Alert archive / Virginia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Blacksburg, VA

March 15, 2012Grayson County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Mar 15, 2012, 2:56 PM EDT for Grayson County, Virginia. It was in force for 49 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: Mar 15, 2012, 2:56 PM EDT (18:56 UTC)
Expired: Mar 15, 2012, 3:45 PM EDT
In force: 49 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

County Grayson County, VA

The radar

The Roanoke radar (KFCX), 91 km from the middle of the area, began a volume at 18:58 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

Time	Report	Where	Remark
Mar 15, 3:11 PM EDT	HAIL 0.75	3 Nw Independence, VA
Mar 15, 3:28 PM EDT	HAIL 1	5 Nne Mouth Of Wilson, VA	HAIL UP TO THE SIZE OF QUARTERS COVERED THE GROUND ON IRONGATE 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 12:00Z, 6.9 hours before the alert went out and 134 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: 3 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 2031 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 29 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.

105 
WUUS51 KRNK 151856
SVRRNK
VAC077-151945-
/O.NEW.KRNK.SV.W.0021.120315T1856Z-120315T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
256 PM EDT THU MAR 15 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRAYSON COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 345 PM EDT.

* AT 254 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
  BRIDLE CREEK...OR 7 MILES NORTHWEST OF INDEPENDENCE...AND MOVING
  EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BRIDLE CREEK...
  ELK CREEK...
  SPRING VALLEY...

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.

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 3677 8115 3677 8109 3678 8109 3681 8105
      3665 8096 3658 8086 3657 8141 3658 8141
      3658 8149 3661 8153
TIME...MOT...LOC 1857Z 249DEG 17KT 3667 8124

$$

3 follow-up statements

413 
WWUS51 KRNK 151915
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
315 PM EDT THU MAR 15 2012

VAC077-151945-
/O.CON.KRNK.SV.W.0021.000000T0000Z-120315T1945Z/
GRAYSON VA-
315 PM EDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR GRAYSON COUNTY...

AT 311 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER
SIZE HAIL.  THIS STORM WAS LOCATED NEAR BRIDLE CREEK...
MOVING SOUTHEAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  BRIDLE CREEK...
  INDEPENDENCE...
  BAYWOOD...

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.

&&

LAT...LON 3677 8115 3677 8109 3681 8105 3665 8096
      3658 8086 3658 8120 3657 8140 3658 8141
      3658 8149 3661 8153
TIME...MOT...LOC 1915Z 294DEG 11KT 3663 8120

$$

PH

501 
WWUS51 KRNK 151929
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
329 PM EDT THU MAR 15 2012

VAC077-151945-
/O.CON.KRNK.SV.W.0021.000000T0000Z-120315T1945Z/
GRAYSON VA-
329 PM EDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR GRAYSON COUNTY...

AT 324 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER
SIZE HAIL.  THIS STORM WAS LOCATED NEAR BRIDLE CREEK...MOVING 
SOUTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  BRIDLE CREEK...
  INDEPENDENCE...

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.

&&

LAT...LON 3663 8145 3672 8114 3658 8100 3657 8139
      3658 8142
TIME...MOT...LOC 1929Z 303DEG 16KT 3663 8128

$$

167 
WWUS51 KRNK 151941
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
341 PM EDT THU MAR 15 2012

VAC077-151951-
/O.EXP.KRNK.SV.W.0021.000000T0000Z-120315T1945Z/
GRAYSON VA-
341 PM EDT THU MAR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR GRAYSON COUNTY EXPIRES AT 345
PM 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.

LAT...LON 3663 8145 3672 8114 3658 8100 3657 8139
      3658 8142
TIME...MOT...LOC 1941Z 303DEG 16KT 3660 8122

$$

PH

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 15, 12:07 PM EDT	Special Weather Statement	RNK	Bland, Smyth, Tazewell	53 min
Mar 15, 1:04 PM EDT	Special Weather Statement	RNK	Wythe	56 min
Mar 15, 2:14 PM EDT	Special Weather Statement	RNK	Carroll, Wythe, City of Galax	61 min
Mar 15, 2:38 PM EDT	Special Weather Statement	RNK	Patrick	67 min
Mar 15, 3:33 PM EDT	Special Weather Statement	RNK	Tazewell	57 min
Mar 15, 4:14 PM EDT	Special Weather Statement	RNK	Bland, Smyth	61 min
Mar 15, 4:41 PM EDT	Special Weather Statement	RNK	Bland, Giles, Grayson, Pulaski, Smyth, Wythe and 2 more	64 min
Mar 15, 5:12 PM EDT	Special Weather Statement	RNK	Carroll, Floyd, Grayson, Montgomery, Wythe, City of Galax and 1 more	63 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.