Alert archive / North Carolina / Flash Flood Warnings in 2012

Flash Flood Warning 19, NWS Raleigh, NC

July 11, 2012Davidson County, Randolph County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Jul 11, 2012, 3:39 AM EDT for Davidson County, Randolph County, North Carolina. It was in force for 3 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: Jul 11, 2012, 3:39 AM EDT (07:39 UTC)
Expired: Jul 11, 2012, 6:30 AM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

Counties Davidson County, NC, Randolph County, NC

The radar

The Roanoke radar (KFCX), 133 km from the middle of the area, began a volume at 07:42 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 7.7 hours before the alert went out and 42 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: 112 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1189 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

692 
WGUS52 KRAH 110739
FFWRAH
NCC057-151-111030-
/O.NEW.KRAH.FF.W.0019.120711T0739Z-120711T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
339 AM EDT WED JUL 11 2012

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DAVIDSON COUNTY IN CENTRAL NORTH CAROLINA
  RANDOLPH COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 630 AM EDT

* AT 332 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN PRODUCING FLOODING OVER RANDOLPH AND DAVIDSON   
COUNTIES. DOPPLER RADAR ESTIMATED THAT AS MUCH AS THREE INCHES OF 
RAIN HAS FALLEN OVER NORTHERN RANDOLPH COUNTY.  ADDITIONAL HEAVY 
RAIN IS MOVING INTO THE SOUTHERN HALF OF DAVIDSON AND RANDOLPH 
COUNTIES...AND AN ADDITIONAL TWO TO THREE INCHES OF RAIN WILL BE 
POSSIBLE.

* LOCATIONS THREATENED WITH FLOODING INCLUDE THOMASVILLE...
  LEXINGTON...SEAGROVE...RANDLEMAN...ASHEBORO AND LINWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3584 8047 3583 8046 3586 8042 3585 8039
      3588 8042 3589 8037 3597 8040 3599 8024
      3603 8020 3603 8013 3601 8004 3592 8004
      3590 7955 3552 7956 3550 8018 3558 8021
      3568 8034 3571 8033 3574 8046 3584 8048

$$

22

2 follow-up statements

092 
WGUS72 KRAH 110840
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
440 AM EDT WED JUL 11 2012

NCC057-151-111030-
/O.CON.KRAH.FF.W.0019.000000T0000Z-120711T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAVIDSON NC-RANDOLPH NC-
440 AM EDT WED JUL 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM EDT FOR
RANDOLPH AND DAVIDSON COUNTIES...

AT 432 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE SLOW MOVING THUNDERSTORMS PRODUCING FLOODING OVER RANDOLPH 
AND DAVIDSON COUNTIES. DOPPLER RADAR ESTIMATED THAT THREE TO FOUR 
INCHES OF RAIN HAS FALLEN OVER SOUTHERN RANDOLPH AND SOUTHERN 
DAVIDSON COUNTIES.  

WHILE RAINFALL RATES HAVE DECREASED OVER THE PAST 30 
MINUTES...ADDITIONAL HEAVY RAIN IS APPROACHING FROM THE SOUTHWEST.  
FLASH FLOODING WILL BE MOST LIKELY IN AREAS FROM DENTON TO 
MARTHA...ULAH AND SEAGROVE.

LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO
THOMASVILLE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3584 8047 3583 8046 3586 8042 3585 8039
      3588 8042 3589 8037 3597 8040 3599 8024
      3603 8020 3603 8013 3601 8004 3592 8004
      3590 7955 3552 7956 3550 8018 3558 8021
      3568 8034 3571 8033 3574 8046 3584 8048

$$

22

528 
WGUS72 KRAH 111028
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
628 AM EDT WED JUL 11 2012

NCC057-151-111033-
/O.EXP.KRAH.FF.W.0019.000000T0000Z-120711T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAVIDSON NC-RANDOLPH NC-
628 AM EDT WED JUL 11 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 AM EDT FOR RANDOLPH AND
DAVIDSON COUNTIES...

RAINFALL RATES HAVE DECREASED SIGNIFICANTLY ACROSS RANDOLPH AND 
DAVIDSON COUNTIES. NO FLASH FLOODING HAS BEEN REPORTED...AND THE 
FLASH FLOODING THREAT HAS ENDED.

LAT...LON 3584 8047 3583 8046 3586 8042 3585 8039
      3588 8042 3589 8037 3597 8040 3599 8024
      3603 8020 3603 8013 3601 8004 3592 8004
      3590 7955 3552 7956 3550 8018 3558 8021
      3568 8034 3571 8033 3574 8046 3584 8048

$$

22

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 12:08 AM EDT	Areal Flood Advisory	RAH	Alamance, Guilford	3 hr
Jul 11, 1:55 AM EDT	Special Weather Statement	RAH	Davidson, Randolph	80 min
Jul 11, 3:01 AM EDT	Special Weather Statement	RAH	Chatham, Davidson, Randolph	89 min
Jul 11, 2:09 PM EDT	Special Weather Statement	RAH	Alamance, Durham, Forsyth, Guilford, Johnston, Orange and 2 more	51 min
Jul 11, 3:17 PM EDT	Areal Flood Advisory	RAH	Edgecombe, Wilson	61 min
Jul 11, 3:25 PM EDT	Special Weather Statement	RAH	Alamance, Durham, Franklin, Johnston, Orange, Wake	50 min
Jul 11, 4:27 PM EDT	Special Weather Statement	RAH	Sampson	63 min
Jul 11, 5:27 PM EDT	Special Weather Statement	RAH	Hoke, Scotland	63 min
Jul 11, 6:01 PM EDT	Tornado Warning	RAH	Scotland	18 min
Jul 11, 6:28 PM EDT	Special Weather Statement	RAH	Anson, Richmond, Scotland	62 min
Jul 11, 7:05 PM EDT	Special Weather Statement	RAH	Bladen	55 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.