Alert archive / North Carolina / Flash Flood Warnings in 2012

Flash Flood Warning 30, NWS Raleigh, NC

August 19, 2012Durham County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 19, 2012, 8:03 AM EDT for Durham County, North Carolina. It was in force for 50 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 19, 2012, 8:03 AM EDT (12:03 UTC)
Expired
Aug 19, 2012, 8:53 AM EDT
In force
50 min
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

County Durham County, NC

The radar

The Raleigh/Durham radar (KRAX), 48 km from the middle of the area, began a volume at 12:06 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, 0.1 hours before the alert went out and 100 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 2012-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 303 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 2012-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
303 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
598 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
72 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.

186 
WGUS52 KRAH 191203
FFWRAH
NCC063-191330-
/O.NEW.KRAH.FF.W.0030.120819T1203Z-120819T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
803 AM EDT SUN AUG 19 2012

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 930 AM EDT

* AT 758 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS PRODUCING FLOODING OVER EASTERN DURHAM 
  COUNTY. DOPPLER RADAR ESTIMATED THAT OVER 1.5 INCHES OF RAIN HAS 
  FALLEN OVER THE CITY OF DURHAM SINCE 630 AM.

* LOCATIONS THREATENED WITH FLOODING INCLUDE PARKWOOD...GORMAN AND
  BETHESDA.

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 3609 7881 3607 7879 3607 7875 3603 7875
      3602 7874 3603 7871 3598 7871 3592 7876
      3593 7880 3589 7882 3586 7888 3587 7894
      3624 7886 3624 7880

$$

WSS
1 follow-up statement
342 
WGUS72 KRAH 191253
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
853 AM EDT SUN AUG 19 2012

NCC063-191300-
/O.CAN.KRAH.FF.W.0030.000000T0000Z-120819T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DURHAM NC-
853 AM EDT SUN AUG 19 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN DURHAM
COUNTY...

AT 845 AM EDT...THE HEAVY RAINFALL HAS ENDED ACROSS DURHAM COUNTY 
AND COUNTY OFFICIALS REPORT NO PROBLEMS DUE TO HIGH WATER AT THIS 
TIME. THUS...THE FLASH FLOOD WARNING HAS BEEN CANCELLED. 
HOWEVER...ANOTHER BATCH OF SHOWERS AND THUNDERSTORMS WITH HEAVY 
RAINFALL MAY AFFECT THE DURHAM LATER THIS MORNING OR EARLY THIS 
AFTERNOON. DUE TO THE RECENT HEAVY RAINFALL...CREEKS AND STREAMS 
WILL LIKELY RESPOND QUICKLY...POSSIBLY LEADING TO MINOR FLOODING.

LAT...LON 3609 7881 3607 7879 3607 7875 3603 7875
      3602 7874 3603 7871 3598 7871 3592 7876
      3593 7880 3589 7882 3586 7888 3587 7894
      3624 7886 3624 7880

$$

WSS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:34 PM EDTSpecial Weather StatementRAHWayne11 min
Aug 19, 4:26 AM EDTSpecial Weather StatementRAHAlamance, Chatham, Durham, Franklin, Granville, Guilford and 6 more2 hr
Aug 19, 4:49 AM EDTAreal Flood AdvisoryRAHAlamance, Guilford, Orange, Randolph3 hr
Aug 19, 6:04 AM EDTSpecial Weather StatementRAHAlamance, Chatham, Durham, Franklin, Granville, Guilford and 6 more116 min
Aug 19, 6:58 AM EDTSpecial Weather StatementRAHChatham, Durham, Franklin, Granville, Orange, Person and 2 more92 min
Aug 19, 7:37 AM EDTAreal Flood AdvisoryRAHGuilford4 hr
Aug 19, 7:40 AM EDTSpecial Weather StatementRAHAnson, Montgomery, Richmond, Stanly65 min
Aug 19, 8:24 AM EDTSpecial Weather StatementRAHFranklin, Nash, Vance, Warren51 min
Aug 19, 8:47 AM EDTSpecial Weather StatementRAHAnson, Richmond, Scotland58 min
Aug 19, 8:55 AM EDTSevere Thunderstorm WarningRAHFranklin, Halifax, Nash, Warren65 min
Aug 19, 9:05 AM EDTSevere Thunderstorm WarningRAHHalifax, Warren40 min
Aug 19, 9:09 AM EDTTornado WarningRAHHalifax23 min
Aug 19, 9:20 AM EDTAreal Flood AdvisoryRAHHalifax, Vance, Warren3 hr
Aug 19, 9:25 AM EDTSpecial Weather StatementRAHMontgomery, Moore65 min
Aug 19, 9:41 AM EDTFlash Flood WarningRAHHalifax, Warren2 hr
Aug 19, 9:47 AM EDTSpecial Weather StatementRAHHoke, Richmond, Scotland58 min
Aug 19, 9:47 AM EDTSevere Thunderstorm WarningRAHEdgecombe, Halifax, Nash58 min
Aug 19, 10:28 AM EDTSpecial Weather StatementRAHCumberland, Harnett, Hoke, Lee, Moore62 min
Aug 19, 11:22 AM EDTFlash Flood WarningRAHHalifax, Warren2 hr
Aug 19, 11:26 AM EDTSpecial Weather StatementRAHCumberland, Harnett, Sampson64 min
Aug 19, 11:35 AM EDTAreal Flood AdvisoryRAHWake78 min
Aug 19, 12:26 PM EDTSpecial Weather StatementRAHSampson, Wayne64 min
Aug 19, 7:14 PM EDTSpecial Weather StatementRAHSampson46 min

Nearby

Flash Flood Warnings in North Carolina, 2012Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.