Alert archive / Virginia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 75, NWS Blacksburg, VA

May 1, 2012Franklin County, Henry County, Pittsylvania County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at May 1, 2012, 3:02 PM EDT for Franklin County, Henry County, Pittsylvania County, Virginia. It was in force for 58 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: May 1, 2012, 3:02 PM EDT (19:02 UTC)
Expired: May 1, 2012, 4:00 PM EDT
In force: 58 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Franklin County, VA, Henry County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 64 km from the middle of the area, began a volume at 19:01 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
May 1, 3:25 PM EDT	TSTM WND DMG	1 Sw Chatham, VA	MULTIPLE TREES DOWN ON BEVERLY HEIGHTS RD

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

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 7.0 hours before the alert went out and 33 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: 660 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 496 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

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

525 
WUUS51 KRNK 011902
SVRRNK
VAC067-089-143-012000-
/O.NEW.KRNK.SV.W.0075.120501T1902Z-120501T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
302 PM EDT TUE MAY 1 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL PITTSYLVANIA COUNTY IN SOUTH CENTRAL VIRGINIA
  NORTHEASTERN HENRY COUNTY IN SOUTH CENTRAL VIRGINIA
  SOUTHERN FRANKLIN COUNTY IN WEST CENTRAL VIRGINIA

* UNTIL 400 PM EDT.

* AT 301 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED
  NEAR SNOW CREEK...OR 7 MILES SOUTHWEST OF PENHOOK...AND MOVING EAST
  AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SNOW CREEK...
  CALLANDS...
  CLIMAX...
  CHATHAM...
  DRY FORK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3682 7983 3689 7982 3682 7960 3702 7957
      3702 7949 3701 7948 3702 7947 3700 7929
      3671 7935
TIME...MOT...LOC 1902Z 283DEG 27KT 3689 7967

$$

3 follow-up statements

908 
WWUS51 KRNK 011911
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
311 PM EDT TUE MAY 1 2012

VAC067-089-143-012000-
/O.CON.KRNK.SV.W.0075.000000T0000Z-120501T2000Z/
PITTSYLVANIA VA-HENRY VA-FRANKLIN VA-
311 PM EDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR CENTRAL PITTSYLVANIA...NORTHEASTERN HENRY AND SOUTHERN FRANKLIN
COUNTIES...

AT 306 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR CALLANDS...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  CALLANDS...
  CLIMAX...
  CHATHAM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING HAIL IN ROCKY MOUNT. 
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS!

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 900 PM EDT
TUESDAY EVENING FOR NORTHWESTERN NORTH CAROLINA AND SOUTHWESTERN
VIRGINIA.

&&

LAT...LON 3682 7983 3689 7982 3682 7960 3702 7957
      3702 7949 3701 7948 3702 7947 3700 7929
      3671 7935
TIME...MOT...LOC 1911Z 282DEG 30KT 3687 7954

$$

918 
WWUS51 KRNK 011929
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
329 PM EDT TUE MAY 1 2012

VAC067-089-143-012000-
/O.CON.KRNK.SV.W.0075.000000T0000Z-120501T2000Z/
PITTSYLVANIA VA-HENRY VA-FRANKLIN VA-
329 PM EDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR CENTRAL PITTSYLVANIA...NORTHEASTERN HENRY AND SOUTHERN FRANKLIN
COUNTIES...

AT 324 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR CHATHAM...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  CHATHAM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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 900 PM EDT
TUESDAY EVENING FOR NORTHWESTERN NORTH CAROLINA AND SOUTHWESTERN
VIRGINIA.

&&

LAT...LON 3682 7983 3689 7982 3682 7960 3702 7957
      3702 7949 3701 7948 3702 7947 3700 7929
      3671 7935
TIME...MOT...LOC 1930Z 282DEG 30KT 3684 7935

$$

559 
WWUS51 KRNK 012000
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
400 PM EDT TUE MAY 1 2012

VAC067-089-143-012010-
/O.EXP.KRNK.SV.W.0075.000000T0000Z-120501T2000Z/
PITTSYLVANIA VA-HENRY VA-FRANKLIN VA-
400 PM EDT TUE MAY 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL PITTSYLVANIA...
NORTHEASTERN HENRY AND SOUTHERN FRANKLIN COUNTIES EXPIRES AT 400 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHWESTERN NORTH CAROLINA AND SOUTHWESTERN
VIRGINIA.

LAT...LON 3682 7983 3689 7982 3682 7960 3702 7957
      3702 7949 3701 7948 3702 7947 3700 7929
      3671 7935
TIME...MOT...LOC 2000Z 282DEG 30KT 3679 7904

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 9:59 PM EDT	Dense Fog Advisory	RNK	Amherst, Bedford, Botetourt, Campbell, Roanoke, Rockbridge and 5 more	9 hr
Apr 30, 11:19 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	56 min
May 1, 2:57 AM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	63 min
May 1, 2:58 AM EDT	Special Weather Statement	RNK	Alleghany, Bath, City of Covington	62 min
May 1, 3:44 AM EDT	Special Weather Statement	RNK	Bath	61 min
May 1, 4:45 AM EDT	Special Weather Statement	RNK	Amherst, City of Buena Vista, City of Lexington	60 min
May 1, 4:49 AM EDT	Special Weather Statement	RNK	Bedford, City of Lynchburg	56 min
May 1, 5:46 AM EDT	Special Weather Statement	RNK	Franklin, Pittsylvania	59 min
May 1, 12:34 PM EDT	Special Weather Statement	RNK	Tazewell	41 min
May 1, 12:39 PM EDT	Special Weather Statement	RNK	Bland	51 min
May 1, 1:52 PM EDT	Special Weather Statement	RNK	Floyd, Montgomery, Pulaski, City of Radford	53 min
May 1, 2:12 PM EDT	Special Weather Statement	RNK	Pittsylvania	33 min
May 1, 2:19 PM EDT	Special Weather Statement	RNK	Franklin	26 min
May 1, 2:27 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Floyd, Franklin, Pittsylvania	63 min
May 1, 3:14 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania	76 min
May 1, 3:28 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Henry, Patrick, Pittsylvania, City of Martinsville	62 min
May 1, 3:49 PM EDT	Special Weather Statement	RNK	Tazewell	56 min
May 1, 3:54 PM EDT	Severe Thunderstorm Warning	RNK	Charlotte, Halifax, Pittsylvania	66 min
May 1, 5:50 PM EDT	Special Weather Statement	RNK	Patrick	55 min
May 1, 6:13 PM EDT	Special Weather Statement	RNK	Patrick	32 min
May 1, 6:18 PM EDT	Severe Thunderstorm Warning	RNK	City of Martinsville	35 min
May 1, 7:06 PM EDT	Special Weather Statement	RNK	Henry	54 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.