING...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 OR EMAIL YOUR
REPORTS TO CHS.SKYWARN@NOAA.GOV. REPORTS CAN ALSO BE SENT THROUGH
TWITTER USING #WXREPORT.

&&

LAT...LON 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$

BSH
284 
WGUS72 KCHS 281706
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
106 PM EDT TUE AUG 28 2012

SCC015-019-281830-
/O.CON.KCHS.FF.W.0007.000000T0000Z-120828T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLESTON SC-BERKELEY SC-
106 PM EDT TUE AUG 28 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM EDT FOR SOUTH
CENTRAL BERKELEY AND CENTRAL CHARLESTON COUNTIES...

THIS IS A VERY DANGEROUS SITUATION.

AT 105 PM EDT...RADAR INDICATED VERY HEAVY RAINFALL CONTINUING TO 
FALL ACROSS THE WARNED AREA. RADAR RAINFALL ESTIMATES AND COCORAHS 
OBSERVERS INDICATE THAT WIDESPREAD RAINFALL AMOUNTS OF 3 TO 5 INCHES 
HAS FALLEN IN MUCH OF THE WARNED AREA SINCE 10 AM...WITH LOCAL 
AMOUNTS LIKELY WELL IN EXCESS OF 6 INCHES. REPORTS FROM LOCAL 
MEDIA...LAW ENFORCEMENT AND THE PUBLIC INDICATE NUMEROUS ROADS 
FLOODED AND IMPASSIBLE IN DOWNTOWN CHARLESTON AS WELL AS PARTS OF 
WEST ASHLEY AND MOUNT PLEASANT. IN ADDITION...THERE HAVE BEEN DOZENS 
OF PEOPLE RESCUED FROM THEIR VEHICLES AND A REPORT OF WATER ENTERING 
THE LOBBY OF THE STERN CENTER AT THE COLLEGE OF CHARLESTON. 

ANOTHER 1 TO 2 INCHES OF RAIN IS EXPECTED THROUGH 230 PM WHICH WILL 
ONLY EXACERBATE THE FLOODING PROBLEMS.

FLASH FLOODING IS EXPECTED IN AND AROUND DOWNTOWN CHARLESTON...FORT 
JOHNSON...JAMES ISLAND...MOUNT PLEASANT...NORTH CHARLESTON AND WEST 
ASHLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE MAJORITY OF FLOOD DEATHS ARE DUE TO PEOPLE DRIVING INTO WATER OF 
UNKNOWN DEPTH. EVEN MODERN SPORT UTILITY VEHICLES ARE VULNERABLE TO 
FLOODING. TURN AROUND...DONT DROWN.

SOME HOMES AND BUSINESSES WILL FLOOD AS A RESULT THE TORRENTIAL 
RAINFALL AND MANY ROADS WILL REMAIN FLOODED. IF YOU ARE IN A 
LOW-LYING AREA...BE PROACTIVE. RAISE SENSITIVE ITEMS OFF THE GROUND 
BEFORE FLOODING BEGINS.

&&

LAT...LON 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$
630 
WGUS72 KCHS 281749
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
149 PM EDT TUE AUG 28 2012

SCC015-019-281830-
/O.CON.KCHS.FF.W.0007.000000T0000Z-120828T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLESTON SC-BERKELEY SC-
149 PM EDT TUE AUG 28 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM EDT FOR SOUTH
CENTRAL BERKELEY AND CENTRAL CHARLESTON COUNTIES...

AT 145 PM EDT...LOCAL MEDIA AND LAW ENFORCEMENT OFFICIALS CONTINUE 
TO REPORT NUMEROUS ROADS FLOODED AND IMPASSIBLE IN DOWNTOWN 
CHARLESTON AND PORTIONS OF WEST ASHLEY AND MOUNT PLEASANT. EVEN 
THOUGH THE RAINFALL INTENSITY HAS DECREASED...ANY ADDITIONAL 
RAINFALL WILL ONLY WORSEN THE SITUATION. THE FLOODING OF NUMEROUS 
ROADS AND SOME HOMES AND BUSINESSES WILL CONTINUE THROUGH AT LEAST 
230 PM. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE MAJORITY OF FLOOD DEATHS ARE DUE TO PEOPLE DRIVING INTO WATER OF 
UNKNOWN DEPTH. EVEN MODERN SPORT UTILITY VEHICLES ARE VULNERABLE TO 
FLOODING. TO AVOID THE RISK OF DEATH...FIND AN ALTERNATE ROUTE IF 
THE ROAD IS FLOODED.

SOME HOMES AND BUSINESSES WILL FLOOD DUE TO THE HEAVY RAINFALL THAT 
HAS ALREADY OCCURRED ALONG WITH ANY ADDITIONAL RAINFALL. IF YOU ARE 
IN A LOW-LYING AREA...BE PROACTIVE. RAISE SENSITIVE ITEMS OFF THE 
GROUND BEFORE FLOODING BEGINS.

KEEP CHILDREN AWAY FROM STORM DRAINS...WATER CATCHMENTS...AND 
STREAMS. 

TO REPORT SIGNIFICANT FLOODING...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 OR EMAIL YOUR
REPORTS TO CHS.SKYWARN@NOAA.GOV. REPORTS CAN ALSO BE SENT THROUGH
TWITTER USING #WXREPORT.

