Alert archive / North Carolina / Flash Flood Warnings in 2012

Flash Flood Warning 36, NWS Raleigh, NC

August 25, 2012Halifax County, Nash County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 25, 2012, 6:26 AM EDT for Halifax County, Nash County, North Carolina. It was in force for 3 hr. 5 reports 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 25, 2012, 6:26 AM EDT (10:26 UTC)
Expired: Aug 25, 2012, 9:30 AM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

Counties Halifax County, NC, Nash County, NC

The radar

The Raleigh/Durham radar (KRAX), 95 km from the middle of the area, began a volume at 10:26 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 25, 7:30 AM EDT	HEAVY RAIN 6.94	2 Nw Rosemary, NC	HEAVY RAIN NEAR ROANOKE RAPIDS. OBSERVERS BASEMENT FLOODED WITH SEVERAL INCHES OF WATER.
Aug 25, 7:45 AM EDT	FLASH FLOOD	6 Sw Rosemary, NC	RESIDENCE FLOODED ON WRIGHT ROAD NEAR ROUTE 48.
Aug 25, 7:45 AM EDT	FLASH FLOOD	Roanoke Rapids, NC	AN ESTIMATED 20 OR MORE RESIDENCES AND BUILDSNIG FLOODED IN THE AREA. SWIFT WATER EVACUATIONS ARE UNDERWAY.
Aug 25, 7:45 AM EDT	FLASH FLOOD	Scotland Neck, NC	EAST 7TH STREET AND PARK AVENUE IN SCOTLAND NECK FLOODED.
Aug 25, 8:40 AM EDT	HEAVY RAIN 11.5	2 Nnw Roanoke Rapids, NC	11.50 INCHES OF RAIN REPORTED AT RAPN7.

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

The nearest sounding before it

Newport, NC (KMHX), launched 00:00Z, 10.4 hours before the alert went out and 164 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: 952 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 483 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

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

316 
WGUS52 KRAH 251026
FFWRAH
NCC083-127-251330-
/O.NEW.KRAH.FF.W.0036.120825T1026Z-120825T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
626 AM EDT SAT AUG 25 2012

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HALIFAX COUNTY IN CENTRAL NORTH CAROLINA
  NASH COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 930 AM EDT

* AT 621 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN PRODUCING FLOODING OVER NASH AND HALIFAX 
COUNTIES.   DOPPLER RADAR ESTIMATED THAT AROUND 3 TO 3.5 INCHES
OF RAIN HAS FALLEN OVER THE PAST SEVERAL HOURS. 

* LOCATIONS THREATENED WITH FLOODING INCLUDE ROANOKE   
RAPIDS...WELDON...HALIFAX...NASHVILLE...AND SPRING HOPE.

AN ADDITIONAL 1 TO 2 INCHES OF RAINFALL ARE STILL POSSIBLE RESULTING 
IN ADDITIONAL FLOODING.

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 3608 7731 3600 7740 3604 7752 3610 7754
      3615 7770 3587 7783 3574 7816 3575 7824
      3585 7822 3630 7794 3651 7787 3649 7764
      3641 7754 3632 7757 3633 7744 3624 7737
      3622 7738 3616 7726 3611 7725 3610 7725

$$

23

1 follow-up statement

999 
WGUS72 KRAH 251139
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
739 AM EDT SAT AUG 25 2012

NCC127-251141-
/O.CAN.KRAH.FF.W.0036.000000T0000Z-120825T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NASH NC-
739 AM EDT SAT AUG 25 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NASH COUNTY...

THE HEAVY RAIN HAS MOVED OUT OF THE AREA...THEREFORE THE FLOODING 
THREAT HAS ENDED.

LAT...LON 3600 7740 3604 7752 3610 7754 3615 7768
      3613 7772 3616 7774 3615 7789 3619 7797
      3618 7798 3620 7800 3651 7787 3649 7764
      3641 7754 3632 7757 3633 7744 3624 7737
      3622 7738 3616 7726 3610 7725

$$

NCC083-251330-
/O.CON.KRAH.FF.W.0036.000000T0000Z-120825T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HALIFAX NC-
739 AM EDT SAT AUG 25 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 AM EDT FOR
HALIFAX COUNTY...

AT 730 AM EDT...WEATHER SPOTTERS REPORTED VERY HEAVY RAIN AND 
FLOODING OVER HALIFAX COUNTY. A RAINFALL REPORT OF 6.94 INCHES WAS 
RECEIVED IN ROANOKE RAPIDS AND DOPPLER RADAR ESTIMATED THAT 5 TO 7 
INCHES OF RAIN HAS FALLEN OVER MUCH OF NORTHERN HALIFAX COUNTY. 

MANY ROADS ARE FLOODED IN AND AROUND DOWNTOWN ROANOKE RAPIDS...WITH 
NUMEROUS REPORTS OF STALLED CARS. 

AN ADDITIONAL INCH OF RAINFALL IS STILL POSSIBLE RESULTING IN 
ADDITIONAL FLOODING.

LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO
ROANOKE RAPIDS AND HALIFAX

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.

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 3600 7740 3604 7752 3610 7754 3615 7768
      3613 7772 3616 7774 3615 7789 3619 7797
      3618 7798 3620 7800 3651 7787 3649 7764
      3641 7754 3632 7757 3633 7744 3624 7737
      3622 7738 3616 7726 3610 7725

$$

KRR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 5:17 AM EDT	Areal Flood Advisory	RAH	Edgecombe, Franklin, Halifax, Nash, Wake, Wilson	3 hr
Aug 25, 7:04 AM EDT	Areal Flood Advisory	RAH	Warren	116 min
Aug 25, 9:30 AM EDT	Flash Flood Warning	RAH	Halifax	3 hr
Aug 25, 9:36 AM EDT	River Flood Warning	RAH	Halifax	5 hr
Aug 25, 11:58 AM EDT	Areal Flood Warning	RAH	Halifax	4 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.