Alert archive / Virginia / Flash Flood Warnings in 2012

Flash Flood Warning 8, NWS Blacksburg, VA

March 24, 2012Surry County, North Carolina; Carroll County, Patrick County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Mar 24, 2012, 2:52 PM EDT for Surry County, North Carolina; Carroll County, Patrick County, Virginia. It was in force for 6 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, 2:52 PM EDT (18:52 UTC)
Expired: Mar 24, 2012, 8:45 PM EDT
In force: 6 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Surry County, NC, Carroll County, VA, Patrick County, VA

The radar

The Roanoke radar (KFCX), 67 km from the middle of the area, began a volume at 18:56 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, 4:25 PM EDT	FLASH FLOOD	2 Wsw Cana, VA	PAULS CREEK FLOODING A BRIDGE ALONG APPLE RIDGE ROAD.
Mar 24, 6:30 PM EDT	FLASH FLOOD	3 W Groundhog Mountain, VA	THREE MUDSLIDES CLOSED WILLIS GAP MOUNTAIN ROAD.

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, 6.9 hours before the alert went out and 96 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.

571 
WGUS51 KRNK 241852
FFWRNK
NCC171-VAC035-141-250045-
/O.NEW.KRNK.FF.W.0008.120324T1852Z-120325T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN SURRY COUNTY IN NORTH CENTRAL NORTH CAROLINA
  WEST CENTRAL PATRICK COUNTY IN SOUTHWEST VIRGINIA
  EASTERN CARROLL COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 845 PM EDT.

* AT 247 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM REPEATED THUNDERSTORMS OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAUREL
  FORK...GLADESBORO...DUGSPUR AND FANCY GAP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

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 3642 8092 3647 8095 3656 8088 3656 8084
      3659 8086 3690 8061 3679 8053 3668 8046
      3640 8083

$$

PC

2 follow-up statements

941 
WGUS71 KRNK 242045
FFSRNK

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

NCC171-VAC035-141-250045-
/O.CON.KRNK.FF.W.0008.000000T0000Z-120325T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SURRY NC-PATRICK VA-CARROLL VA-
445 PM EDT SAT MAR 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR
NORTHWESTERN SURRY...WESTERN PATRICK AND EASTERN CARROLL COUNTIES...

AT 438 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED 
HEAVIER STORMS MOVING OUT OF THE WARNED AREA. HOWEVER...RADAR 
ESTIMATES SHOW THAT 3 TO 4 INCHES HAVE FALLEN ALONG THE BLUE RIDGE 
SINCE 200 PM. RUNOFF FROM THIS WILL CAUSE FLASH FLOODING ALONG AND 
EITHER SIDE OF THE BLUE RIDGE.

SOME CREEKS THAT ARE PRONE TO FLASH FLOODING INCLUDE LOVILLS CREEK 
NEAR CANA...CHANCES CREEK NEAR FANCY GAP AND PINE CREEK SOUTH OF 
LAUREL FORK. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

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 3642 8092 3647 8095 3656 8088 3656 8084
      3659 8086 3690 8061 3679 8053 3668 8046
      3640 8083

$$

WP

084 
WGUS71 KRNK 250040
FFSRNK

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

NCC171-VAC035-141-250049-
/O.EXP.KRNK.FF.W.0008.000000T0000Z-120325T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SURRY NC-PATRICK VA-CARROLL VA-
840 PM EDT SAT MAR 24 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM EDT FOR NORTHWESTERN
SURRY...WESTERN PATRICK AND EASTERN CARROLL COUNTIES...

THE THREAT OF FLASH FLOODING HAS ENDED AND THE WARNING WILL BE 
ALLOWED TO EXPIRE. HOWEVER...A NEW FLOOD ADVISORY WILL BE ISSUED TO 
COVER THE SMALL CREEKS FROM CANA INTO PATRICK COUNTY...THAT ARE 
STILL RUNNING HIGH...ESPECIALLY LOVILLS CREEK.

LAT...LON 3642 8092 3647 8095 3656 8088 3656 8084
      3659 8086 3690 8061 3679 8053 3668 8046
      3640 8083

$$

WP

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 24, 12:24 PM EDT	Special Weather Statement	RNK	Alleghany	51 min
Mar 24, 12:43 PM EDT	Special Weather Statement	RNK	Wilkes	47 min
Mar 24, 12:48 PM EDT	Special Weather Statement	RNK	Stokes	42 min
Mar 24, 1:30 PM EDT	Severe Thunderstorm Warning	RNK	Ashe	60 min
Mar 24, 2:00 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Surry	60 min
Mar 24, 2:34 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe	56 min
Mar 24, 2:34 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Surry, Wilkes	56 min
Mar 24, 2:44 PM EDT	Severe Thunderstorm Warning	RNK	Surry	61 min
Mar 24, 3:26 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Surry	64 min
Mar 24, 4:08 PM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry, Wilkes, Yadkin	67 min
Mar 24, 4:31 PM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry, Yadkin	44 min
Mar 24, 5:35 PM EDT	Severe Thunderstorm Warning	RNK	Surry	55 min
Mar 24, 6:05 PM EDT	Flash Flood Warning	RNK	Surry	4 hr
Mar 24, 6:07 PM EDT	Severe Thunderstorm Warning	RNK	Stokes	53 min
Mar 24, 6:16 PM EDT	Special Weather Statement	RNK	Alleghany	29 min
Mar 24, 6:45 PM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	60 min
Mar 24, 7:39 PM EDT	Severe Thunderstorm Warning	RNK	Caswell	81 min
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, 1:57 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Smyth, Tazewell, Wythe	63 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, 2:57 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles, Pulaski, Wythe	63 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, 4:15 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, 5:17 PM EDT	Flash Flood Warning	RNK	Floyd, Patrick	5 hr
Mar 24, 5:24 PM EDT	Tornado Warning	RNK	Henry, Patrick	36 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, 6:19 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, 7:57 PM EDT	Special Weather Statement	RNK	Buckingham	33 min

Nearby

Flash Flood Warnings in Virginia, 2012 Flash Flood Warnings in North Carolina, 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.