&&

LAT...LON 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$
356 
WGUS52 KCHS 281826
FFWCHS
SCC015-019-282130-
/O.EXT.KCHS.FF.W.0007.000000T0000Z-120828T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
226 PM EDT TUE AUG 28 2012

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL BERKELEY COUNTY IN SOUTHEAST SOUTH CAROLINA...
  CENTRAL CHARLESTON COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 530 PM EDT

* AT 226 PM EDT...SPOTTERS AND EMERGENCY MANAGEMENT OFFICIALS
  CONTINUE TO REPORT WIDESPREAD FLASH FLOODING ACROSS MUCH
  OF CENTRAL CHARLESTON COUNTY AND PARTS OF SOUTH CENTRAL
  BERKELEY COUNTY. ROADS REMAIN FLOODED AND IMPASSABLE IN
  MANY AREAS AND FLOOD WATERS ARE STILL ENTERING SOME
  HOMES AND BUSINESSES. THE WORST FLOODING REMAINS CONFINED 
  TO DOWNTOWN CHARLESTON...WEST ASHLEY AND PARTS OF MOUNT PLEASANT.
  ALTHOUGH THE HEAVIEST RAINS HAVE ENDED FOR NOW...FLOOD WATERS
  WILL BE VERY SLOW TO RECEDE WITH HIGH TIDE APPROACHING.

* FLASH FLOODING IS EXPECTED IN AND AROUND...
  JAMES ISLAND...FOLLY BEACH...DOWNTOWN CHARLESTON...
  MOUNT PLEASANT...WEST ASHLEY...NORTH CHARLESTON...
  DANIEL ISLAND...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HOMES AND BUSINESSES MAY BEGIN TO FLOOD DUE TO THE TORRENTIAL
RAINFALL. IF YOU ARE IN A LOW-LYING AREA...BE PROACTIVE. RAISE
SENSITIVE ITEMS OFF THE GROUND BEFORE FLOODING BEGINS.
NEVER CROSS A ROAD THAT IS FLOODED. 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 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$
796 
WGUS72 KCHS 281945
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
345 PM EDT TUE AUG 28 2012

SCC015-019-282130-
/O.CON.KCHS.FF.W.0007.000000T0000Z-120828T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLESTON SC-BERKELEY SC-
345 PM EDT TUE AUG 28 2012

...A DANGEROUS FLASH FLOOD EVENT CONTINUES FOR THE CHARLESTON METRO 
AREA...
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR SOUTH
CENTRAL BERKELEY AND CENTRAL CHARLESTON COUNTIES...

AT 345 PM EDT...SPOTTERS...THE BROADCAST MEDIA AND EMERGENCY 
MANAGEMENT OFFICIALS INDICATE WIDESPREAD FLASH FLOODING PERSISTS 
ACROSS MUCH OF CENTRAL CHARLESTON AND PARTS OF SOUTH CENTRAL 
BERKELEY COUNTIES. NUMEROUS ROADWAYS REMAIN FLOODED...HOMES AND 
BUSINESSES ARE REPORTED FLOODED IN SOME AREAS AND WATER RESCUES ARE 
STILL IN PROGRESS. THE WORST FLASH FLOODING IS OCCURRING IN THE 
DOWNTOWN CHARLESTON...WEST ASHLEY AND MOUNT PLEASANT AREAS. ALTHOUGH 
THE HEAVIEST RAINS HAVE ENDED FOR NOW...FLOOD WATERS WILL BE VERY 
SLOW TO RECEDE WITH HIGH TIDE APPROACHING. HIGH TIDE WILL OCCUR IN 
THE CHARLESTON HARBOR AT 625 PM.

NATIONAL WEATHER SERVICE DOPPLER RADAR AND SPOTTER RAINFALL REPORTS 
INDICATE BETWEEN 4 AND 8 INCHES OF RAIN HAS FALLEN IN MANY AREAS 
TODAY. THIS IS A DANGEROUS SITUATION. HEED THE ADVISE OF LOCAL 
EMERGENCY MANAGEMENT OFFICIALS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE MAJORITY OF FLOOD DEATHS ARE DUE TO PEOPLE DRIVING INTO WATER OF
UNKNOWN DEPTH. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO
SWEEP VEHICLES OFF THE ROAD. EVEN MODERN SPORT UTILITY VEHICLES ARE
VULNERABLE TO FLOODING. TO AVOID THE RISK OF DEATH...FIND AN
ALTERNATE ROUTE IF THE ROAD IS FLOODED.

KEEP CHILDREN AWAY FROM STORM DRAINS...WATER CATCHMENTS...AND
STREAMS. ONLY A FEW INCHES OF MOVING WATER CAN KNOCK A CHILD OFF
THEIR FEET AND SWEEP THEM TO THEIR DEATH.

TO REPORT SIGNIFICANT FLOODING...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 OR EMAIL YOUR
REPORTS TO CHS.SKYWARN@NOAA.GOV. REPORTS CAN ALSO BE SENT THROUGH
TWITTER USING #WXREPORT.

&&

LAT...LON 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$
608 
WGUS52 KCHS 282123
FFWCHS
SCC015-019-290030-
/O.EXT.KCHS.FF.W.0007.000000T0000Z-120829T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
523 PM EDT TUE AUG 28 2012

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL BERKELEY COUNTY IN SOUTHEAST SOUTH CAROLINA...
  CENTRAL CHARLESTON COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 830 PM EDT

* AT 523 PM EDT...SPOTTERS AND EMERGENCY MANAGEMENT OFFICIALS   
  CONTINUE TO REPORT WIDESPREAD FLASH FLOODING ACROSS MUCH OF 
  CENTRAL CHARLESTON COUNTY AND PARTS OF SOUTH CENTRAL BERKELEY 
  COUNTY. ROADS REMAIN FLOODED AND IMPASSABLE IN MANY AREAS AND 
  FLOOD WATERS ARE STILL IN SOME HOMES AND BUSINESSES. THE 
  WORST FLOODING REMAINS CONFINED TO DOWNTOWN CHARLESTON...WEST 
  ASHLEY AND PARTS OF MOUNT PLEASANT. ALTHOUGH THE HEAVIEST RAINS 
  HAVE ENDED FOR NOW...FLOOD WATERS WILL BE VERY SLOW TO RECEDE WITH 
  HIGH TIDE APPROACHING. IN ADDITION...THUNDERSTORMS DEVELOPING
  ALONG THE SAVANNAH RIVER MAY IMPACT THE WARNING AREA LATER
  THIS EVENING.

