Alert archive / North Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 33, NWS Raleigh, NC

August 12, 2011Richmond County, Scotland County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 12, 2011, 5:36 PM EDT for Richmond County, Scotland County, North Carolina. It was in force for 85 min. 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 12, 2011, 5:36 PM EDT (21:36 UTC)
Expired
Aug 12, 2011, 7:01 PM EDT
In force
85 min
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

Counties Richmond County, NC, Scotland County, NC

The radar

The Raleigh/Durham radar (KRAX), 141 km from the middle of the area, began a volume at 21:38 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.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.6 hours before the alert went out and 137 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, Greensboro/Hi Pt, NC at 12:00Z on 2011-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 185 joules per kilogram.LCLLFCEL10008507005003002001001 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, Greensboro/Hi Pt, NC at 12:00Z on 2011-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.1939587897Sfc1 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
185 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
1130 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

346 
WGUS52 KRAH 122136
FFWRAH
NCC153-165-130030-
/O.NEW.KRAH.FF.W.0033.110812T2136Z-110813T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
536 PM EDT FRI AUG 12 2011

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  RICHMOND COUNTY IN CENTRAL NORTH CAROLINA
  SCOTLAND COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 830 PM EDT

* AT 528 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAIN PRODUCING FLOODING OVER SCOTLAND
  AND SOUTHERN RICHMOND COUNTIES. DOPPLER RADAR ESTIMATED THAT   AS 
MUCH AS TWO TO THREE INCHES OF RAIN HAS FALLEN OVER PORTIONS OF 
SOUTHERN SOUTHERN SCOTLAND AND SOUTHERN RICHMOND COUNTIES

* LOCATIONS THREATENED WITH FLOODING INCLUDE ROCKINGHAM... 
LAURINBURG... LAUREL HILL... AND HAMLET.

AN ADDITIONAL ONE TO THREE INCHES OF RAINFALL ARE STILL POSSIBLE 
RESULTING IN ADDITIONAL FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THE HEAVY RAIN WILL CAUSE FLASH FLOODING OF
CREEKS AND STREAMS...ROADS...LOW LYING AND POOR DRAINAGE AREAS. DO
NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. MANY
ROADS AND INTERSECTIONS IN THE AREA WILL QUICKLY FLOOD. WHEN
ENCOUNTERING FLOODED ROADS TURN AROUND...DONT DROWN.

NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
AS LITTLE AS 6 INCHES OF WATER CAN CAUSE YOU TO LOSE CONTROL OF YOUR
VEHICLE. TWO FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES
INCLUDING SPORT UTILITY VEHICLES AND PICKUP TRUCKS. TURN AROUND...
DONT DROWN.

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 3480 7968 3480 7992 3485 7990 3490 7985
      3495 7987 3498 7987 3501 7990 3502 7989
      3487 7934 3482 7935 3477 7933 3463 7946

$$
1 follow-up statement
658 
WGUS72 KRAH 122301
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
701 PM EDT FRI AUG 12 2011

NCC153-165-122310-
/O.CAN.KRAH.FF.W.0033.000000T0000Z-110813T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RICHMOND NC-SCOTLAND NC-
701 PM EDT FRI AUG 12 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SCOTLAND AND
SOUTHERN RICHMOND COUNTIES...

THE STORMS THAT PROMPTED THE FLASH FLOOD WARNING FOR SCOTLAND AND 
RICHMOND COUNTIES HAVE WEAKENED AND MOVED OUT OF THE WARNING AREA. 
THEREFORE THE FLASH FLOOD WARNING HAS BEEN CANCELLED. 

LAT...LON 3480 7968 3480 7992 3485 7990 3490 7985
      3495 7987 3498 7987 3501 7990 3502 7989
      3487 7934 3482 7935 3477 7933 3463 7946

$$

23

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 9:23 AM EDTSpecial Weather StatementRAHNash67 min
Aug 12, 10:08 AM EDTSpecial Weather StatementRAHFranklin, Nash52 min
Aug 12, 10:43 AM EDTSevere Thunderstorm WarningRAHFranklin47 min
Aug 12, 10:57 AM EDTAreal Flood AdvisoryRAHFranklin, Nash, Wake93 min
Aug 12, 11:09 AM EDTSpecial Weather StatementRAHWayne36 min
Aug 12, 11:22 AM EDTSevere Thunderstorm WarningRAHJohnston, Wayne53 min
Aug 12, 11:40 AM EDTSpecial Weather StatementRAHWilson50 min
Aug 12, 11:52 AM EDTSpecial Weather StatementRAHFranklin53 min
Aug 12, 11:53 AM EDTAreal Flood AdvisoryRAHJohnston, Wayne2 hr
Aug 12, 12:21 PM EDTSpecial Weather StatementRAHWilson39 min
Aug 12, 12:31 PM EDTSevere Thunderstorm WarningRAHWilson44 min
Aug 12, 12:38 PM EDTFlash Flood WarningRAHJohnston, Wayne85 min
Aug 12, 12:53 PM EDTSpecial Weather StatementRAHWayne22 min
Aug 12, 12:58 PM EDTSevere Thunderstorm WarningRAHWayne31 min
Aug 12, 1:39 PM EDTSpecial Weather StatementRAHHarnett66 min
Aug 12, 3:10 PM EDTSpecial Weather StatementRAHChatham50 min
Aug 12, 3:31 PM EDTSpecial Weather StatementRAHChatham, Lee, Moore59 min
Aug 12, 3:49 PM EDTAreal Flood AdvisoryRAHAnson, Stanly110 min
Aug 12, 4:02 PM EDTFlash Flood WarningRAHAnson, Stanly87 min
Aug 12, 4:31 PM EDTSpecial Weather StatementRAHStanly59 min
Aug 12, 4:36 PM EDTSpecial Weather StatementRAHOrange39 min
Aug 12, 4:44 PM EDTSpecial Weather StatementRAHRandolph61 min
Aug 12, 4:57 PM EDTSpecial Weather StatementRAHScotland63 min
Aug 12, 4:58 PM EDTAreal Flood AdvisoryRAHAlamance, Chatham, Orange, Randolph108 min
Aug 12, 5:06 PM EDTAreal Flood AdvisoryRAHScotland2 hr
Aug 12, 5:19 PM EDTSpecial Weather StatementRAHOrange56 min
Aug 12, 5:23 PM EDTSpecial Weather StatementRAHAlamance52 min
Aug 12, 5:45 PM EDTSpecial Weather StatementRAHAlamance60 min
Aug 12, 5:55 PM EDTAreal Flood AdvisoryRAHGuilford24 min
Aug 12, 6:16 PM EDTFlash Flood WarningRAHGuilford71 min
Aug 12, 6:31 PM EDTSpecial Weather StatementRAHPerson59 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.