Alert archive / North Carolina / Flash Flood Warnings in 2012

Flash Flood Warning 22, NWS Greenville-Spartanburg, SC

August 11, 2012Cleveland County, North Carolina

NWS Greenville-Spartanburg, SC issued this flash flood warning at Aug 11, 2012, 11:10 PM EDT for Cleveland County, North Carolina. It was in force for 112 min. 1 report 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 11, 2012, 11:10 PM EDT (03:10 UTC)
Expired: Aug 12, 2012, 1:02 AM EDT
In force: 112 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Flood severity: None

County Cleveland County, NC

The radar

The Greer radar (KGSP), 76 km from the middle of the area, began a volume at 03:11 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 12, 12:00 AM EDT	FLASH FLOOD	4 Sw Shelby, NC	RIVER BEND GOLF COURSE HAD 3 INCHES OF RAIN WHICH RESULTED IN THE FAILURE OF A DAM THAT HOLDS ONE OF THE PONDS ON THE GOLF COURSE. THE WATER FLOWED INTO THE NEXT POND AT THE GOLF COURSE. NOBODY WAS AROUND WHEN THIS HAPPENED SO THE TIME IS ESTIMATED BASED ON WH

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

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.2 hours before the alert went out and 172 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: 969 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

978 
WGUS52 KGSP 120310
FFWGSP
NCC045-120600-
/O.NEW.KGSP.FF.W.0022.120812T0310Z-120812T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1110 PM EDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN CLEVELAND COUNTY IN THE PIEDMONT OF NORTH CAROLINA...

* UNTIL 200 AM EDT

* AT 1108 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
WARNED AREA. RECENT RADAR RAINFALL ESTIMATES IN EXCESS OF 2 INCHES 
HAVE OCCURRED ON THE SOUTH SIDE OF SHELBY. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...  
SHELBY...BOILING SPRINGS NC...EARL AND KINGS MOUNTAIN.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

TO REPORT HIGH WATER...FLOODING...MUDSLIDES...LANDSLIDES OR OTHER
SEVERE WEATHER THROUGH OUR AUTOMATED REPORTING SYSTEM...CALL OUR TOLL
FREE NUMBER... 1 8 7 7...6 3 3...6 7 7 2.

&&

LAT...LON 3517 8133 3516 8134 3518 8176 3520 8177
      3536 8170 3533 8138 3526 8134

$$

JPT

2 follow-up statements

208 
WGUS72 KGSP 120427
FFSGSP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1227 AM EDT SUN AUG 12 2012

NCC045-120600-
/O.CON.KGSP.FF.W.0022.000000T0000Z-120812T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLEVELAND NC-
1227 AM EDT SUN AUG 12 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN CLEVELAND
COUNTY UNTIL 200 AM EDT...

RUNOFF FROM EXCESSIVE RAINFALL MAY CAUSE FLASH FLOODING TO OCCUR. 
SOME LOCATIONS THAT MAY EXPERIENCE FLASH FLOODING 
INCLUDE...SHELBY...BOILING SPRINGS NC...EARL AND KINGS MOUNTAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM MAY CAUSE MINOR FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3517 8133 3516 8134 3518 8176 3520 8177
      3536 8170 3533 8138 3526 8134

$$

JPT

635 
WGUS72 KGSP 120502
FFSGSP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
102 AM EDT SUN AUG 12 2012

NCC045-120517-
/O.CAN.KGSP.FF.W.0022.000000T0000Z-120812T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLEVELAND NC-
102 AM EDT SUN AUG 12 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN CLEVELAND
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3517 8133 3516 8134 3518 8176 3520 8177
      3536 8170 3533 8138 3526 8134

$$

JPT

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 8:45 PM EDT	Special Weather Statement	GSP	Lincoln	45 min
Aug 11, 8:57 PM EDT	Areal Flood Advisory	GSP	Lincoln	2 hr
Aug 11, 10:51 PM EDT	Areal Flood Advisory	GSP	Cleveland	2 hr

Nearby

Flash Flood Warnings in North Carolina, 2012 Every 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.