* FLASH FLOODING IS EXPECTED IN AND AROUND...
  JAMES ISLAND...FOLLY BEACH...DOWNTOWN CHARLESTON...MOUNT 
  PLEASANT...WEST ASHLEY...NORTH CHARLESTON...DANIEL ISLAND...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

KEEP CHILDREN AWAY FROM STORM DRAINS...WATER CATCHMENTS...AND
STREAMS. ONLY A FEW INCHES OF MOVING WATER CAN KNOCK A CHILD OFF
THEIR FEET AND SWEEP THEM TO THEIR DEATH.

IF YOU ARE IN A LOW-LYING AREA...BE PROACTIVE. RAISE
SENSITIVE ITEMS OFF THE GROUND BEFORE FLOODING BEGINS.
NEVER CROSS A ROAD THAT IS FLOODED. 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 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$
554 
WGUS72 KCHS 282330
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
730 PM EDT TUE AUG 28 2012

SCC015-019-290030-
/O.CON.KCHS.FF.W.0007.000000T0000Z-120829T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLESTON SC-BERKELEY SC-
730 PM EDT TUE AUG 28 2012

...A DANGEROUS FLASH FLOOD EVENT CONTINUES FOR THE CHARLESTON METRO 
AREA...
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR SOUTH
CENTRAL BERKELEY AND CENTRAL CHARLESTON COUNTIES...

AT 730 PM EDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED THAT 
WIDESPREAD FLASH FLOODING PERSISTS ACROSS MUCH OF CENTRAL CHARLESTON 
AND PARTS OF SOUTH CENTRAL BERKELEY COUNTIES. NUMEROUS ROADWAYS AS 
WELL AS SOME HOMES AND BUSINESSES REMAIN FLOODED. THE WORST FLASH 
FLOODING IS OCCURRING IN THE DOWNTOWN CHARLESTON...WEST ASHLEY AND 
MOUNT PLEASANT AREAS. ALTHOUGH THE HEAVIEST RAINS HAVE ENDED FOR 
NOW...FLOOD WATERS WILL BE VERY SLOW TO RECEDE WITH HIGH TIDE IN 
PROGRESS. LIGHT TO MODERATE RAIN WILL MOVE BACK INTO THE CHARLESTON 
METRO AREA BY 830 PM. GIVEN THE CURRENT LEVEL OF FLOODING BEING 
OBSERVED...THE FLASH FLOOD WARNING MAY BE EXTENDED BEYOND 830 PM.

NATIONAL WEATHER SERVICE DOPPLER RADAR AND SPOTTER RAINFALL REPORTS 
INDICATE BETWEEN 4 AND 8 INCHES OF RAIN HAS FALLEN IN MANY AREAS 
TODAY. THIS IS A DANGEROUS SITUATION. HEED THE ADVISE OF LOCAL 
EMERGENCY MANAGEMENT OFFICIALS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE MAJORITY OF FLOOD DEATHS ARE DUE TO PEOPLE DRIVING INTO WATER OF 
UNKNOWN DEPTH. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO 
SWEEP VEHICLES OFF THE ROAD. EVEN MODERN SPORT UTILITY VEHICLES ARE 
VULNERABLE TO FLOODING. TO AVOID THE RISK OF DEATH...FIND AN 
ALTERNATE ROUTE IF THE ROAD IS FLOODED.

KEEP CHILDREN AWAY FROM STORM DRAINS...WATER CATCHMENTS...AND
STREAMS. ONLY A FEW INCHES OF MOVING WATER CAN KNOCK A CHILD OFF
THEIR FEET AND SWEEP THEM TO THEIR DEATH.

TO REPORT SIGNIFICANT FLOODING...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024 OR EMAIL YOUR
REPORTS TO CHS.SKYWARN@NOAA.GOV. REPORTS CAN ALSO BE SENT THROUGH
TWITTER USING #WXREPORT.

&&

LAT...LON 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$
772 
WGUS52 KCHS 290021
FFWCHS
SCC015-019-290430-
/O.EXT.KCHS.FF.W.0007.000000T0000Z-120829T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
821 PM EDT TUE AUG 28 2012

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL BERKELEY COUNTY IN SOUTHEAST SOUTH CAROLINA...
  CENTRAL CHARLESTON COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 1230 AM EDT

* AT 821 PM EDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED THAT 
  WIDESPREAD FLASH FLOODING PERSISTS ACROSS MUCH OF CENTRAL 
  CHARLESTON AND PARTS OF SOUTH CENTRAL BERKELEY COUNTIES. 
  NUMEROUS ROADWAYS AS WELL AS SOME HOMES AND BUSINESSES REMAIN 
  FLOODED. THE WORST FLOODING IS OCCURRING IN THE DOWNTOWN 
  CHARLESTON...WEST ASHLEY AND MOUNT PLEASANT AREAS. ALTHOUGH THE 
  HEAVIEST RAINS HAVE ENDED FOR NOW...FLOOD WATERS WILL BE VERY 
  SLOW TO RECEDE. BETWEEN 4 AND 8 INCHES OF RAIN HAS FALLEN
  ACROSS MUCH OF THE CHARLESTON METRO AREA SINCE EARLY AFTERNOON.
  ANY ADDITIONAL MODERATE TO HEAVY RAIN WILL LEAD TO ADDITIONAL
  FLOODING.

