Alert archive / North Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 38, NWS Raleigh, NC

August 14, 2011Wayne County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 14, 2011, 10:57 PM EDT for Wayne County, North Carolina. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 14, 2011, 10:57 PM EDT (02:57 UTC)
Expired
Aug 15, 2011, 1:00 AM EDT
In force
2 hr
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

County Wayne County, NC

The radar

The Raleigh/Durham radar (KRAX), 56 km from the middle of the area, began a volume at 02:56 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.

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 3.0 hours before the alert went out and 120 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, Newport, NC at 00:00Z on 2011-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2375 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Newport, NC at 00:00Z on 2011-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.19395878Sfc1 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
2375 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
590 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
43 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

990 
WGUS52 KRAH 150257
FFWRAH
NCC191-150500-
/O.NEW.KRAH.FF.W.0038.110815T0257Z-110815T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
1057 PM EDT SUN AUG 14 2011

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WAYNE COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 100 AM EDT

* AT 1051 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED THUNDERSTORMS WITH VERY HEAVY RAIN APPROACHING WAYNE 
  COUNTY AND GOLDSBORO FROM THE WEST. EARLIER FLASH FLOODING HAD 
  ABATED ACCORDING TO LAW ENFORCEMENT IN GOLDSBORO...BUT SOME ROADS 
  STILL CONTAINED STANDING WATER AND WERE BARELY PASSABLE. 
  ADDITIONAL RAIN COULD RESULT IN RENEWED FLOODING ON AREA ROADS IN 
  GOLDSBORO.

* LOCATIONS THREATENED WITH FLOODING INCLUDE WALNUT CREEK AND
  GOLDSBORO.

AN ADDITIONAL INCH OR TWO OF RAIN FROM APPROACHING THUNDERSTORMS 
COULD EASILY RESULT IN ADDITIONAL FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXTREMELY DANGEROUS. NUMEROUS ROADS AND LOW LYING 
AREAS WILL QUICKLY FLOOD...ESPECIALLY IN AND IMMEDIATELY AROUND 
GOLDSBORO...WHERE DOPPLER RADAR SHOWED OVER FOUR INCHES OF RAIN 
LIKELY HAD FALLEN FROM EARLIER THUNDERSTORMS. IF YOU ARE 
EXPERIENCING FLOODING MOVE TO HIGHER GROUND. DO NOT DRIVE WHERE 
WATER COVERS THE ROAD.

PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY CALLING...
1...8 7 7...6 3 3...6 7 7 2 OR NOTIFY YOUR LOCAL LAW ENFORCEMENT
AGENCY.

&&

LAT...LON 3528 7783 3529 7815 3543 7815 3545 7814
      3547 7782

$$

DJF
1 follow-up statement
605 
WGUS72 KRAH 150451
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
1251 AM EDT MON AUG 15 2011

NCC191-150500-
/O.CON.KRAH.FF.W.0038.000000T0000Z-110815T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE NC-
1251 AM EDT MON AUG 15 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
CENTRAL WAYNE COUNTY...

AT 1248 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE HEAVY RAIN HAD MOVED EAST OF THE AREA. COUNTY OFFICIALS
HAVE REPORTED THAT FLOODING HAD ABATED. THUS THE FLASH FLOOD WARNING 
WILL BE ALLOWED TO EXPIRE AT 100 AM EDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY CALLING...
1...8 7 7...6 3 3...6 7 7 2 OR NOTIFY YOUR LOCAL LAW ENFORCEMENT
AGENCY.

&&

LAT...LON 3528 7783 3529 7815 3543 7815 3545 7814
      3547 7782

$$

23

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 14, 8:00 PM EDTSevere Thunderstorm WarningRAHDavidson, Forsyth45 min
Aug 14, 8:19 PM EDTAreal Flood AdvisoryRAHWayne3 hr
Aug 14, 8:47 PM EDTFlash Flood WarningRAHWayne3 hr
Aug 14, 8:53 PM EDTSpecial Weather StatementRAHAlamance, Randolph67 min
Aug 14, 9:05 PM EDTSevere Thunderstorm WarningRAHAlamance, Guilford40 min
Aug 14, 9:18 PM EDTSpecial Weather StatementRAHMontgomery, Stanly57 min
Aug 14, 9:32 PM EDTSpecial Weather StatementRAHLee, Moore43 min
Aug 14, 9:44 PM EDTSevere Thunderstorm WarningRAHAlamance, Chatham, Orange37 min
Aug 14, 9:54 PM EDTSpecial Weather StatementRAHDurham66 min
Aug 14, 10:04 PM EDTSevere Thunderstorm WarningRAHDurham, Franklin, Granville, Wake41 min
Aug 14, 10:05 PM EDTSpecial Weather StatementRAHJohnston55 min
Aug 14, 10:18 PM EDTSpecial Weather StatementRAHCumberland, Harnett, Hoke, Lee57 min
Aug 14, 10:35 PM EDTSevere Thunderstorm WarningRAHCumberland, Harnett, Hoke55 min
Aug 14, 10:43 PM EDTSevere Thunderstorm WarningRAHFranklin, Johnston, Nash, Wake62 min
Aug 14, 11:06 PM EDTSevere Thunderstorm WarningRAHSampson, Wayne84 min
Aug 14, 11:20 PM EDTSevere Thunderstorm WarningRAHEdgecombe, Halifax, Nash, Wilson49 min

Nearby

Flash Flood Warnings in North Carolina, 2011Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.