Alert archive / Virginia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 321, NWS Blacksburg, VA

August 1, 2012Botetourt County, Roanoke County, City of Roanoke, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 1, 2012, 6:04 PM EDT for Botetourt County, Roanoke County, City of Roanoke, Virginia. It was in force for 56 min. 10 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: Aug 1, 2012, 6:04 PM EDT (22:04 UTC)
Expired: Aug 1, 2012, 7:00 PM EDT
In force: 56 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Botetourt County, VA, City of Roanoke, VA, Roanoke County, VA

The radar

The Roanoke radar (KFCX), 42 km from the middle of the area, began a volume at 22:07 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 1, 6:20 PM EDT	HAIL 1	5 Nw Roanoke, VA	HAIL RANGING FROM DIME TO QUARTER SIZE NEAR GLEN COVE ELEMENTARY SCHOOL.
Aug 1, 6:25 PM EDT	HAIL 1	4 Nw Roanoke, VA	HAIL RANGED FROM DIME SIZE TO QUARTER SIZE ON GREEN RIDGE ROAD
Aug 1, 6:25 PM EDT	HAIL 1.75	5 Nw Roanoke, VA	GOLF BALL SIZE HAIL REPORTED
Aug 1, 6:32 PM EDT	HAIL 1	2 Nnw Roanoke, VA	QUARTER SIZE HAIL REPORTED AT THE WDBJ STUDIO.
Aug 1, 6:35 PM EDT	HAIL 1.75	4 Nnw Roanoke, VA	GOLF BALL SIZE HAIL ON PETERS CREEK ROAD
Aug 1, 6:38 PM EDT	HAIL 1.75	3 Wnw Roanoke, VA	GOLF BALL SIZE HAIL ON VIRGINIA AVE
Aug 1, 6:38 PM EDT	HAIL 1.75	4 W Roanoke, VA	GOLF BALL SIZE HAIL IN EAST SALEM NEAR THE MEDICAL CENTER
Aug 1, 6:45 PM EDT	HAIL 1.75	3 Sw Roanoke, VA	GOLF BALL SIZE HAIL ON LIVINGSTON ROAD
Aug 1, 6:48 PM EDT	HAIL 1	5 Ssw Roanoke, VA	QUARTER SIZE HAIL ON PINE COURT ROAD
Aug 1, 6:56 PM EDT	HAIL 1	1 Se Roanoke, VA	QUARTER SIZE HAIL ON 3RD STREET SW ACROSS FROM THE CITY COURT HOUSE

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, 10.1 hours before the alert went out and 41 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: 159 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 41 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.

261 
WUUS51 KRNK 012204
SVRRNK
VAC023-161-770-012300-
/O.NEW.KRNK.SV.W.0321.120801T2204Z-120801T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
604 PM EDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ROANOKE COUNTY IN WEST CENTRAL VIRGINIA
  CITY OF ROANOKE IN WEST CENTRAL VIRGINIA
  SOUTHWESTERN BOTETOURT COUNTY IN WEST CENTRAL VIRGINIA

* UNTIL 700 PM EDT.

* AT 603 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
  HOLLINS...OR 6 MILES SOUTHWEST OF TROUTVILLE...AND MOVING SOUTH
  AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HOLLINS...
  ROANOKE...
  VINTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 3735 7979 3732 7985 3723 7984 3721 7989
      3717 7991 3714 7996 3715 7998 3725 8004
      3726 8002 3730 8002 3732 8003 3732 8005
      3740 8006 3744 7996 3744 7994
TIME...MOT...LOC 2204Z 329DEG 10KT 3737 7998

$$

RAB

3 follow-up statements

407 
WWUS51 KRNK 012225
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
625 PM EDT WED AUG 1 2012

VAC023-161-770-012300-
/O.CON.KRNK.SV.W.0321.000000T0000Z-120801T2300Z/
ROANOKE VA-CITY OF ROANOKE VA-BOTETOURT VA-
625 PM EDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR THE CITY OF ROANOKE... EASTERN ROANOKE AND SOUTHWESTERN BOTETOURT
COUNTIES...

AT 620 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 THE ROANOKE AIRPORT...MOVING SOUTHEAST AT 10 MPH TOWARD 
THE DOWNTOWN AREA OF THE CITY OF ROANOKE.

LOCATIONS IMPACTED INCLUDE...
  HOLLINS...
  ROANOKE...
  VINTON...
  ROANOKE MOUNTAIN...
  ROANOKE AIRPORT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERAL REPORTS OF QUARTER-SIZED HAIL HAVE ALREADY BEEN RECEIVED 
FROM THE CITY OF ROANOKE...AND INDICATIONS ARE THAT HAIL LARGER THAN 
QUARTERS MAY BE OCCURRING AT THIS TIME.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...EXCESSIVE 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.

&&

LAT...LON 3739 7990 3732 7985 3726 7985 3723 7984
      3721 7989 3717 7992 3714 7996 3715 7998
      3725 8004 3728 8002 3732 8003 3732 8005
      3740 8006 3742 7997
TIME...MOT...LOC 2223Z 329DEG 10KT 3732 7995

$$

RAB

825 
WWUS51 KRNK 012245
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
645 PM EDT WED AUG 1 2012

VAC023-012253-
/O.CAN.KRNK.SV.W.0321.000000T0000Z-120801T2300Z/
BOTETOURT VA-
645 PM EDT WED AUG 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN BOTETOURT COUNTY
IS CANCELLED...