* FLASH FLOODING IS EXPECTED IN AND AROUND...
  JAMES ISLAND...FOLLY BEACH...DOWNTOWN CHARLESTON...MOUNT 
  PLEASANT...WEST ASHLEY...NORTH CHARLESTON...DANIEL ISLAND...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WATER DEPTH IS NEARLY IMPOSSIBLE TO DETERMINE AT NIGHT. DO NOT
ATTEMPT TO CROSS WATER ON THE ROADWAY EVEN IF IT APPEARS SHALLOW.
FIND AN ALTERNATE ROUTE. A SHORT DELAY IN YOUR TRAVEL PLANS IS BETTER
THAN LOSING YOUR CAR...OR YOUR LIFE.

TO REPORT FLOODING...CONTACT THE NATIONAL WEATHER SERVICE IN
CHARLESTON TOLL FREE AT 1-888-383-2024.

&&

LAT...LON 3277 7981 3275 7984 3275 7986 3273 7986
      3268 7988 3266 7990 3263 7997 3260 7999
      3260 8003 3287 8010 3299 7975 3281 7971

$$
471 
WGUS72 KCHS 290233
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1033 PM EDT TUE AUG 28 2012

SCC015-019-290430-
/O.CON.KCHS.FF.W.0007.000000T0000Z-120829T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLESTON SC-BERKELEY SC-
1033 PM EDT TUE AUG 28 2012

...WIDESPREAD FLASH FLOODING CONTINUES IN DOWNTOWN CHARLESTON...
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT FOR
EXTREME SOUTH CENTRAL BERKELEY AND CENTRAL CHARLESTON COUNTIES...

AT 1030 PM EDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED THAT   
WIDESPREAD FLASH FLOODING CONTINUED ACROSS MUCH OF CENTRAL  
CHARLESTON AND PARTS OF SOUTH CENTRAL BERKELEY COUNTIES. NUMEROUS 
ROADWAYS AS WELL AS SOME HOMES AND BUSINESSES REMAIN FLOODED. THE 
WORST FLOODING IS OCCURRING IN THE DOWNTOWN CHARLESTON...WEST ASHLEY 
AND MOUNT PLEASANT AREAS. FLOOD WATERS WILL BE SLOW TO RECEDE... 
ALTHOUGH STEADY IMPROVEMENTS ARE EXPECTED AS LOW TIDE APPROACHES. 
BETWEEN 4 AND 8 INCHES OF RAIN HAS FALLEN ACROSS MUCH OF THE 
CHARLESTON METRO AREA SINCE EARLY AFTERNOON. 

FLASH FLOODING IS EXPECTED IN AND AROUND...
JAMES ISLAND...DOWNTOWN CHARLESTON...MOUNT PLEASANT...WEST 
ASHLEY...NORTH CHARLESTON...DANIEL ISLAND...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WATER DEPTH IS NEARLY IMPOSSIBLE TO DETERMINE AT NIGHT. DO NOT
ATTEMPT TO CROSS WATER ON THE ROADWAY EVEN IF IT APPEARS SHALLOW.
FIND AN ALTERNATE ROUTE. A SHORT DELAY IN YOUR TRAVEL PLANS IS BETTER
THAN LOSING YOUR CAR...OR YOUR LIFE.

&&

LAT...LON 3270 7987 3269 7990 3269 7993 3269 7997
      3272 8003 3281 8003 3283 7994 3282 7986
      3278 7982 3277 7981 3275 7984 3275 7986
      3273 7986

$$
665 
WGUS72 KCHS 290356
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1156 PM EDT TUE AUG 28 2012

SCC015-019-290359-
/O.CAN.KCHS.FF.W.0007.000000T0000Z-120829T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLESTON SC-BERKELEY SC-
1156 PM EDT TUE AUG 28 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME SOUTH
CENTRAL BERKELEY AND CENTRAL CHARLESTON COUNTIES...

NO ADDITIONAL HEAVY RAIN IS EXPECTED OVERNIGHT. ALSO...LAW 
ENFORCEMENT REPORTED THAT HIGHWAY 17 HAD REOPENED IN CHARLESTON...
AND STANDING WATER SHOULD CONTINUE TO GRADUALLY RECEDE ON AREA ROADS 
OVERNIGHT.   

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. 

ADDITIONAL RAINFALL COULD DEVELOP AROUND DAYBREAK...AROUND THE TIME 
OF HIGH TIDE. CHECK WITH NOAA WEATHER RADIO ALL HAZARDS OR OTHER 
LOCAL MEDIA OUTLETS FOR UPDATED INFORMATION...INCLUDING POSSIBLE 
WARNINGS. 

LAT...LON 3270 7987 3269 7990 3269 7993 3269 7997
      3272 8003 3281 8003 3283 7994 3282 7986
      3278 7982 3277 7981 3275 7984 3275 7986
      3273 7986

$$

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Aug 28, 10:45 AM EDT, 51 minutes earlier.

