Alert archive / North Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 83, NWS Blacksburg, VA

September 6, 2011Ashe County, Watauga County, Wilkes County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Sep 6, 2011, 9:27 AM EDT for Ashe County, Watauga County, Wilkes County, North Carolina. It was in force for 5 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
Sep 6, 2011, 9:27 AM EDT (13:27 UTC)
Expired
Sep 6, 2011, 2:00 PM EDT
In force
5 hr
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon
Flood severity
None

Counties Ashe County, NC, Watauga County, NC, Wilkes County, NC

The radar

The Roanoke radar (KFCX), 129 km from the middle of the area, began a volume at 13:31 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, 1.5 hours before the alert went out and 136 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 2011-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1434 joules per kilogram.LCLEL10008507005003002001001 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 2011-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 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
1434 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
274 m²/s²
Significant tornado parameter
1.9
Supercell composite
11.1

Open this sounding in Storm Lab

The text

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

251 
WGUS51 KRNK 061327
FFWRNK
NCC009-189-193-061915-
/O.NEW.KRNK.FF.W.0083.110906T1327Z-110906T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
927 AM EDT TUE SEP 6 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN ASHE COUNTY IN NORTHWEST NORTH CAROLINA
  WATAUGA COUNTY IN NORTHWEST NORTH CAROLINA
  NORTHWESTERN WILKES COUNTY IN NORTHWEST NORTH CAROLINA

* UNTIL 315 PM EDT.

* AT 912 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN FROM STORMS WILL MOVE OVER THE WARNED AREA THROUGH 
EARLY AFTERNOON. IN THE LAST 24 HOURS...4 TO 7 INCHES OF RAIN HAS 
FALLEN ACROSS THE AREA. WITH THE GROUND BEING SATURATED AND 
ADDITIONAL RAINFALL EXPECTED...FLASH FLOODING IS HIGHLY LIKELY. A 
FLOOD WARNING FOR CREEKS AND STREAMS IS ALSO IN EFFECT INTO TONIGHT.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MOSES CONE
  MEMORIAL PARK...CASCADE FALLS...MOUNT JEFFERSON...GRANDFATHER
  MOUNTAIN...WAGONER...OTHELLO...IDLEWILD...GLENDALE SPRINGS...
  FLEETWOOD...BALDWIN...LAUREL SPRINGS...WILBAR...SUMMIT...MC
  GRADY...HALLS MILLS...DARBY...MAPLE SPRINGS...TODD...SEVEN
  DEVILS...SANDS...RUTHERWOOD...FOSCOE...DEEP GAP...BOONE...BLOWING
  ROCK AND AHO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF AN INCH OR MORE ARE POSSIBLE THROUGH 
2 PM THIS AFTERNOON. HIGHER AMOUNTS OF 2 TO 3 INCHES ARE POSSIBLE ON 
EASTERN SLOPES OF THE BLUE RIDGE ACROSS THE NORTH CAROLINA HIGH 
COUNTY.

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 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 3651 8133 3648 8132 3645 8127 3640 8126
      3639 8124 3637 8125 3640 8119 3630 8112
      3606 8141 3609 8149 3609 8152 3611 8155
      3611 8182 3616 8183

$$

RCS
2 follow-up statements
290 
WGUS71 KRNK 061452
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1052 AM EDT TUE SEP 6 2011

NCC009-189-193-061915-
/O.CON.KRNK.FF.W.0083.000000T0000Z-110906T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ASHE NC-WATAUGA NC-WILKES NC-
1052 AM EDT TUE SEP 6 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM EDT FOR
SOUTHEASTERN ASHE...WATAUGA AND WESTERN WILKES COUNTIES...

