Alert archive / Virginia / Flash Flood Warnings in 2011

Flash Flood Warning 74, NWS Blacksburg, VA

September 4, 2011Bland County, Tazewell County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Sep 4, 2011, 3:26 PM EDT for Bland County, Tazewell County, Virginia. 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: Sep 4, 2011, 3:26 PM EDT (19:26 UTC)
Expired: Sep 4, 2011, 6:47 PM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Bland County, VA, Tazewell County, VA

The radar

The Roanoke radar (KFCX), 95 km from the middle of the area, began a volume at 19:28 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

Roanoke, VA (KRNK), launched 12:00Z, 7.4 hours before the alert went out and 162 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: 259 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 32 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.

738 
WGUS51 KRNK 041926
FFWRNK
VAC021-185-050130-
/O.NEW.KRNK.FF.W.0074.110904T1926Z-110905T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
326 PM EDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL TAZEWELL COUNTY IN SOUTHWEST VIRGINIA
  CENTRAL BLAND COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 930 PM EDT.

* AT 316 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* THE STORM PRODUCING VERY HEAVY RAIN WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTIES...AND ALONG THE EAST 
  FORK OF COVE CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 3716 8144 3725 8124 3723 8122 3719 8119
      3711 8141

$$

AMS

1 follow-up statement

980 
WGUS71 KRNK 042247
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
647 PM EDT SUN SEP 4 2011

VAC021-185-042257-
/O.CAN.KRNK.FF.W.0074.000000T0000Z-110905T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TAZEWELL VA-BLAND VA-
647 PM EDT SUN SEP 4 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN TAZEWELL
AND CENTRAL BLAND COUNTIES...

ANY FLOODING HAS ENDED OVER THE WARNED AREA...THUS THE FLASH FLOOD 
WARNING HAS BEEN CANCELLED.

LAT...LON 3716 8144 3725 8124 3723 8122 3719 8119
      3711 8141

$$

AMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 3:07 AM EDT	Dense Fog Advisory	RNK	Alleghany, Bath, Bland, Botetourt, Carroll, Craig and 14 more	6 hr
Sep 4, 3:25 PM EDT	Flash Flood Watch	RNK	Alleghany, Amherst, Appomattox, Bath, Bedford, Bland and 31 more	60 hr
Sep 4, 4:24 PM EDT	Special Weather Statement	RNK	Craig, Roanoke	36 min
Sep 4, 7:11 PM EDT	Special Weather Statement	RNK	Bedford	64 min

Nearby

Flash Flood Warnings in Virginia, 2011 Every 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.