Area forecast discussion, Aug 28, 10:45 AM EDT, 51 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
1045 AM EDT TUE AUG 28 2012

.SYNOPSIS...
TROPICAL CYCLONE ISAAC IS EXPECTED TO REMAIN WELL SOUTH AND WEST OF
THE REGION BUT WILL BRING DEEP TROPICAL MOISTURE AND ENHANCED RAIN
CHANCES TO THE AREA MUCH OF THIS WEEK. ATLANTIC HIGH PRESSURE WILL
TRY TO BUILD INTO THE REGION LATE THIS WEEK AND INTO THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
DEEP TROPICAL MOISTURE WILL REMAIN OVER THE AREA TODAY WITH HIGH
PRESSURE OVER THE MIDWEST AND WESTERN ATLANTIC...AND A TROUGH ALONG
THE NORTHEAST SEABOARD AS WELL AS TROPICAL CYCLONE ISAAC OVER THE
NORTH CENTRAL GULF OF MEXICO. WITH THESE FEATURES IN PLACE...MOIST
SOUTH/SOUTHEAST FLOW WILL PERSIST OVER SOUTHEAST SOUTH CAROLINA AND
SOUTHEAST GEORGIA THROUGH THIS EVENING SETTING UP FAVORABLE
CONDITIONS FOR WIDESPREAD SHOWERS/ISOLATED THUNDERSTORMS ALONG A
COASTAL CONVERGENCE ZONE. WITH PWATS REMAINING AROUND 2.5 INCHES
AND SFC DEWPTS REACHING THE MID 70S TODAY...SHOWERS AND/OR
THUNDERSTORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL BETWEEN
1-2 INCHES PER HOUR AND THE POTENTIAL FOR FLOODING...ESPECIALLY
ALONG COASTAL COUNTIES AS WE APPROACH HIGH TIDE THIS EVENING.

HIGH TEMPS WILL BE A BIT TRICKY THIS AFTERNOON BASED ON CLOUD COVER.
LATEST VIS SATELLITE IMAGERY INDICATES MODEST SFC HEATING SHOULD
OCCUR FOR LOCATIONS SOUTH OF THE SAVANNAH RIVER LATE THIS MORNING
INTO EARLY AFTERNOON. OVERALL...HIGH TEMPS WILL LIKELY REACH THE UPPER
80S OVER SOUTHEAST GEORGIA BEFORE CLOUD COVER REDEVELOPS IN A VERY
MOIST AIRMASS. FURTHER NORTH...CLOUD COVER WILL REMAIN AN ISSUE
THROUGHOUT MOST OF THE DAY. DESPITE A FEW BREAKS IN CLOUD COVER...HEAVY
RAIN/SHOWERS WILL LIKELY KEEP HIGH TEMPS IN THE MID 80S.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY/...
TONIGHT...SOME DRIER AIR WILL WORK INTO THE AREA FROM THE SOUTH
BUT A BACKDOOR COLD FRONT WILL BE APPROACHING FROM THE NORTH AT
THE SAME TIME. LOOKS LIKE THE BEST RAIN CHANCES WILL REMAIN ACROSS
SOUTHERN SOUTH CAROLINA WHERE THE DEEPER MOISTURE AND FRONTAL
CONVERGENCE WILL BE FOUND. THUS WILL HOLD ONTO LIKELY RAIN CHANCES
ACROSS THE CHARLESTON METRO BUT DIMINISH THEM THROUGH THE NIGHT
SOUTH OF THERE. LOWS MAINLY IN THE LOWER TO MID 70S.

MODELS APPEARS TO BE IN DECENT AGREEMENT WITH KEEPING DEEP TROPICAL
MOISTURE ACROSS THE REGION THROUGH THURSDAY AS THE REMNANTS OF ISAAC
MOVES SLOWLY NORTHWARD INTO THE SOUTHERN AND THEN CENTRAL MS RIVER
VALLEY. OUR REGION WILL BE ON THE EXTREME SOUTHERN END OF A BROAD
UPPER TROUGH CENTERED OVER NEW ENGLAND ON WEDNESDAY. THIS TROUGH
ALONG WITH A WEAK SURFACE BOUNDARY WILL SHIFT SOUTH AND EASTWARD
INTO THE ATLANTIC ON THURSDAY AS A BROAD UPPER RIDGE FORMS ACROSS
THE UPPER MID WEST AND OH RIVER VALLEY...NORTH OF THE REMNANT
CIRCULATION OF ISAAC. IT IS NOT UNCOMMON TO GET A MID AND UPPER
LEVEL RIDGE NORTH OF A DISSIPATING TROPICAL SYSTEM DUE TO THE
MASSIVE RELEASE OF LATENT HEAT FROM THE PRECIPITATION. THE MAJORITY
OF THE MODELS BUILD THIS RIDGE ON TOP OF THE REGION AS THE REMNANTS
OF ISAAC AND DEEP TROPICAL MOISTURE MOVE INTO THE CENTRAL PORTION
OF THE COUNTRY.

WEDNESDAY...GIVEN THE PRESENCE OF DEEP TROPICAL MOISTURE AND A BROAD
UPPER TROUGH AND SURFACE FRONT JUST NORTH OF THE REGION...HAVE
CONTINUED LIKELY POPS FOR MAINLY SHOWERS AND SOME THUNDERSTORMS.
LOCALLY HEAVY RAINFALL WILL CONTINUE TO BE A THREAT WITH THE
POTENTIAL FOR SOME MINOR LOW LAND FLOODING...ESPECIALLY DURING THE
LATE AFTERNOON/EARLY EVENING HIGH TIDE CYCLE OVER THE METRO AREAS OF
CHARLESTON AND SAVANNAH. TEMPS NEAR TO SLIGHTLY BELOW NORMAL GIVEN
CLOUD COVER AND LIKELY POPS. WEDNESDAY NIGHT...KEPT CHANCE POPS FOR
MAINLY SHOWERS SINCE THE TREND SEEMS TO BE FOR THE CONVECTIVE
COVERAGE TO DECREASE DURING THE OVERNIGHT HOURS. MINS NEAR NORMAL.

THURSDAY...AS THE DEEP LAYER RIDGE TRIES TO BUILD IN FROM THE NORTH
AND WEST...SOME DRYING IS EXPECTED TO OCCUR FROM NORTH TO SOUTH.
STILL ABUNDANT TROPICAL MOISTURE OVER AT LEAST THE SOUTHERN HALF OF
THE REGION. HAVE KEPT HIGH END CHANCE POPS...WITH A SLIGHTLY HIGHER
BIAS OVER THE GA ZONES. THURSDAY NIGHT...CONTINUED THE DOWNWARD POP
TREND AS DRIER AIR TRIES TO BUILD IN FROM THE NORTH. LOWS AGAIN NEAR
NORMAL.