THE THUNDERSTORM THAT EARLIER PROMPTED THIS WARNING HAS MOVED SOUTH 
INTO ROANOKE COUNTY AND THE CITY OF ROANOKE. SEVERE THUNDERSTORMS 
ARE NO LONGER ANTICIPATED IN BOTETOURT COUNTY AT THIS TIME.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 3732 7985 3726 7985 3723 7984 3721 7989
      3717 7992 3714 7996 3715 7998 3725 8004
      3728 8001 3732 8003 3733 7996
TIME...MOT...LOC 2243Z 329DEG 10KT 3727 7991

$$

VAC161-770-012300-
/O.CON.KRNK.SV.W.0321.000000T0000Z-120801T2300Z/
ROANOKE VA-CITY OF ROANOKE VA-
645 PM EDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR THE CITY OF ROANOKE... SOUTHEASTERN ROANOKE COUNTY...

AT 641 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH.  THIS STORM WAS LOCATED NEAR VINTON...OR NEAR ROANOKE...MOVING
SOUTHEAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  VINTON...
  ROANOKE MOUNTAIN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...EXCESSIVE 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.

&&

LAT...LON 3732 7985 3726 7985 3723 7984 3721 7989
      3717 7992 3714 7996 3715 7998 3725 8004
      3728 8001 3732 8003 3733 7996
TIME...MOT...LOC 2243Z 329DEG 10KT 3727 7991

$$

RAB

402 
WWUS51 KRNK 012308
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
708 PM EDT WED AUG 1 2012

VAC161-770-012314-
/O.EXP.KRNK.SV.W.0321.000000T0000Z-120801T2300Z/
ROANOKE VA-CITY OF ROANOKE VA-
708 PM EDT WED AUG 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR THE CITY OF ROANOKE...
SOUTHEASTERN ROANOKE COUNTY EXPIRED AT 700 PM EDT...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED SOUTH 
INTO FRANKLIN COUNTY. THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE. 
ALLOWED TO EXPIRE. MODERATE TO HEAVY RAIN AND OCCASIONAL 
CLOUD-TO-GROUND LIGHTNING WILL CONTINUE ACROSS SOUTHERN ROANOKE 
COUNTY DURING THE NEXT HALF HOUR. SOME DIME-SIZED HAIL WILL REMAIN 
POSSIBLE AS WELL NEAR THE FRANKLIN COUNTY LINE.

THERE WERE NUMEROUS REPORTS OF QUARTER TO GOLF BALL-SIZED HAIL FROM
ROANOKE COUNTY DURING THE TIME FRAME OF THIS SEVERE THUNDERSTORM. IN 
ADDITION...THERE WERE INDICATIONS OF DAMAGING WIND...ESPECIALLY 
ACROSS THE SOUTHERN PART OF THE COUNTY. IF YOU OBSERVED 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 3732 7985 3726 7985 3723 7984 3721 7989
      3717 7992 3714 7996 3715 7998 3725 8004
      3728 8001 3732 8003 3733 7996
TIME...MOT...LOC 2245Z 329DEG 10KT 3727 7991

$$

RAB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:21 PM EDT	Areal Flood Advisory	RNK	Bath	112 min
Jul 31, 9:00 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	60 min
Jul 31, 9:54 PM EDT	Special Weather Statement	RNK	Giles	66 min
Jul 31, 9:57 PM EDT	Special Weather Statement	RNK	Amherst, Rockbridge, City of Buena Vista, City of Lexington	63 min
Jul 31, 10:20 PM EDT	Severe Thunderstorm Warning	RNK	Craig, Giles, Montgomery	55 min
Jul 31, 10:30 PM EDT	Special Weather Statement	RNK	City of Lynchburg	60 min
Jul 31, 11:00 PM EDT	Special Weather Statement	RNK	Montgomery	45 min
Jul 31, 11:04 PM EDT	Severe Thunderstorm Warning	RNK	Montgomery	56 min
Jul 31, 11:10 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Appomattox, Bedford, Campbell, City of Lynchburg	65 min
Jul 31, 11:35 PM EDT	Special Weather Statement	RNK	Buckingham	55 min
Aug 1, 12:31 AM EDT	Special Weather Statement	RNK	Bedford	29 min
Aug 1, 12:32 AM EDT	Special Weather Statement	RNK	Appomattox, City of Lynchburg	28 min
Aug 1, 12:59 AM EDT	Special Weather Statement	RNK	Campbell	61 min
Aug 1, 1:03 AM EDT	Special Weather Statement	RNK	Appomattox	27 min
Aug 1, 1:04 AM EDT	Special Weather Statement	RNK	Franklin	26 min
Aug 1, 1:31 AM EDT	Special Weather Statement	RNK	Campbell	29 min
Aug 1, 2:08 AM EDT	Special Weather Statement	RNK	Campbell	37 min
Aug 1, 2:09 AM EDT	Special Weather Statement	RNK	Halifax	66 min
Aug 1, 2:10 AM EDT	Special Weather Statement	RNK	Charlotte	20 min
Aug 1, 3:13 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Lexington	62 min
Aug 1, 4:14 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bath, Rockbridge, City of Buena Vista, City of Lexington	61 min
Aug 1, 4:30 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt	60 min
Aug 1, 4:49 PM EDT	Special Weather Statement	RNK	Craig	41 min
Aug 1, 4:53 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Botetourt, Rockbridge	48 min
Aug 1, 5:06 PM EDT	Special Weather Statement	RNK	Floyd	54 min
Aug 1, 5:39 PM EDT	Special Weather Statement	RNK	City of Roanoke	51 min
Aug 1, 6:14 PM EDT	Special Weather Statement	RNK	Botetourt	61 min
Aug 1, 6:29 PM EDT	Severe Thunderstorm Warning	RNK	Roanoke, City of Roanoke, City of Salem	46 min
Aug 1, 6:57 PM EDT	Severe Thunderstorm Warning	RNK	Franklin	46 min
Aug 1, 7:49 PM EDT	Special Weather Statement	RNK	Charlotte	56 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.