Alert archive / Virginia / Flash Flood Warnings in 2012

Flash Flood Warning 3, NWS Blacksburg, VA

March 20, 2012Franklin County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Mar 20, 2012, 6:01 PM EDT for Franklin County, Virginia. It was in force for 97 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: Mar 20, 2012, 6:01 PM EDT (22:01 UTC)
Expired: Mar 20, 2012, 7:38 PM EDT
In force: 97 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

County Franklin County, VA

The radar

The Roanoke radar (KFCX), 48 km from the middle of the area, began a volume at 22:04 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, 10.0 hours before the alert went out and 23 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: 287 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 1105 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

109 
WGUS51 KRNK 202201
FFWRNK
VAC067-210100-
/O.NEW.KRNK.FF.W.0003.120320T2201Z-120321T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
601 PM EDT TUE MAR 20 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN FRANKLIN COUNTY IN WEST CENTRAL VIRGINIA

* UNTIL 900 PM EDT.

* AT 555 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 COUNTY..

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AS OF 555 PM EDT...RADAR ESTIMATES OF OVER 2 INCHES IN ABOUT AN HOUR 
HAD FALLEN...AND AN ADDITIONAL RAINFALL OF UP TO AN INCH IS STILL 
POSSIBLE IN THE WARNED AREA. CREEKS VUNERABLE INCLUDE GILLS CREEK 
AND INDIAN CREEK.

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 3718 7988 3722 7981 3721 7981 3723 7979
      3720 7978 3719 7975 3708 7962 3706 7959
      3698 7967

$$



SK

1 follow-up statement

874 
WGUS71 KRNK 202338
FFSRNK

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
738 PM EDT TUE MAR 20 2012

VAC067-202347-
/O.CAN.KRNK.FF.W.0003.000000T0000Z-120321T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRANKLIN VA-
738 PM EDT TUE MAR 20 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
FRANKLIN COUNTY...

RAIN HAS ENDED OVER THE WARNED AREA AND NO REPORTS OF FLASH FLOODING 
HAVE BEEN RECEIVED AT THE NATIONAL WEATHER SERVICE. STREAMS AND 
CREEKS ARE LIKELY RECEDING...THUS THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED.

LAT...LON 3718 7988 3722 7981 3721 7981 3723 7979
      3720 7978 3719 7975 3708 7962 3706 7959
      3698 7967

$$

SK

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 19, 8:25 PM EDT	Special Weather Statement	RNK	Botetourt	65 min
Mar 19, 8:32 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Botetourt	43 min
Mar 20, 1:39 PM EDT	Special Weather Statement	RNK	Bath	66 min
Mar 20, 2:11 PM EDT	Special Weather Statement	RNK	Floyd	64 min
Mar 20, 2:26 PM EDT	Special Weather Statement	RNK	City of Buena Vista	64 min
Mar 20, 3:40 PM EDT	Special Weather Statement	RNK	Botetourt	35 min
Mar 20, 4:28 PM EDT	Special Weather Statement	RNK	Campbell	32 min
Mar 20, 4:30 PM EDT	Special Weather Statement	RNK	Craig	30 min
Mar 20, 4:34 PM EDT	Severe Thunderstorm Warning	RNK	Campbell, Halifax, Pittsylvania	56 min
Mar 20, 4:41 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt, Craig, Roanoke	49 min
Mar 20, 5:01 PM EDT	Severe Thunderstorm Warning	RNK	Bedford	20 min
Mar 20, 5:31 PM EDT	Severe Thunderstorm Warning	RNK	Franklin	43 min
Mar 20, 5:42 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania, City of Danville	63 min
Mar 20, 6:03 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania	35 min
Mar 20, 6:12 PM EDT	Flash Flood Warning	RNK	Pittsylvania	4 hr
Mar 20, 6:43 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania	62 min
Mar 20, 7:07 PM EDT	Special Weather Statement	RNK	Campbell	38 min
Mar 20, 7:53 PM EDT	Flash Flood Warning	RNK	Appomattox	4 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.