Alert archive / North Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 71, NWS Blacksburg, VA

September 2, 2011Surry County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Sep 2, 2011, 5:16 PM EDT for Surry County, North Carolina. It was in force for 4 hr. 1 report 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
Sep 2, 2011, 5:16 PM EDT (21:16 UTC)
Expired
Sep 2, 2011, 9:10 PM EDT
In force
4 hr
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon
Flood severity
None

County Surry County, NC

The radar

The Roanoke radar (KFCX), 75 km from the middle of the area, began a volume at 21:19 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

TimeReportWhereRemark
Sep 2, 5:30 PM EDTFLASH FLOOD3 Ene Level Cross, NCSEVERAL INCHES OF WATER ON ROAD. ROAD NOT VISIBLE BY DRIVERS.

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

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.3 hours before the alert went out and 67 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 2011-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 377 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 2011-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 165 square meters per square second.1939Sfc1 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
377 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
1087 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
165 m²/s²
0-3 km storm-relative helicity
182 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The text

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

208 
WGUS51 KRNK 022116
FFWRNK
NCC171-030315-
/O.NEW.KRNK.FF.W.0071.110902T2116Z-110903T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
516 PM EDT FRI SEP 2 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL SURRY COUNTY IN NORTH CENTRAL NORTH CAROLINA

* UNTIL 1115 PM EDT.

* AT 507 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN ABOUT TO ENTER THE AREA FROM THE NORTH IN 
ASSOCIATION WITH A LINE OF SHOWERS AND STORMS. THIS ADDITIONAL 
AMOUNT OF RAIN MAY PROMPT FLASH FLOODING OF THE ROOT RIVER OR ITS 
TRIBUTARIES INCLUDING TOMS CREEK...PILOT CREEK AND BULL CREEK.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PILOT
  MOUNTAIN AND ARARAT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT TRY TO CROSS WATER THAT IS FLOWING ACROSS A ROAD. TURN 
AROUND...DONT DROWN.

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 3635 8062 3641 8063 3648 8050 3642 8046
      3635 8046 3631 8053

$$

DS
2 follow-up statements
207 
WGUS71 KRNK 022213
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
613 PM EDT FRI SEP 2 2011

NCC171-030315-
/O.CON.KRNK.FF.W.0071.000000T0000Z-110903T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SURRY NC-
613 PM EDT FRI SEP 2 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT FOR
EASTERN SURRY COUNTY...

AT 611 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
HEAVY RAIN PRODUCING SHOWERS AND STORMS HAVE MOVED SOUTH OF THE 
WARNED AREA. CONCERN CONTINUES THOUGH FOR RUN OFF FROM THE EARLIER 
RAIN TO PROMPT FLASH FLOODING. AREAS OF GREATEST CONCERN ARE THOSE 
ON AND NEAR THE ROOT RIVER...TOMS CREEK...PILOT CREEK AND BULL CREEK.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ARARAT

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.

&&

LAT...LON 3635 8062 3641 8063 3648 8050 3642 8046
      3635 8046 3631 8053

$$

DS
446 
WGUS71 KRNK 030110
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
910 PM EDT FRI SEP 2 2011

NCC171-030119-
/O.CAN.KRNK.FF.W.0071.000000T0000Z-110903T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SURRY NC-
910 PM EDT FRI SEP 2 2011

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

NO REPORTS OF FLASH FLOODING HAVE BEEN RECEIVED FROM THE WARNED 
AREA...AND NO ADDITIONAL HEAVY RAIN IS EXPECTED. THEREFORE...THE 
FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3635 8062 3641 8063 3648 8050 3642 8046
      3635 8046 3631 8053

$$

DS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 2, 3:11 PM EDTSevere Thunderstorm WarningRNKStokes, Surry, Yadkin64 min
Sep 2, 3:35 PM EDTSpecial Weather StatementRNKSurry55 min
Sep 2, 3:39 PM EDTSevere Thunderstorm WarningRNKRockingham, Stokes66 min
Sep 2, 3:41 PM EDTSevere Thunderstorm WarningRNKStokes, Surry49 min
Sep 2, 4:14 PM EDTSevere Thunderstorm WarningRNKStokes, Surry, Yadkin61 min
Sep 2, 4:24 PM EDTSevere Thunderstorm WarningRNKStokes, Surry51 min
Sep 2, 4:33 PM EDTSevere Thunderstorm WarningRNKRockingham, Stokes57 min
Sep 2, 4:46 PM EDTSevere Thunderstorm WarningRNKAlleghany, Stokes, Surry, Wilkes59 min
Sep 2, 5:16 PM EDTSevere Thunderstorm WarningRNKRockingham, Stokes, Surry44 min
Sep 2, 5:19 PM EDTSevere Thunderstorm WarningRNKAlleghany, Surry, Wilkes, Yadkin71 min
Sep 2, 5:50 PM EDTSevere Thunderstorm WarningRNKAlleghany, Surry55 min
Sep 2, 6:41 PM EDTSevere Thunderstorm WarningRNKAlleghany, Ashe, Wilkes64 min
Sep 2, 7:15 PM EDTSevere Thunderstorm WarningRNKAshe, Watauga, Wilkes75 min
Sep 2, 7:44 PM EDTSpecial Weather StatementRNKAshe61 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.