Alert archive / Virginia / Flash Flood Warnings in 2012

Flash Flood Warning 9, NWS Blacksburg, VA

March 24, 2012Floyd County, Patrick County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Mar 24, 2012, 5:17 PM EDT for Floyd County, Patrick County, Virginia. It was in force for 5 hr. 2 reports 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: Mar 24, 2012, 5:17 PM EDT (21:17 UTC)
Expired: Mar 24, 2012, 10:44 PM EDT
In force: 5 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Floyd County, VA, Patrick County, VA

The radar

The Roanoke radar (KFCX), 35 km from the middle of the area, began a volume at 21:17 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

Time	Report	Where	Remark
Mar 24, 6:16 PM EDT	FLASH FLOOD	2 N Mount Herman, VA	ARCHIES CREEK FLOODED AND CLOSED ARCHIES CREEK ROAD.
Mar 24, 6:20 PM EDT	FLASH FLOOD	2 Ssw Carters Mill, VA	WATER FLOWING ACROSS UNITY CHURCH ROAD... RESULTING IN ITS CLOSURE.

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 85 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: 226 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

289 
WGUS51 KRNK 242117
FFWRNK
VAC063-141-250315-
/O.NEW.KRNK.FF.W.0009.120324T2117Z-120325T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
517 PM EDT SAT MAR 24 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN PATRICK COUNTY IN SOUTHWEST VIRGINIA
  SOUTH CENTRAL FLOYD COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 1115 PM EDT.

* AT 508 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM A THUNDERSTORMS OVER THE WARNED AREA. RADAR 
  ESTIMATES THAT 2 TO 4 INCHES HAVE FALLEN ALONG AND EITHER SIDE OF 
  THE BLUE RIDGE SINCE 3 PM. ANOTHER BAND OF THUNDERSTORMS WILL MOVE 
  ACROSS THE AREA...ADDING MORE HEAVY RAIN.  FLASH FLOODING IS 
  LIKELY ACROSS THIS AREA...INCLUDING ROUND MEADOW CREEK NEAR 
  MEADOWS OF DAN...BIG IVY CREEK NEAR MEADOWS OF DAN...AND SMALLER 
  CREEKS NEAR HIGHWAY 8 BETWEEN FLOYD AND STUART.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCKY KNOB
  RECREATION AREA...ROCKY KNOB SUMMIT...MABRY MILL...WOOLWINE...
  MEADOWS OF DAN...CHARITY AND BUFFALO RIDGE.

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.

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 3656 8061 3660 8057 3668 8046 3670 8045
      3673 8049 3679 8052 3691 8026 3690 8021
      3687 8023 3685 8016 3655 8038

$$

WP

2 follow-up statements

660 
WGUS71 KRNK 250029
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
829 PM EDT SAT MAR 24 2012

VAC063-250036-
/O.CAN.KRNK.FF.W.0009.000000T0000Z-120325T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FLOYD VA-
829 PM EDT SAT MAR 24 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHERN FLOYD
COUNTY...

COUNTY DISPATCH REPORT NO FLOODING ACROSS THE COUNTY...AND THE 
THREAT OF FLASH FLOODING HAS ENDED. THERE WILL STILL BE SOME AREAS 
CLOSER TO THE PATRICK COUNTY LINE THAT COULD HAVE STANDING 
WATER...SO USE CAUTION IF TRAVELING TONIGHT.

LAT...LON 3656 8061 3660 8057 3668 8046 3673 8043
      3674 8041 3674 8040 3675 8039 3687 8023
      3685 8016 3655 8038

$$

VAC141-250315-
/O.CON.KRNK.FF.W.0009.000000T0000Z-120325T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PATRICK VA-
829 PM EDT SAT MAR 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT FOR
WESTERN PATRICK COUNTY...

AT 822 PM EDT...DEPARTMENT OF HIGHWAYS REPORTED FLOODING OCCURRING 
IN THE ARARAT AREA...SPECIFICALLY DOE RUN CREEK AND CLARKS CREEK.

THE HEAVIER RAINS HAVE ENDED...BUT RUNOFF FROM THE TORRENTIAL RAINS 
EARLIER...WILL KEEP STREAMS AND CREEKS OUT OF THEIR BANKS INTO THE 
EVENING.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
WOOLWINE...CHARITY AND BUFFALO RIDGE

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.

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 3656 8061 3660 8057 3668 8046 3673 8043
      3674 8041 3674 8040 3675 8039 3687 8023
      3685 8016 3655 8038

$$

WP

729 
WGUS71 KRNK 250244
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1044 PM EDT SAT MAR 24 2012

VAC141-250254-
/O.CAN.KRNK.FF.W.0009.000000T0000Z-120325T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PATRICK VA-
1044 PM EDT SAT MAR 24 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN PATRICK
COUNTY...