FRIDAY...THE CONSENSUS FROM THE MEDIUM RANGE MODELS INDICATE THAT
THE DEEP LAYER RIDGE WILL BE ON TOP OF THE REGION...WITH DRIER
CONDITIONS. KEPT LOW END CHANCE POPS...AND THIS MAY NEED TO BE
ADJUSTED DOWNWARD IF CURRENT MODEL TRENDS CONTINUE. MAX TEMPS NEAR
TO SLIGHTLY ABOVE NORMAL GIVEN BUILDING RIDGE AND MORE SUNSHINE.

&&

.LONG TERM /FRIDAY NIGHT THROUGH MONDAY/...
FRIDAY NIGHT...KEPT SLIGHT CHANCE POPS WITH TEMPS NEAR NORMAL.
BY SATURDAY...THE UPPER RIDGE BEGINS TO WEAKEN AND SHIFT SOUTHEAST
OF THE AREA AS A BROAD UPPER TROUGH...WHICH PICKS UP THE REMNANT
MOISTURE OF ISAAC...FORM OVER THE OH RIVER VALLEY. WITH THE FALLING
UPPER HEIGHTS AND SOME INCREASE IN DEEP LAYER MOISTURE...HAVE KEPT
LOW END CHANCE POPS. BY SUNDAY THROUGH TUESDAY...FORECAST CONFIDENCE
BEGINS TO DROP OFF. FOR NOW...HAVE GONE WITH A SOLUTION THAT SHOWS A
WEAKENING UPPER TROUGH OVER THE REGION...WITH INCREASING DEEP LAYER
MOISTURE. HAVE KEPT LOW END CHANCE POPS...WHICH IS CLOSE TO CLIMO.
TEMPS AROUND CLIMO THROUGH THE PERIOD.

&&

.AVIATION /15Z TUESDAY THROUGH SATURDAY/...
DEEP TROPICAL MOISTURE WILL CONTINUE ACROSS THE AREA...RESULTING
IN PERIODS OF SHOWERS AND ISOLATED THUNDERSTORMS...ESPECIALLY
LATE THIS MORNING AND AFTERNOON. EXPECT PERIODS MVFR CIGS MUCH OF
THE DAY...ESPECIALLY WITHIN AREAS OF SHOWERS. COULD GET VERY BRIEF
IFR CIGS/VSBYS IN HEAVIER SHOWERS. THE BEST CHANCES FOR RAIN TODAY
STILL LOOKS TO BE OVER KCHS...WITH A LITTLE LESS COVERAGE EXPECTED
CLOSER TO KSAV. GOING WITH MAINLY VFR LATER THIS EVENING AND
TONIGHT AS CHANCES FOR PRECIP DIMINISH. HOWEVER...GIVEN DEEP
TROPICAL MOISTURE...NOT OUT OF THE QUESTION THAT MVFR CIGS COULD
RETURN LATER TONIGHT.

EXTENDED AVIATION OUTLOOK...BRIEF PERIODS OF MVFR OR LOWER
CONDITIONS WILL BE POSSIBLE THROUGH WEDNESDAY AT BOTH TERMINALS
WITH WIDESPREAD RAIN AND A FEW THUNDERSTORMS. CHANCES FOR
WIDESPREAD HEAVY RAINFALL BEGIN TO DIMINISH BY THURSDAY AND ARE
EXPECTED TO BE MUCH LESS FOR FRIDAY AND SATURDAY. THUS...VFR
EXPECTED TO BE MORE DOMINANT LATER THURSDAY THROUGH SATURDAY.

&&

.MARINE...
TODAY AND TONIGHT...A SLIGHTLY ENHANCED PRESSURE GRADIENT ACROSS THE
WATERS BETWEEN ATLANTIC HIGH PRESSURE AND TROPICAL STORM ISAAC OVER
THE GULF OF MEXICO WILL LEAD TO WINDS BETWEEN 15-20 KTS. EXPECT A
SLIGHT DECREASE IN WINDS THROUGH THE AFTERNOON AS ATLANTIC HIGH
PRESSURE CONTINUES TO BUILD OVER THE WESTERN ATLANTIC AND TROPICAL
CYCLONE ISAAC SHIFTS FURTHER NORTHWEST OVER THE GULF OF MEXICO.
THE MAIN ISSUE WILL CONTINUE TO BE SEAS WHICH ARE DOMINATED BY AN
EAST TO SOUTHEAST SWELL. EXPECT SEAS TO REMAIN NEAR 4-5 FEET
THROUGHOUT THE DAY...JUST BELOW ADVISORY LEVELS FOR WATERS BEYOND
20 NM. GIVEN THE EXPECTED TREND THIS AFTERNOON AND LATEST
OBSERVATIONS OF SEAS BETWEEN 4-5 FEET AT BUOY 41008...HAVE OPTED
TO END THE SMALL CRAFT ADVISORY FOR OUTER GEORGIA WATERS.

LATEST SPC MESOANALYSIS DATA INDICATES AN AXIS OF SBCAPE AROUND
3000 J/KG OVER THE WATERS LATE THIS MORNING. THIS IN COMBINATION
WITH PWATS NEAR 2.5 INCHES WILL CONTINUE TO PRODUCE WIDESPREAD
SHOWERS WITH ISOLATED THUNDERSTORMS THROUGH THIS EVENING. A FEW
THUNDERSTORMS MAY BE CAPABLE OF PRODUCING GUSTY WINDS OR AN
ISOLATED WATERSPOUT TODAY.

