Alert archive / Virginia / Flash Flood Warnings in 2011

Flash Flood Warning 16, NWS Blacksburg, VA

May 10, 2011Smyth County, Tazewell County, Virginia

NWS Blacksburg, VA issued this flash flood warning at May 10, 2011, 10:06 PM EDT for Smyth County, Tazewell County, Virginia. 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 10, 2011, 10:06 PM EDT (02:06 UTC)
Expired: May 11, 2011, 4:00 AM EDT
In force: 6 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Smyth County, VA, Tazewell County, VA

The radar

The Roanoke radar (KFCX), 128 km from the middle of the area, began a volume at 02:05 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 00:00Z, 2.1 hours before the alert went out and 189 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: 694 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 1286 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 420 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 11.6

Open this sounding in Storm Lab

The text

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

714 
WGUS51 KRNK 110206
FFWRNK
VAC173-185-110800-
/O.NEW.KRNK.FF.W.0016.110511T0206Z-110511T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
1006 PM EDT TUE MAY 10 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN SMYTH COUNTY IN SOUTHWEST VIRGINIA
  WESTERN TAZEWELL COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 400 AM EDT.

* AT 1001 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED VERY HEAVY RAIN...RAINFALL RATES UP TO 4 
  INCHES PER HOUR...FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HUNGRY
  MOTHER STATE PARK...RICHLANDS...RAVEN...JEWELL RIDGE...GLEN
  BURKE...CLIFFIELD...CLAYPOOL HILL...CEDAR BLUFF...BANDY...
  SALTVILLE...QUARRY...MARION...CHILHOWIE...BROADFORD AND ALLISON
  GAP.

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.

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 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 3718 8187 3721 8177 3725 8174 3723 8171
      3673 8141 3671 8153 3666 8154 3663 8161
      3665 8164 3679 8170 3696 8181 3696 8179
      3704 8182 3714 8191

$$

RCS

2 follow-up statements

387 
WGUS71 KRNK 110442
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1242 AM EDT WED MAY 11 2011

VAC173-185-110800-
/O.CON.KRNK.FF.W.0016.000000T0000Z-110511T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SMYTH VA-TAZEWELL VA-
1242 AM EDT WED MAY 11 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 AM EDT FOR
WESTERN TAZEWELL AND WESTERN SMYTH COUNTIES...

AT 1238 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT HEAVY RAIN HAD EXITED THE WARNED AREA. HOWEVER...RUNOFF FROM 
THE EARLIER RAINS IS STILL POSSIBLE AND MAY PROMPT FLASH FLOODING IN 
LOW LYING AREAS AND SMALL STREAMS. ADDITIONAL HEAVY RAIN SHOWERS OR 
STORMS MAY ENTER THE COUNTY AFTER 200 AM.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RICHLANDS...
RAVEN...JEWELL RIDGE...GLEN BURKE...CLIFFIELD...CLAYPOOL HILL...CEDAR
BLUFF AND BANDY

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 3718 8187 3721 8177 3725 8174 3723 8171
      3673 8141 3671 8153 3666 8154 3663 8161
      3665 8164 3679 8170 3696 8181 3696 8179
      3704 8182 3714 8191

$$

DS

720 
WGUS71 KRNK 110754
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
354 AM EDT WED MAY 11 2011

VAC173-185-110805-
/O.EXP.KRNK.FF.W.0016.000000T0000Z-110511T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SMYTH VA-TAZEWELL VA-
354 AM EDT WED MAY 11 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 AM EDT FOR WESTERN
TAZEWELL AND WESTERN SMYTH COUNTIES...

CREEKS AND STREAMS WERE RECEDING THUS THE FLASH FLOOD WARNING WILL BE
ALLOWED TO EXPIRE.

LAT...LON 3718 8187 3721 8177 3725 8174 3723 8171
      3673 8141 3671 8153 3666 8154 3663 8161
      3665 8164 3679 8170 3696 8181 3696 8179
      3704 8182 3714 8191

$$

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 8:04 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	56 min
May 10, 8:09 PM EDT	Flash Flood Warning	RNK	Montgomery	6 hr
May 10, 8:23 PM EDT	Special Weather Statement	RNK	Bedford	67 min
May 10, 8:26 PM EDT	Special Weather Statement	RNK	Bedford	64 min
May 10, 8:32 PM EDT	Special Weather Statement	RNK	Floyd, Patrick	58 min
May 10, 9:21 PM EDT	Special Weather Statement	RNK	Henry, Patrick, City of Martinsville	54 min
May 10, 9:57 PM EDT	Special Weather Statement	RNK	Grayson, Smyth	63 min
May 10, 10:31 PM EDT	Severe Thunderstorm Warning	RNK	Grayson	59 min
May 11, 3:31 AM EDT	Special Weather Statement	RNK	Tazewell	29 min
May 11, 4:16 AM EDT	Special Weather Statement	RNK	Grayson	59 min
May 11, 4:58 AM EDT	Special Weather Statement	RNK	Grayson	32 min
May 11, 6:18 PM EDT	Special Weather Statement	RNK	City of Galax	57 min
May 11, 6:25 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, Wythe, City of Galax	65 min
May 11, 7:13 PM EDT	Severe Thunderstorm Warning	RNK	Grayson	62 min
May 11, 7:44 PM EDT	Special Weather Statement	RNK	Craig	61 min
May 11, 7:51 PM EDT	Severe Thunderstorm Warning	RNK	Grayson, Smyth	54 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.