Alert archive / Virginia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 521, NWS Blacksburg, VA

August 25, 2011Carroll County, Grayson County, Virginia; Surry County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 25, 2011, 8:23 PM EDT for Carroll County, Grayson County, Virginia; Surry County, North Carolina. It was in force for 39 min. 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: Aug 25, 2011, 8:23 PM EDT (00:23 UTC)
Expired: Aug 25, 2011, 9:02 PM EDT
In force: 39 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Surry County, NC, Carroll County, VA, Grayson County, VA

The radar

The Roanoke radar (KFCX), 73 km from the middle of the area, began a volume at 00:26 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
Aug 25, 8:25 PM EDT	TSTM WND DMG	4 Ese Galax City, VA	TREE DOWN ON APRICOT LANE

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 00:00Z, 0.4 hours before the alert went out and 101 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: 452 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1677 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

817 
WUUS51 KRNK 260023
SVRRNK
NCC171-VAC035-077-260115-
/O.NEW.KRNK.SV.W.0521.110826T0023Z-110826T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
823 PM EDT THU AUG 25 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN SURRY COUNTY IN NORTH CENTRAL NORTH CAROLINA
  SOUTHEASTERN GRAYSON COUNTY IN SOUTHWEST VIRGINIA
  SOUTHERN CARROLL COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 915 PM EDT.

* AT 820 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  LAMBSBURG...OR 7 MILES SOUTHWEST OF FANCY GAP...AND MOVING SOUTH AT
  15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LAMBSBURG...
  CANA...
  LOW GAP...
  BOTTOM...
  WHITE PLAINS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...
DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN.

LARGE HAIL AND...OR STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.
IN ADDITION...TORRENTIAL RAINS MAY FLOOD LOW LYING AREAS SUCH AS
DITCHES AND UNDERPASSES. DO NOT DRIVE INTO AREAS WHERE WATER COVERS
THE ROAD!

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.

&&

LAT...LON 3643 8094 3655 8092 3656 8090 3656 8092
      3658 8092 3668 8089 3669 8088 3668 8064
      3642 8062
TIME...MOT...LOC 0023Z 353DEG 15KT 3660 8079

$$

SK

2 follow-up statements

372 
WWUS51 KRNK 260048
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
848 PM EDT THU AUG 25 2011

NCC171-VAC035-077-260115-
/O.CON.KRNK.SV.W.0521.000000T0000Z-110826T0115Z/
SURRY NC-GRAYSON VA-CARROLL VA-
848 PM EDT THU AUG 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR NORTHWESTERN SURRY...SOUTHEASTERN GRAYSON AND SOUTHERN CARROLL
COUNTIES...

AT 844 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR PIPERS GAP...OR 6 MILES SOUTHEAST OF GALAX CITY...MOVING
SOUTH AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  PIPERS GAP...
  LOW GAP...
  BOTTOM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING. IN ADDITION...TORRENTIAL RAINS MAY FLOOD LOW 
LYING AREAS SUCH AS DITCHES AND UNDERPASSES. TURN AROUND DONT DROWN!

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.

&&

LAT...LON 3643 8094 3653 8092 3655 8091 3656 8090
      3656 8092 3666 8088 3663 8066 3642 8066
TIME...MOT...LOC 0048Z 015DEG 13KT 3658 8086

$$

SK

489 
WWUS51 KRNK 260102
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
902 PM EDT THU AUG 25 2011

NCC171-VAC035-077-260112-
/O.CAN.KRNK.SV.W.0521.000000T0000Z-110826T0115Z/
SURRY NC-GRAYSON VA-CARROLL VA-
902 PM EDT THU AUG 25 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SURRY...
SOUTHEASTERN GRAYSON AND SOUTHERN CARROLL COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW 
SEVERE THRESHOLDS. THEREFORE...THE WARNING HAS BEEN CANCELLED.

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

LAT...LON 3643 8094 3653 8092 3655 8091 3656 8090
      3656 8092 3666 8088 3663 8066 3642 8066
TIME...MOT...LOC 0102Z 015DEG 13KT 3653 8088

$$

SK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 8:35 PM EDT	Areal Flood Advisory	RNK	Carroll	3 hr
Aug 25, 8:37 PM EDT	Special Weather Statement	RNK	Appomattox, Campbell	38 min
Aug 25, 8:46 PM EDT	Special Weather Statement	RNK	City of Martinsville	44 min
Aug 25, 8:58 PM EDT	Special Weather Statement	RNK	Campbell	47 min
Aug 25, 9:11 PM EDT	Special Weather Statement	RNK	Henry	49 min
Aug 25, 10:19 PM EDT	Special Weather Statement	RNK	Halifax	41 min
Aug 25, 10:47 PM EDT	Special Weather Statement	RNK	Carroll, City of Galax	58 min
Aug 26, 12:18 AM EDT	Areal Flood Advisory	RNK	Carroll, Grayson, Patrick, City of Galax	6 hr
Aug 26, 12:58 AM EDT	Flash Flood Warning	RNK	Carroll, Grayson, Patrick, City of Galax	4 hr
Aug 25, 10:50 PM EDT	Special Weather Statement	RNK	Caswell	55 min
Aug 25, 11:24 PM EDT	Special Weather Statement	RNK	Surry, Yadkin	66 min
Aug 26, 7:50 PM EDT	Special Weather Statement	RNK	Ashe	55 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2011 Severe Thunderstorm Warnings in North Carolina, 2011 Every severe thunderstorm warning in 2011

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.