WEDNESDAY THROUGH SUNDAY...A WEAK ATLANTIC RIDGE CENTERED
SOUTHEAST OF THE AREA WILL HOLD OVER THE REGION WEDNESDAY. BY
THURSDAY...THE ATLANTIC RIDGE WILL WEAKEN AND SHIFT FURTHER
SOUTHEAST AS A WEAK SURFACE TROUGH/FRONT MOVES INTO THE REGION
FROM THE NORTH. ANOTHER RIDGE WILL BUILD FROM THE NORTH FRIDAY AND
PART OF SATURDAY...THEN A TROUGH OF LOW PRESSURE WILL BUILD BACK
OVER THE SOUTHEAST U.S. LATER SATURDAY AND SUNDAY.

OVERALL...WINDS ARE EXPECTED TO BE 15 KTS OR LESS AND SEAS GENERALLY
3 FEET OR LESS THROUGH THE PERIOD.

RIP CURRENTS...AN ELEVATED RISK FOR RIP CURRENTS WILL CONTINUE
THROUGH MID WEEK DUE TO ONSHORE WINDS...SWELLS AND THE UPCOMING FULL
MOON.

&&

.TIDES/COASTAL FLOODING...
MODELS CONTINUE TO INDICATE POSITIVE TIDAL ANOMALIES OF ABOUT ONE
HALF FOOT THROUGH MID-LATE WEEK AND THIS COULD LEAD TO SHALLOW
SALTWATER FLOODING DURING THE TIME OF THE EARLY EVENING HIGH
TIDES. THE SITUATION COULD BECOME WORSE IF HEAVY RAINFALL OCCURS
DURING THE HIGH TIDE...ESPECIALLY IN THE NORMALLY FLOOD-PRONE
AREAS SUCH AS DOWNTOWN CHARLESTON AND SAVANNAH.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...NONE.
SC...NONE.
MARINE...NONE.

&&

SYNOPSIS...
NEAR TERM...DPB
SHORT TERM...RFM
LONG TERM...RFM
AVIATION...RJB/RFM
MARINE...RJB/DPB
TIDES/COASTAL FLOODING...
Hazardous weather outlook, Aug 28, 4:16 AM EDT, 7 hours 20 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHARLESTON SC
416 AM EDT TUE AUG 28 2012

GAZ087-088-099>101-114>116-118-137-138-140-SCZ040-042>045-047-290930-
JENKINS-SCREVEN-CANDLER-BULLOCH-EFFINGHAM-TATTNALL-EVANS-
INLAND BRYAN-INLAND CHATHAM-LONG-INLAND LIBERTY-INLAND MCINTOSH-
ALLENDALE-HAMPTON-INLAND COLLETON-DORCHESTER-INLAND BERKELEY-
INLAND JASPER-
416 AM EDT TUE AUG 28 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST GEORGIA AND
SOUTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

FLOODING...HEAVY RAINFALL WILL BE POSSIBLE AS DEEP TROPICAL
MOISTURE REMAINS ACROSS THE AREA. THIS COULD LEAD TO LOCALIZED
FLOODING...ESPECIALLY ACROSS LOW-LYING AND POOR DRAINAGE
AREAS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

FLOODING...HEAVY RAINFALL WILL BE POSSIBLE AS DEEP TROPICAL
MOISTURE REMAINS ACROSS THE AREA. THIS COULD LEAD TO LOCALIZED
FLOODING...ESPECIALLY ACROSS LOW-LYING AND POOR DRAINAGE
AREAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ASSISTANCE IS NOT ANTICIPATED AT THIS TIME.

GAZ117-119-139-141-SCZ048>051-290930-
COASTAL BRYAN-COASTAL CHATHAM-COASTAL LIBERTY-COASTAL MCINTOSH-
BEAUFORT-COASTAL COLLETON-CHARLESTON-COASTAL JASPER-
416 AM EDT TUE AUG 28 2012

...MODERATE RISK FOR RIP CURRENTS IN EFFECT THROUGH THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST GEORGIA AND
SOUTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   MODERATE RISK FOR RIP CURRENTS.

FLOODING...HEAVY RAINFALL WILL BE POSSIBLE AS DEEP TROPICAL
MOISTURE REMAINS ACROSS THE AREA. THIS COULD LEAD TO LOCALIZED
FLOODING...ESPECIALLY ACROSS LOW-LYING AND POOR DRAINAGE
AREAS...AS WELL AS ALONG THE COAST DURING THE TIMES OF HIGH
TIDE...ESPECIALLY EARLY THIS EVENING.

COASTAL HAZARDS...ELEVATED TIDES DUE IN PART TO THE UPCOMING FULL
MOON COULD PRODUCE SHALLOW SALT-WATER FLOODING AROUND THE TIME OF
HIGH TIDE EARLY THIS EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

FLOODING...HEAVY RAINFALL WILL REMAIN A THREAT AT TIMES THROUGH
MID WEEK AS DEEP TROPICAL MOISTURE REMAINS OVER THE AREA. THIS
COULD LEAD TO LOCALIZED FLOODING...ESPECIALLY OF LOW- LYING AND
POORLY DRAINED AREAS AS WELL AS ALONG THE COAST DURING TIMES OF
HIGH TIDE.

COASTAL HAZARDS...THE RIP CURRENT RISK WILL REMAIN ELEVATED
THROUGH AT LEAST THE MIDDLE OF THE WEEK. ALSO...ELEVATED TIDES
WILL CONTINUE AND MAY PRODUCE SHALLOW SALT WATER FLOODING AROUND
THE TIMES OF HIGH TIDE EACH EVENING THROUGH LATE WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ASSISTANCE IS NOT ANTICIPATED AT THIS TIME.

