Alert archive / Virginia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 63, NWS Blacksburg, VA

April 26, 20125 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Apr 26, 2012, 8:57 AM EDT for 5 counties in Virginia. It was in force for 63 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: Apr 26, 2012, 8:57 AM EDT (12:57 UTC)
Expired: Apr 26, 2012, 10:00 AM EDT
In force: 63 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Bland County, VA, Grayson County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 121 km from the middle of the area, began a volume at 12:59 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 1.0 hours before the alert went out and 189 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: 36 J/kg
Mixed-layer CIN: -279 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 265 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.

950 
WUUS51 KRNK 261257
SVRRNK
VAC021-077-173-185-197-261400-
/O.NEW.KRNK.SV.W.0063.120426T1257Z-120426T1400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
857 AM EDT THU APR 26 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SMYTH COUNTY IN SOUTHWEST VIRGINIA
  TAZEWELL COUNTY IN SOUTHWEST VIRGINIA
  SOUTHWESTERN WYTHE COUNTY IN SOUTHWEST VIRGINIA
  NORTHWESTERN GRAYSON COUNTY IN SOUTHWEST VIRGINIA
  SOUTHWESTERN BLAND COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 1000 AM EDT.

* AT 855 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM RAVEN TO 8 MILES SOUTH OF CHILHOWIE...OR ALONG A LINE
  EXTENDING FROM RICHLANDS TO 8 MILES SOUTH OF CHILHOWIE...AND MOVING
  EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ALLISON GAP...
  BANDY...
  CLIFFIELD...
  HUNGRY MOTHER STATE PARK...
  MOUNT ROGERS NATIONAL RECREATION AREA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
TENNESSEE.

WHEN IT IS SAFE TO DO SO...PLEASE SEND YOUR REPORTS OF QUARTER OR
LARGER SIZED HAIL...AS WELL AS WIND DAMAGE...INCLUDING TREES OR LARGE
LIMBS DOWNED BY CALLING THE NATIONAL WEATHER SERVICE TOLL FREE AT...
1...8 6 6...2 1 5...4 3 2 4.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 PM EDT
THURSDAY AFTERNOON FOR NORTHWESTERN NORTH CAROLINA AND SOUTHWEST
VIRGINIA.

&&

LAT...LON 3719 8179 3725 8174 3721 8168 3721 8156
      3723 8152 3726 8150 3729 8141 3669 8118
      3667 8131 3668 8153 3664 8161 3696 8181
      3698 8179 3704 8182 3710 8189 3715 8191
TIME...MOT...LOC 1257Z 258DEG 55KT 3709 8183 3669 8170

$$

2 follow-up statements

712 
WWUS51 KRNK 261314 RRA
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
914 AM EDT THU APR 26 2012

VAC021-077-173-185-197-261400-
/O.CON.KRNK.SV.W.0063.000000T0000Z-120426T1400Z/
SMYTH VA-TAZEWELL VA-WYTHE VA-GRAYSON VA-BLAND VA-
914 AM EDT THU APR 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM EDT
FOR SMYTH...TAZEWELL...SOUTHWESTERN WYTHE...NORTHERN GRAYSON AND
SOUTHWESTERN BLAND COUNTIES...

AT 913 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM TAZEWELL TO TROUTDALE...MOVING EAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  ASBERRYS...
  TIPTOP...
  GRATTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN BLACKSBURG AT...1...8 6 6...2 1 5...4 3 2 4...WHEN YOU CAN
DO SO SAFELY. ONCE AGAIN THAT NUMBER IS 1...8 6 6...2 1 5...4 3 2 4.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 PM EDT
THURSDAY AFTERNOON FOR NORTHWESTERN NORTH CAROLINA AND SOUTHWEST
VIRGINIA.