AT 1040 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO 
SHOW BANDS OF HEAVY RAIN TRACKING NORTHWARD OVER THE WARNED AREA. 
THESE BANDS SHOULD EXIT THE WARNED AREA BY 1130 AM. THE THREAT OF 
FLASH FLOODING IS DECLINING...HOWEVER...AREAL FLOODING FROM CREEKS 
AND STREAM REMAINS. RUNOFF WILL CONTINUE TO KEEP CREEKS AND STREAMS 
HIGH INTO THIS EVENING. ALONG WITH RUNOFF...LANDSLIDES ALSO 
POSSIBLE. EXERCISE CAUTION WHEN DRIVING TODAY.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MOUNT
JEFFERSON...WAGONER...OTHELLO...IDLEWILD...GLENDALE SPRINGS...
FLEETWOOD...BALDWIN...LAUREL SPRINGS...MC GRADY...HALLS MILLS AND
TODD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

RAINFALL ASSOCIATED WITH THIS FLASH FLOOD WILL INCREASE THE RISK OF
LANDSLIDES. IF YOU ARE NEAR STEEP SLOPES OR A MOUNTAINSIDE STREAM OR
RIVER...SEEK REFUGE ON HIGHER GROUND AWAY FROM THE STREAM
IMMEDIATELY...PREFERABLY IN A STURDY SHELTER. POTENTIAL HAZARDS TO
DRIVERS INCLUDE WASHED-OUT ROADS OR BRIDGES...FALLING ROCKS...MUD...
TREES...AND OTHER LARGE DEBRIS. REMAIN ALERT!

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 PM EDT TUESDAY AFTERNOON
FOR NORTHWESTERN NORTH CAROLINA AND SOUTHWESTERN VIRGINIA.

&&

LAT...LON 3651 8133 3648 8132 3645 8127 3640 8126
      3639 8124 3637 8125 3640 8119 3630 8112
      3606 8141 3609 8149 3609 8152 3611 8155
      3611 8182 3616 8183

$$

RCS
581 
WGUS71 KRNK 061800
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
200 PM EDT TUE SEP 6 2011

NCC009-189-193-061810-
/O.CAN.KRNK.FF.W.0083.000000T0000Z-110906T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ASHE NC-WATAUGA NC-WILKES NC-
200 PM EDT TUE SEP 6 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN
ASHE...WATAUGA AND WESTERN WILKES COUNTIES...

THE FLOOD WARNING REMAINS IN EFFECT INTO THIS EVENING. CREEKS AND 
STREAMS WILL REMAIN HIGH FOR THE NEXT 24 HOURS.


LAT...LON 3651 8133 3648 8132 3645 8127 3640 8126
      3639 8124 3637 8125 3640 8119 3630 8112
      3606 8141 3609 8149 3609 8152 3611 8155
      3611 8182 3616 8183

$$

RCS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 8:44 PM EDTFlash Flood WarningRNKWatauga, Wilkes6 hr
Sep 5, 9:01 PM EDTSpecial Weather StatementRNKSurry29 min
Sep 5, 9:13 PM EDTSevere Thunderstorm WarningRNKWilkes47 min
Sep 5, 9:20 PM EDTSpecial Weather StatementRNKRockingham, Stokes, Surry, Yadkin55 min
Sep 5, 9:40 PM EDTSevere Thunderstorm WarningRNKStokes, Surry, Wilkes, Yadkin45 min
Sep 5, 10:19 PM EDTFlash Flood WarningRNKSurry6 hr
Sep 6, 12:17 AM EDTFlash Flood WarningRNKAlleghany, Surry, Wilkes6 hr
Sep 6, 6:58 AM EDTAreal Flood WarningRNKAshe, Watauga3 hr
Sep 6, 9:48 AM EDTTornado WarningRNKStokes, Surry27 min
Sep 6, 9:57 AM EDTAreal Flood WarningRNKAlleghany, Ashe, Surry, Watauga, Wilkes12 hr
Sep 6, 11:38 AM EDTSpecial Weather StatementRNKSurry37 min
Sep 6, 1:10 PM EDTTornado WarningRNKCaswell35 min
Sep 6, 3:07 PM EDTSpecial Weather StatementRNKRockingham23 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.