SCZ052-290930-
TIDAL BERKELEY-
416 AM EDT TUE AUG 28 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

FLOODING...HEAVY RAINFALL WILL BE POSSIBLE AS DEEP TROPICAL
MOISTURE REMAINS ACROSS THE AREA. THIS COULD LEAD TO LOCALIZED
FLOODING...ESPECIALLY ACROSS LOW-LYING AND POOR DRAINAGE
AREAS...AS WELL AS ALONG THE COAST DURING THE TIMES OF HIGH
TIDE...ESPECIALLY EARLY THIS EVENING.

COASTAL HAZARDS...ELEVATED TIDES DUE IN PART TO THE UPCOMING FULL
MOON COULD PRODUCE SHALLOW SALT WATER FLOODING AROUND THE TIME OF
HIGH TIDE THIS EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

FLOODING...HEAVY RAINFALL WILL REMAIN A THREAT AT TIMES THROUGH
MID WEEK AS DEEP TROPICAL MOISTURE REMAINS OVER THE AREA. THIS
COULD LEAD TO LOCALIZED FLOODING...ESPECIALLY OF LOW- LYING AND
POORLY DRAINED AREAS AS WELL AS ALONG THE COAST DURING TIMES OF
HIGH TIDE.

COASTAL HAZARDS...THE RIP CURRENT RISK WILL REMAIN ELEVATED
THROUGH AT LEAST THE MIDDLE OF THE WEEK. ALSO...ELEVATED TIDES
WILL CONTINUE AND MAY PRODUCE SHALLOW SALT WATER FLOODING AROUND
THE TIMES OF HIGH TIDE EACH EVENING THROUGH LATE WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ASSISTANCE IS NOT ANTICIPATED AT THIS TIME.

AMZ330-350-352-354-374-290930-
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-
416 AM EDT TUE AUG 28 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ASSISTANCE IS NOT ANTICIPATED AT THIS TIME.

In the hours before

Special weather statement, Aug 28, 11:02 AM EDT, 34 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1102 AM EDT TUE AUG 28 2012

SCZ045-050-052-281600-
CHARLESTON-INLAND BERKELEY-TIDAL BERKELEY-
1102 AM EDT TUE AUG 28 2012

...FUNNEL CLOUDS ARE POSSIBLE IN PORTIONS OF CHARLESTON AND BERKELEY
COUNTIES THROUGH NOON EDT...

AT 1057 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
THUNDERSTORMS...ALONG A LINE EXTENDING FROM NORTH CHARLESTON TO
LEGAREVILLE TO 15 MILES SOUTH OF KIAWAH ISLAND...MOVING NORTHEAST AT
25 MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
BOONE HALL PLANTATION...CAINHOY...CAPERS INLET...CHARLES TOWNE
LANDING...CHARLESTON NAVAL COMPLEX...DANIEL ISLAND...DON HOLT
BRIDGE...DOWNTOWN CHARLESTON...FOLLY BEACH...FORT JOHNSON...FORT
SUMTER...GARRIS LANDING...ISLE OF PALMS...JAMES ISLAND...JAMES ISLAND
COUNTY PARK...KIAWAH ISLAND...MAYBANK BRIDGE...MOUNT PLEASANT...MOUNT
PLEASANT REGIONAL AIRPORT...MOUNT PLEASANT TOWNE CENTRE...NORTH
CHARLESTON...PRICE INLET...SULLIVANS ISLAND...WANDO AND WEST
ASHLEY...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
FUNNEL CLOUDS...
MINOR FLOODING OF POOR DRAINAGE AREAS...

CONDITIONS ARE FAVORABLE FOR BRIEF FUNNEL CLOUDS ALONG THE
LINE...ALONG WITH VERY HEAVY RAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
BE READY TO TAKE IMMEDIATE ACTION IN CASE A SEVERE THUNDERSTORM
WARNING IS ISSUED FOR YOUR LOCATION.

&&

LAT...LON 3303 7968 3288 7963 3284 7969 3279 7973
      3277 7981 3275 7984 3275 7986 3268 7988
      3263 7997 3260 7999 3259 8012 3288 8000
      3328 7959 3327 7958
TIME...MOT...LOC 1501Z 221DEG 21KT 3287 7997 3267 8005
          3242 7997
Local storm report, Aug 28, 11:09 AM EDT, 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1109 AM EDT TUE AUG 28 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1100 AM     HEAVY RAIN       1 ESE SHADOWMOSS        32.84N  80.05W
08/28/2012  E4.00 INCH       CHARLESTON         SC   TRAINED SPOTTER

            SPOTTER REPORTED 4 INCHES OF RAIN IN THE LAST 4 HOURS
            IN AN ELECTRONIC RAIN GAUGE.

&&

EVENT NUMBER CHS1200709

BDC

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 28, 10:59 AM EDTAreal Flood AdvisoryCHSBerkeley, Charleston2 hr
Aug 28, 11:02 AM EDTSpecial Weather StatementCHSCharleston58 min
Aug 28, 12:07 PM EDTSpecial Weather StatementCHSBerkeley53 min
Aug 28, 12:27 PM EDTAreal Flood AdvisoryCHSBerkeley, Charleston3 hr
Aug 28, 12:37 PM EDTAreal Flood AdvisoryCHSCharleston, Colleton, Dorchester3 hr
Aug 28, 3:53 PM EDTAreal Flood AdvisoryCHSJasper2 hr
Aug 28, 4:56 PM EDTSevere Thunderstorm WarningCHSHampton, Jasper64 min
Aug 28, 5:58 PM EDTSpecial Weather StatementCHSBeaufort, Colleton, Jasper47 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.