&&

LAT...LON 3719 8179 3725 8174 3721 8168 3721 8156
      3723 8152 3726 8150 3729 8141 3669 8118
      3667 8131 3668 8153 3664 8161 3696 8181
      3698 8179 3704 8182 3710 8189 3715 8191
TIME...MOT...LOC 1315Z 259DEG 50KT 3713 8154 3672 8141

$$

022 
WWUS51 KRNK 261356
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
956 AM EDT THU APR 26 2012

VAC021-077-173-185-197-261407-
/O.EXP.KRNK.SV.W.0063.000000T0000Z-120426T1400Z/
SMYTH VA-TAZEWELL VA-WYTHE VA-GRAYSON VA-BLAND VA-
956 AM EDT THU APR 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR SMYTH...TAZEWELL...
SOUTHWESTERN WYTHE...NORTHERN GRAYSON AND SOUTHWESTERN BLAND COUNTIES
EXPIRES AT 1000 AM EDT...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW
SEVERE LIMITS. THUS THE WARNING WILL BE ALLOWED TO EXPIRE.

TO REPORT SEVERE WEATHER...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN BLACKSBURG AT...1...8 6 6...2 1 5...4 3 2 4. ONCE AGAIN
THAT NUMBER IS 1...8 6 6...2 1 5...4 3 2 4.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 PM EDT
THURSDAY AFTERNOON FOR NORTHWESTERN NORTH CAROLINA AND SOUTHWEST
VIRGINIA.

LAT...LON 3719 8179 3725 8174 3721 8168 3721 8156
      3723 8152 3726 8150 3729 8141 3669 8118
      3667 8131 3668 8153 3664 8161 3696 8181
      3698 8179 3704 8182 3710 8189 3715 8191
TIME...MOT...LOC 1357Z 259DEG 50KT 3724 8082 3683 8069

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 11:39 PM EDT	Special Weather Statement	RNK	Bland	36 min
Apr 25, 11:52 PM EDT	Severe Thunderstorm Warning	RNK	Smyth, Tazewell	23 min
Apr 26, 12:17 AM EDT	Special Weather Statement	RNK	Smyth	28 min
Apr 26, 12:39 AM EDT	Special Weather Statement	RNK	Grayson, City of Galax	36 min
Apr 26, 1:15 AM EDT	Special Weather Statement	RNK	Patrick	15 min
Apr 26, 2:38 AM EDT	Special Weather Statement	RNK	Carroll	37 min
Apr 26, 4:31 AM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	29 min
Apr 26, 4:56 AM EDT	Special Weather Statement	RNK	Bland, Botetourt, Craig, Giles, Montgomery, Pulaski and 5 more	34 min
Apr 26, 7:59 AM EDT	Areal Flood Advisory	RNK	Tazewell	3 hr
Apr 26, 8:31 AM EDT	Special Weather Statement	RNK	Smyth	59 min
Apr 26, 8:45 AM EDT	Severe Thunderstorm Warning	RNK	Grayson	60 min
Apr 26, 9:18 AM EDT	Special Weather Statement	RNK	Carroll, Grayson, City of Galax	27 min
Apr 26, 9:31 AM EDT	Special Weather Statement	RNK	Bland, Wythe	29 min
Apr 26, 10:42 AM EDT	Special Weather Statement	RNK	Henry, City of Danville	63 min
Apr 26, 11:09 AM EDT	Areal Flood Advisory	RNK	Tazewell	3 hr
Apr 26, 11:54 AM EDT	Areal Flood Advisory	RNK	Bland	3 hr
Apr 26, 12:44 PM EDT	Areal Flood Advisory	RNK	Alleghany, Bath, City of Covington	6 hr
Apr 26, 2:03 PM EDT	Areal Flood Advisory	RNK	Tazewell	6 hr
Apr 26, 2:53 PM EDT	Areal Flood Advisory	RNK	Bland	3 hr
Apr 26, 6:16 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles	59 min
Apr 26, 7:00 PM EDT	Flash Flood Warning	RNK	Bland, Tazewell	6 hr
Apr 26, 7:10 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles, Tazewell, Wythe	65 min
Apr 26, 7:53 PM EDT	Severe Thunderstorm Warning	RNK	Craig, Giles, Montgomery	52 min
Apr 26, 7:56 PM EDT	Special Weather Statement	RNK	Bath	64 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2012 Every severe thunderstorm 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.