FLASH FLOODING HAS ENDED OVER THE WARNED AREA...THUS THE FLASH FLOOD 
WARNING HAS BEEN CANCELLED. HOWEVER...STREAMS WILL BE RUNNING HIGH 
INTO EARLY MORNING...AND SOME ROADS COULD STILL HAVE STANDING WATER 
ON THEM...SO CAUTION IS ADVISED IF TRAVELING.

LAT...LON 3656 8061 3660 8057 3668 8046 3673 8043
      3674 8041 3674 8040 3675 8039 3687 8023
      3685 8016 3655 8038

$$

WP

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 24, 12:32 PM EDT	Special Weather Statement	RNK	Grayson, Wythe	43 min
Mar 24, 1:21 PM EDT	Special Weather Statement	RNK	Carroll	39 min
Mar 24, 1:25 PM EDT	Special Weather Statement	RNK	Grayson	50 min
Mar 24, 1:28 PM EDT	Special Weather Statement	RNK	Wythe	47 min
Mar 24, 1:30 PM EDT	Severe Thunderstorm Warning	RNK	Grayson, Smyth, Wythe	60 min
Mar 24, 1:57 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Smyth, Tazewell, Wythe	63 min
Mar 24, 2:00 PM EDT	Severe Thunderstorm Warning	RNK	Carroll	60 min
Mar 24, 2:22 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Grayson, Pulaski, Smyth, Wythe	53 min
Mar 24, 2:30 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Tazewell	60 min
Mar 24, 2:34 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, Wythe, City of Galax	56 min
Mar 24, 2:34 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, City of Galax	56 min
Mar 24, 2:44 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Floyd, Patrick	61 min
Mar 24, 2:52 PM EDT	Flash Flood Warning	RNK	Carroll, Patrick	6 hr
Mar 24, 2:57 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles, Pulaski, Wythe	63 min
Mar 24, 3:26 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, City of Galax	64 min
Mar 24, 3:30 PM EDT	Special Weather Statement	RNK	Pulaski	30 min
Mar 24, 3:37 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Craig, Giles, Montgomery, Pulaski	53 min
Mar 24, 3:39 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Henry, Patrick	66 min
Mar 24, 3:46 PM EDT	Tornado Warning	RNK	Floyd, Patrick	29 min
Mar 24, 4:08 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Patrick	67 min
Mar 24, 4:15 PM EDT	Tornado Warning	RNK	Franklin, Patrick	30 min
Mar 24, 4:26 PM EDT	Special Weather Statement	RNK	Alleghany	34 min
Mar 24, 4:41 PM EDT	Tornado Warning	RNK	Franklin	34 min
Mar 24, 4:48 PM EDT	Tornado Warning	RNK	Patrick	42 min
Mar 24, 5:09 PM EDT	Tornado Warning	RNK	Bedford, Franklin	36 min
Mar 24, 5:24 PM EDT	Tornado Warning	RNK	Henry, Patrick	36 min
Mar 24, 5:35 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Patrick	55 min
Mar 24, 5:38 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, Pittsylvania	67 min
Mar 24, 5:51 PM EDT	Tornado Warning	RNK	Franklin, Henry, City of Martinsville	39 min
Mar 24, 6:05 PM EDT	Tornado Warning	RNK	Campbell	25 min
Mar 24, 6:07 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	53 min
Mar 24, 6:16 PM EDT	Special Weather Statement	RNK	Grayson	29 min
Mar 24, 6:19 PM EDT	Tornado Warning	RNK	Pittsylvania	41 min
Mar 24, 6:25 PM EDT	Flash Flood Warning	RNK	Franklin, Henry, Patrick	4 hr
Mar 24, 6:25 PM EDT	Tornado Warning	RNK	Amherst, Bedford, Campbell, City of Lynchburg	35 min
Mar 24, 6:33 PM EDT	Severe Thunderstorm Warning	RNK	Henry, City of Martinsville	34 min
Mar 24, 6:46 PM EDT	Areal Flood Advisory	RNK	Amherst, Bedford, Campbell, City of Lynchburg	3 hr
Mar 24, 6:53 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox, Campbell	37 min
Mar 24, 7:04 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania	56 min
Mar 24, 7:30 PM EDT	Special Weather Statement	RNK	Buckingham	30 min
Mar 24, 7:39 PM EDT	Severe Thunderstorm Warning	RNK	Campbell, Charlotte, Halifax, Pittsylvania	81 min
Mar 24, 7:57 PM EDT	Special Weather Statement	RNK	Buckingham	33 min

Nearby

Flash Flood Warnings in Virginia, 2012 Every flash flood warning in 2012

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.