Alert archive / Virginia / Flash Flood Warnings in 2011

Flash Flood Warning 59, NWS Blacksburg, VA

July 30, 2011Appomattox County, Campbell County, Charlotte County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Jul 30, 2011, 6:38 PM EDT for Appomattox County, Campbell County, Charlotte County, Virginia. It was in force for 111 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 30, 2011, 6:38 PM EDT (22:38 UTC)
Expired: Jul 30, 2011, 8:29 PM EDT
In force: 111 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Appomattox County, VA, Campbell County, VA, Charlotte County, VA

The radar

The Roanoke radar (KFCX), 128 km from the middle of the area, began a volume at 22:39 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, 10.6 hours before the alert went out and 57 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: 841 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 793 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 61 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.

956 
WGUS51 KRNK 302238
FFWRNK
VAC011-031-037-310130-
/O.NEW.KRNK.FF.W.0059.110730T2238Z-110731T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
638 PM EDT SAT JUL 30 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL CHARLOTTE COUNTY IN SOUTH CENTRAL VIRGINIA
  EAST CENTRAL CAMPBELL COUNTY IN CENTRAL VIRGINIA
  SOUTHERN APPOMATTOX COUNTY IN CENTRAL VIRGINIA

* UNTIL 930 PM EDT.

* AT 630 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 PAMPLIN   
CITY AND EVERGREEN. MAPLE SPRING BRANCH AND BIG CUB CREEK IN 
APPOMATTOX COUNTY ARE ESPECIALLY PRONE TO FLASH FLOODING WITH THIS 
HEAVY RAIN.

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.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...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 3734 7891 3734 7881 3728 7868 3717 7871
      3720 7882 3709 7893 3714 7906

$$

SK

1 follow-up statement

454 
WGUS71 KRNK 310029
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
829 PM EDT SAT JUL 30 2011

VAC011-031-037-310039-
/O.CAN.KRNK.FF.W.0059.000000T0000Z-110731T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHARLOTTE VA-CAMPBELL VA-APPOMATTOX VA-
829 PM EDT SAT JUL 30 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN
CHARLOTTE...EASTERN CAMPBELL AND SOUTHERN APPOMATTOX COUNTIES...

THE RAIN HAS MOVED WELL EAST OF THE AREA AND NO FLOODING IS BEING 
REPORTED. THUS THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3734 7891 3734 7881 3728 7868 3717 7871
      3720 7882 3709 7893 3714 7906

$$

SK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 2:35 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt	26 min
Jul 30, 2:44 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Botetourt, City of Covington	46 min
Jul 30, 3:27 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Buena Vista, City of Lexington	33 min
Jul 30, 3:32 PM EDT	Special Weather Statement	RNK	City of Roanoke	58 min
Jul 30, 3:38 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Roanoke, City of Roanoke	36 min
Jul 30, 4:10 PM EDT	Special Weather Statement	RNK	Franklin	35 min
Jul 30, 4:12 PM EDT	Special Weather Statement	RNK	Amherst, City of Lynchburg	63 min
Jul 30, 4:17 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Bedford, City of Lynchburg	43 min
Jul 30, 4:49 PM EDT	Special Weather Statement	RNK	Franklin	41 min
Jul 30, 5:10 PM EDT	Special Weather Statement	RNK	Floyd	50 min
Jul 30, 5:11 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, Halifax, Pittsylvania	49 min
Jul 30, 5:27 PM EDT	Special Weather Statement	RNK	Buckingham	48 min
Jul 30, 5:36 PM EDT	Special Weather Statement	RNK	Giles	39 min
Jul 30, 5:59 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox, Buckingham, Campbell, Charlotte	61 min
Jul 30, 6:15 PM EDT	Special Weather Statement	RNK	Giles, Roanoke	45 min
Jul 30, 6:23 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania, City of Danville	37 min
Jul 30, 6:44 PM EDT	Special Weather Statement	RNK	Wythe	31 min
Jul 30, 7:13 PM EDT	Special Weather Statement	RNK	Halifax	32 min
Jul 30, 7:46 PM EDT	Special Weather Statement	RNK	Halifax	14 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.