Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 21, NWS Charleston, SC

July 12, 2013Chatham County, Georgia

NWS Charleston, SC issued this flash flood warning at Jul 12, 2013, 9:25 PM EDT for Chatham County, Georgia. It was in force for 2 hr. 2 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: Jul 12, 2013, 9:25 PM EDT (01:25 UTC)
Expired: Jul 12, 2013, 11:30 PM EDT
In force: 2 hr
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Flood severity: None

County Chatham County, GA

The radar

The Charleston,SC radar (KCLX), 77 km from the middle of the area, began a volume at 01:26 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
Jul 12, 10:10 PM EDT	FLASH FLOOD	Windsor Forest, GA	WHITE BLUFF ROAD BETWEEN WINDSOR RD AND WILLOW RD IS CLOSED DUE TO FLOODING.
Jul 12, 10:27 PM EDT	HEAVY RAIN 4.72	Tybee Island, GA

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 00:00Z, 1.4 hours before the alert went out and 140 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 837 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 609 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 6 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.

992 
WGUS52 KCHS 130125
FFWCHS
GAC051-130330-
/O.NEW.KCHS.FF.W.0021.130713T0125Z-130713T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
925 PM EDT FRI JUL 12 2013

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL CHATHAM COUNTY IN SOUTHEAST GEORGIA...

* UNTIL 1130 PM EDT

* AT 921 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH TORRENTIAL RAINS EXTENDING FROM TYBEE ISLAND
  TO SKIDAWAY ISLAND. THESE STORMS ARE NEARLY STATIONARY. 

  BETWEEN 2 AND 4 INCHES OF RAIN HAS FALLEN OVER SKIDAWAY ISLAND
  UP THROUGH WILMINGTON ISLAND AND TYBEE ISLAND OVER THE PAST FEW
  HOURS. AN ADDITIONAL 2 TO 3 INCHES WILL BE POSSIBLE THROUGH
  1130 PM...RESULTING IN FLASH FLOODING.

* FLASH FLOODING IS EXPECTED IN AND AROUND...
  SKIDAWAY ISLAND...WASSAW ISLAND...ISLE OF HOPE...MONTGOMERY...

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 3190 8117 3189 8121 3189 8122 3203 8116
      3198 8102 3207 8097 3204 8092 3204 8088
      3202 8088 3203 8085 3202 8084 3200 8084
      3197 8085 3194 8091 3190 8094 3188 8097
      3188 8116

$$

2 follow-up statements

077 
WGUS72 KCHS 130221
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1021 PM EDT FRI JUL 12 2013

GAC051-130330-
/O.CON.KCHS.FF.W.0021.000000T0000Z-130713T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHATHAM GA-
1021 PM EDT FRI JUL 12 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT FOR
CENTRAL CHATHAM COUNTY...

AT 1021 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE HEAVY RAIN CAPABLE OF PRODUCING FLASH FLOODING OVER THE 
WARNED AREA. THE HEAVIEST RAINS EXTENDED FROM TYBEE ISLAND
THROUGH SKIDAWAY ISLAND TO JUST SOUTH OF MONTGOMERY. RADAR ESTIMATES 
BETWEEN 3 AND 6 INCHES OF RAIN HAS FALLEN ACROSS THE WARNED AREA 
OVER THE PAST FEW HOURS. ANOTHER 1 TO 2 INCHES OF RAIN IS POSSIBLE 
THROUGH 1130 PM. 

FLASH FLOODING IS EXPECTED IN AND AROUND ISLE OF HOPE...SANDFLY...
SKIDAWAY ISLAND...TYBEE ISLAND...VERNONBURG...WHITE BLUFF...
WILMINGTON ISLAND...WINDSOR FOREST...FORT PULASKI NATIONAL
MONUMENT...MONTGOMERY AND WASSAW ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU CAN NOT SEE THE ROAD DUE TO INTENSE NIGHT RAINFALL...YOU
SHOULD NOT DRIVE.

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 3190 8117 3189 8121 3189 8122 3203 8116
      3198 8102 3207 8097 3204 8092 3204 8088
      3202 8088 3203 8085 3202 8084 3200 8084
      3197 8085 3194 8091 3190 8094 3188 8097
      3188 8116

$$

659 
WGUS72 KCHS 130322
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1122 PM EDT FRI JUL 12 2013

GAC051-130332-
/O.EXP.KCHS.FF.W.0021.000000T0000Z-130713T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHATHAM GA-
1122 PM EDT FRI JUL 12 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1130 PM EDT FOR FOR CENTRAL
CHATHAM COUNTY...

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 3190 8117 3189 8121 3189 8122 3203 8116
      3198 8102 3207 8097 3204 8092 3204 8088
      3202 8088 3203 8085 3202 8084 3200 8084
      3197 8085 3194 8091 3190 8094 3188 8097
      3188 8116

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 12:11 PM EDT	Areal Flood Advisory	CHS	Bulloch, Candler	64 min
Jul 13, 12:39 PM EDT	Areal Flood Advisory	CHS	Liberty	51 min
Jul 13, 2:23 PM EDT	Flash Flood Warning	CHS	Screven	112 min
Jul 13, 2:36 PM EDT	Flash Flood Warning	CHS	Chatham, Effingham	114 min
Jul 13, 3:43 PM EDT	Special Weather Statement	CHS	Screven	32 min
Jul 13, 3:55 PM EDT	Areal Flood Advisory	CHS	Liberty, Long, McIntosh	2 hr
Jul 13, 4:19 PM EDT	Flash Flood Warning	CHS	Bulloch, Screven	6 hr
Jul 13, 4:28 PM EDT	Flash Flood Warning	CHS	Chatham, Effingham	2 hr

Nearby

Flash Flood Warnings in Georgia, 2013 Every flash flood warning in 2013

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.