Alert archive / Virginia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 113, NWS Blacksburg, VA

June 12, 2007Grayson County, Virginia; Alleghany County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Jun 12, 2007, 3:56 PM EDT for Grayson County, Virginia; Alleghany County, North Carolina. It was in force for 58 min. 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
Jun 12, 2007, 3:56 PM EDT (19:56 UTC)
Expired
Jun 12, 2007, 4:54 PM EDT
In force
58 min
Issued by
NWS Blacksburg, VA
Area
Counties, with a storm outline in the text

Counties Alleghany County, NC, Grayson County, VA

The radar

The Roanoke radar (KFCX), 90 km from the middle of the area, began a volume at 19:58 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

TimeReportWhereRemark
Jun 12, 3:58 PM EDTHAIL 0.755 Sw Galax, VANEAR DELHART
Jun 12, 4:20 PM EDTHAIL 0.88Ennice, NC

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 12, 2:23 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.9 hours before the alert went out and 117 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2007-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 473 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2007-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
473 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
0 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.

000 
WUUS51 KRNK 121956
SVRRNK
NCC005-VAC077-122130-
/O.NEW.KRNK.SV.W.0113.070612T1956Z-070612T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
356 PM EDT TUE JUN 12 2007

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALLEGHANY COUNTY IN NORTHWEST NORTH CAROLINA
  SOUTHEASTERN GRAYSON COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 530 PM EDT

* AT 354 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  BAYWOOD...OR ABOUT NEAR ENNICE...AND MOVING SOUTHWEST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BAYWOOD...
  ENNICE...
  SPARTA...
  WHITEHEAD...

PLEASE SEND YOUR REPORTS OF PENNY 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 3657 8089 3666 8097 3654 8132 3639 8124
      3643 8115

$$

RCS
2 follow-up statements
000 
WWUS51 KRNK 122032
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
432 PM EDT TUE JUN 12 2007

VAC077-122036-
/O.CAN.KRNK.SV.W.0113.000000T0000Z-070612T2130Z/
GRAYSON VA-
432 PM EDT TUE JUN 12 2007

...THE SEVERE THUNDERSTORM WARNING FOR GRAYSON COUNTY IS CANCELLED...

STORMS HAVE WEAKENED OR MOVED OUT OF THE COUNTY...THEREFORE THE 
WARNING HAS BEEN CANCELLED FOR GRAYSON COUNTY. HOWEVER...SCATTERED 
THUNDERSTORMS WITH LOCALLY HEAVY RAIN...DANGEROUS LIGHTNING...SMALL 
HAIL...AND WIND GUSTS TO 40 MPH ARE STILL POSSIBLE IN THE SOUTHERN 
PART OF THE COUNTY THROUGH 500 PM.

LAT...LON 3656 8091 3657 8119 3654 8132 3639 8124
      3643 8115

$$

NCC005-122130-
/O.CON.KRNK.SV.W.0113.000000T0000Z-070612T2130Z/
ALLEGHANY NC-
432 PM EDT TUE JUN 12 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR ALLEGHANY COUNTY...

AT 424 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR SPARTA...MOVING SOUTHWEST AT 10 MPH.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. NICKEL SIZE HAIL 
WAS REPORTED IN ENNICE AT 420 PM.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TWIN
OAKS...STRATFORD...WHITEHEAD AND SCOTTVILLE.



LAT...LON 3656 8091 3657 8119 3654 8132 3639 8124
      3643 8115

$$

RCS
000 
WWUS51 KRNK 122054
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
453 PM EDT TUE JUN 12 2007

NCC005-122103-
/O.CAN.KRNK.SV.W.0113.000000T0000Z-070612T2130Z/
ALLEGHANY NC-
453 PM EDT TUE JUN 12 2007

...THE SEVERE THUNDERSTORM WARNING FOR ALLEGHANY COUNTY IS
CANCELLED...

STORMS HAVE WEAKENED OR MOVED OUT OF THE COUNTY...THEREFORE THE 
WARNING HAS BEEN CANCELLED. HOWEVER...SCATTERED THUNDERSTORMS WITH 
LOCALLY HEAVY RAIN...DANGEROUS LIGHTNING...SMALL HAIL...AND WIND 
GUSTS TO 40 MPH ARE STILL POSSIBLE THROUGH 530 PM.

LAT...LON 3656 8091 3657 8119 3654 8132 3639 8124
      3643 8115

$$

RCS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 11, 8:01 PM EDTSevere Thunderstorm WarningRNKBedford44 min
Jun 11, 8:22 PM EDTSevere Thunderstorm WarningRNKFranklin68 min
Jun 12, 4:11 PM EDTSevere Thunderstorm WarningRNKBuckingham80 min
Jun 12, 4:56 PM EDTSevere Thunderstorm WarningRNKAppomattox64 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2007Severe Thunderstorm Warnings in North Carolina, 2007Every severe thunderstorm warning in 2007

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.