Alert archive / North Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 31, NWS Raleigh, NC

August 12, 2011Johnston County, Wayne County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 12, 2011, 12:38 PM EDT for Johnston County, Wayne 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, 12:38 PM EDT (16:38 UTC)
Expired
Aug 12, 2011, 2:03 PM EDT
In force
85 min
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

Counties Johnston County, NC, Wayne County, NC

The radar

The Raleigh/Durham radar (KRAX), 49 km from the middle of the area, began a volume at 16:42 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 12:00Z, 4.6 hours before the alert went out and 135 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 12:00Z on 2011-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 795 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, Newport, NC at 12:00Z on 2011-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 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
795 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
1042 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
53 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

162 
WGUS52 KRAH 121638
FFWRAH
NCC101-191-121900-
/O.NEW.KRAH.FF.W.0031.110812T1638Z-110812T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
1238 PM EDT FRI AUG 12 2011

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 300 PM EDT

* AT 1233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED THUNDERSTORMS WITH VERY HEAVY RAIN LIKELY PRODUCING 
  FLOODING OVER PARTS OF SOUTHWEST WAYNE AND SOUTHEAST JOHNSTON 
  COUNTIES. DOPPLER RADAR ESTIMATED THAT OVER SIX INCHES OF RAIN 
  LIKELY HAD FALLEN FROM THUNDERSTORMS IN A SMALL AREA ALONG THE 
  WAYNE AND JOHNSTON COUNTY BORDER...JUST NORTH OF HIGHWAY 13.

* LOCATIONS THREATENED WITH FLOODING INCLUDE MOUNT OLIVE.

AN ADDITIONAL ONE TO TWO INCHES OF RAIN IS POSSIBLE IN SOME AREAS. 
THIS WILL RESULT IN A CONTINUED FLOODING THREAT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3518 7806 3525 7827 3529 7831 3527 7835
      3526 7843 3540 7844 3538 7798

$$

DJF
2 follow-up statements
617 
WGUS72 KRAH 121714
FFSRAH

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

NCC101-191-121900-
/O.CON.KRAH.FF.W.0031.000000T0000Z-110812T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JOHNSTON NC-WAYNE NC-
114 PM EDT FRI AUG 12 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 PM EDT FOR
SOUTHWESTERN WAYNE AND SOUTHEASTERN JOHNSTON COUNTIES...

AT 107 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE ISOLATED THUNDERSTORMS WITH VERY HEAVY RAIN OVER PARTS OF 
SOUTHWEST WAYNE AND SOUTHEAST JOHNSTON COUNTIES. DOPPLER RADAR 
ESTIMATED THAT NEARLY SEVEN INCHES OF RAIN LIKELY HAD FALLEN IN A 
SMALL AREA ALONG THE WAYNE AND JOHNSTON COUNTY BORDER...NORTH OF 
HIGHWAY 13. THIS AREA WAS ALSO ABOUT FIVE MILES WEST OF MAR-MAC.

ISOLATED THUNDERSTORMS COULD PRODUCE AN ADDITIONAL INCH OF RAIN...
MAINTAINING THE CONCERN FOR FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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 3518 7806 3525 7827 3529 7831 3527 7835
      3526 7843 3540 7844 3538 7798

$$

DJF
076 
WGUS72 KRAH 121803
FFSRAH

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

NCC101-191-121810-
/O.CAN.KRAH.FF.W.0031.000000T0000Z-110812T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JOHNSTON NC-WAYNE NC-
203 PM EDT FRI AUG 12 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN WAYNE
AND SOUTHEASTERN JOHNSTON COUNTIES...

AT 200 PM EDT...SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN HAD 
DIMINISHED OVER SOUTHWEST WAYNE AND SOUTHEAST JOHNSTON COUNTIES. LAW 
ENFORCEMENT FROM BOTH WAYNE AND JOHNSTON COUNTIES REPORTED NO 
PROBLEMS FROM STANDING WATER. EARLIER...WITH THUNDERSTORMS...THERE 
WAS PONDING OF WATER ON ROADS IN MOUNT OLIVE...BUT NO FLASH FLOOD 
THREAT. AS A RESULT...THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

STILL...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED THAT AROUND 
SEVEN INCHES OF RAIN LIKELY FELL IN A SMALL AREA NEAR THE WAYNE AND 
JOHNSTON COUNTY BORDER...NORTH OF HIGHWAY 13 AND WEST OF MAR-MAC. 
WHEN TRAVELLING THIS AFTERNOON IN THE AREA...USE CAUTION. BE SURE TO 
AVOID ANY AREA WHERE WATER COVERS A ROADWAY. SMALL STREAMS AND 
CREEKS MAY BE SWOLLEN...AND ALSO BE SURE TO STAY AWAY FROM ANY WATER 
RUNNING HIGH AND FLOWING FAST.

STAY TUNED TO THIS STATION FOR THE LATEST WEATHER INFORMATION.

LAT...LON 3518 7806 3525 7827 3529 7831 3527 7835
      3526 7843 3540 7844 3538 7798

$$

DJF

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, 12:53 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, 5:36 PM EDTFlash Flood WarningRAHRichmond, Scotland85 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.