Alert archive / North Carolina / Flash Flood Warnings in 2012

Flash Flood Warning 18, NWS Blacksburg, VA

May 14, 2012Yadkin County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at May 14, 2012, 7:04 PM EDT for Yadkin County, North Carolina. It was in force for 6 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
May 14, 2012, 7:04 PM EDT (23:04 UTC)
Expired
May 15, 2012, 1:00 AM EDT
In force
6 hr
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon
Flood severity
None

County Yadkin County, NC

The radar

The Roanoke radar (KFCX), 107 km from the middle of the area, began a volume at 23:05 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, 11.1 hours before the alert went out and 66 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 2012-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 26 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 2012-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.193958Sfc1 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
26 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
713 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
160 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.

000
WGUS51 KRNK 142304
FFWRNK
NCC197-150500-
/O.NEW.KRNK.FF.W.0018.120514T2304Z-120515T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
704 PM EDT MON MAY 14 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL YADKIN COUNTY IN NORTHWEST NORTH CAROLINA

* UNTIL 100 AM EDT.

* AT 700 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO YADKINVILLE
  AND SHACKTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

PLEASE RELAY ANY REPORTS OF FLOODING INCLUDING MUDSLIDES...OR ROAD
CLOSURES TO THE NATIONAL WEATHER SERVICE IN BLACKSBURG BY CALLING
TOLL FREE...1...8 6 6...2 1 5...4 3 2 4. DELAYED REPORTS ARE WELCOME.

&&

LAT...LON 3613 8074 3616 8060 3612 8052 3609 8052
      3608 8057 3605 8061 3605 8074

$$

DS
1 follow-up statement
822 
WGUS71 KRNK 150022
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
822 PM EDT MON MAY 14 2012

NCC197-150500-
/O.CON.KRNK.FF.W.0018.000000T0000Z-120515T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
YADKIN NC-
822 PM EDT MON MAY 14 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 100 AM EDT FOR
SOUTHERN YADKIN COUNTY...

AT 817 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
LIGHT TO MODERATE RAIN FALLING OVER THE WARNED AREA. THIS ADDITIONAL 
RAIN WILL SLOW THE RATE WHICH WATER FROM EARLIER HEAVY RAINS RECEDE.
 
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO YADKINVILLE 
AND SHACKTOWN

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.

&&

LAT...LON 3613 8074 3616 8060 3612 8052 3609 8052
      3608 8057 3605 8061 3605 8074

$$

DS

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 14, 4:30 PM EDTSpecial Weather StatementRNKYadkin30 min
May 14, 4:38 PM EDTSpecial Weather StatementRNKWatauga37 min
May 14, 5:05 PM EDTSpecial Weather StatementRNKWilkes25 min
May 14, 5:21 PM EDTFlash Flood WarningRNKWilkes6 hr
May 14, 5:35 PM EDTSevere Thunderstorm WarningRNKWilkes39 min
May 14, 5:53 PM EDTSevere Thunderstorm WarningRNKWilkes34 min
May 14, 6:16 PM EDTSevere Thunderstorm WarningRNKWilkes, Yadkin59 min
May 14, 6:20 PM EDTFlash Flood WatchRNKStokes, Surry, Wilkes, Yadkin11 hr

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.