Alert archive / Virginia / Flash Flood Warnings in 2012

Flash Flood Warning 21, NWS Blacksburg, VA

May 14, 2012Bland County, Giles County, Virginia

NWS Blacksburg, VA issued this flash flood warning at May 14, 2012, 9:16 PM EDT for Bland County, Giles County, Virginia. It was in force for 4 hr. 1 report 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: May 14, 2012, 9:16 PM EDT (01:16 UTC)
Expired: May 15, 2012, 1:31 AM EDT
In force: 4 hr
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Bland County, VA, Giles County, VA

The radar

The Roanoke radar (KFCX), 66 km from the middle of the area, began a volume at 01:17 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
May 14, 9:55 PM EDT	FLASH FLOOD	2 N Mechanicsburg, VA	AT LEAST SIX INCHES OF WATER FLOWING OVER PRICE RIDGE ROAD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 1.3 hours before the alert went out and 131 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: 763 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

438 
WGUS51 KRNK 150116
FFWRNK
VAC021-071-150715-
/O.NEW.KRNK.FF.W.0021.120515T0116Z-120515T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
916 PM EDT MON MAY 14 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN GILES COUNTY IN SOUTHWEST VIRGINIA
  NORTHEASTERN BLAND COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 315 AM EDT.

* AT 913 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTIES..

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.

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 3720 8104 3723 8103 3726 8093 3726 8086
      3717 8094 3716 8101

$$

DS

2 follow-up statements

265 
WGUS71 KRNK 150346
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1146 PM EDT MON MAY 14 2012

VAC021-071-150715-
/O.CON.KRNK.FF.W.0021.000000T0000Z-120515T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GILES VA-BLAND VA-
1146 PM EDT MON MAY 14 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT FOR
SOUTHWESTERN GILES AND NORTHEASTERN BLAND COUNTIES...

AT 1142 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
ONLY LIGHT SHOWERS ACROSS THE WARNED AREA. HOWEVER RUNOFF FROM HEAVY 
DOWNPOURS THAT RESULTED IN A COUPLE INCHES OF RAIN EARLIER THIS 
EVENING MAY CAUSE FLASH FLOODING OF SMALLER CREEKS AND STREAMS 
TONIGHT. ADDITIONAL SHOWERS AND STORMS MAY MOVE BACK INTO THE REGION 
AFTER MIDNIGHT POSSIBLY CAUSING ADDITIONAL FLOODING.

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.

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.

&&

LAT...LON 3720 8104 3723 8103 3726 8093 3726 8086
      3717 8094 3716 8101

$$

JH

144 
WGUS71 KRNK 150531
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
131 AM EDT TUE MAY 15 2012

VAC021-071-150538-
/O.CAN.KRNK.FF.W.0021.000000T0000Z-120515T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GILES VA-BLAND VA-
131 AM EDT TUE MAY 15 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN GILES
AND NORTHEASTERN BLAND COUNTIES...

RAINFALL HAS ENDED ACROSS THE WARNED AREA AND NO ADDITIONAL 
SIGNIFICANT RAINFALL IS EXPECTED TONIGHT. RAINFALL ACROSS THIS 
REGION WAS GENERALLY IN THE 2.0 TO 2.5 INCH RANGE MONDAY EVENING. 
CREEKS AND STREAMS IN THE REGION HAVE BEGUN TO SUBSIDE AND ALL OF 
THE MAJOR CREEKS AND STREAMS ARE WELL BELOW FLOOD STAGE AT THIS TIME.

CAUTION SHOULD STILL BE USED IN FLOOD PRONE AND LOW-LYING AREAS AS 
THERE MAY STILL BE LOCALIZED PONDING OF WATER OR MINOR FLOODING IN 
THESE AREAS THROUGH THE NIGHT.

LAT...LON 3720 8104 3723 8103 3726 8093 3726 8086
      3717 8094 3716 8101

$$



RAB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 8:02 PM EDT	Special Weather Statement	RNK	Bedford	28 min
May 14, 8:41 PM EDT	Flash Flood Warning	RNK	Bedford, Franklin	5 hr
May 14, 8:55 PM EDT	Areal Flood Warning	RNK	Amherst, Bedford, Rockbridge, City of Buena Vista, City of Lexington	6 hr
May 14, 9:10 PM EDT	Special Weather Statement	RNK	Bland	35 min
May 14, 9:23 PM EDT	Flash Flood Warning	RNK	Amherst, Bedford, Botetourt, Rockbridge, City of Buena Vista, City of Lexington	6 hr
May 15, 1:27 AM EDT	Areal Flood Advisory	RNK	Bedford, Franklin	6 hr
May 15, 1:39 AM EDT	Areal Flood Warning	RNK	Bedford, Franklin	6 hr
May 15, 3:15 AM EDT	Areal Flood Warning	RNK	Botetourt, Rockbridge, City of Buena Vista, City of Lexington	6 hr
May 15, 5:39 AM EDT	Flash Flood Watch	RNK	Amherst, Bedford, Botetourt, Carroll, Floyd, Franklin and 8 more	17 hr
May 15, 6:19 AM EDT	Dense Fog Advisory	RNK	Bland, Carroll, Floyd, Giles, Grayson, Montgomery and 6 more	4 hr
May 15, 1:11 PM EDT	Special Weather Statement	RNK	City of Galax	64 min
May 15, 4:57 PM EDT	Flash Flood Warning	RNK	Grayson	5 hr
May 15, 5:43 PM EDT	Special Weather Statement	RNK	Grayson	62 min
May 15, 5:47 PM EDT	Special Weather Statement	RNK	Wythe	58 min
May 15, 6:43 PM EDT	Severe Thunderstorm Warning	RNK	Pulaski, Wythe	62 min
May 15, 6:56 PM EDT	Flash Flood Warning	RNK	Bedford, Franklin	6 hr
May 15, 6:57 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, Franklin, Pittsylvania	63 min
May 15, 7:49 PM EDT	Special Weather Statement	RNK	Pulaski	56 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.