Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 168, NWS Blacksburg, VA

August 13, 20215 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 13, 2021, 12:40 PM EDT for 5 counties in Virginia. It was in force for 65 min. 3 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 13, 2021, 12:40 PM EDT (16:40 UTC)
Expired: Aug 13, 2021, 1:45 PM EDT
In force: 65 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Roanoke radar (KFCX), 43 km from the middle of the area, began a volume at 16:42 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 13, 12:40 PM EDT	TSTM WND DMG	1 Nne Glenvar, VA	A TREE WAS BLOWN DOWN BY THUNDERSTORM WINDS ALONG STANLEY FARM ROAD.
Aug 13, 12:42 PM EDT	TSTM WND DMG	1 Ssw Cloverdale, VA	A LARGE TREE WAS BLOWN DOWN BY THUNDERSTORM WINDS ALONG CRUTCHFIELD STREET.
Aug 13, 12:56 PM EDT	TSTM WND DMG	1 Se Cloverdale, VA	ONE LARGE TREE WAS BLOWN DOWN BY THUNDERSTORM WINDS, PARTIALLY BLOCKING STAYMAN ROAD.

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, 4.7 hours before the alert went out and 38 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: 1268 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 822 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

832 
WUUS51 KRNK 131640
SVRRNK
VAC023-121-161-770-775-131745-
/O.NEW.KRNK.SV.W.0168.210813T1640Z-210813T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
1240 PM EDT Fri Aug 13 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Roanoke County in west central Virginia...
  The City of Salem in west central Virginia...
  The City of Roanoke in west central Virginia...
  Southwestern Botetourt County in west central Virginia...
  Northeastern Montgomery County in southwestern Virginia...

* Until 145 PM EDT.

* At 1240 PM EDT, a severe thunderstorm was located over Glenvar, or
  near Salem, moving east at 5 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Roanoke...
  Salem...
  Vinton...
  Troutville...
  Hollins...
  Bradshaw...
  and Glenvar.

This includes The following Locations The Salem Fairgrounds and
Roanoke Regional Airport.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for damaging winds. For your safety, move to an
interior room on the lowest floor of a sturdy building. Stay away
from windows.

Locally heavy rain will quickly reduce visibility and result in
ponding of water on roadways, standing water in low lying areas, and
minor flooding of creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3732 7984 3731 7985 3730 7984 3729 7985
      3728 7985 3727 7986 3723 7984 3721 7985
      3721 7988 3720 7989 3719 8027 3734 8028
      3742 7984
TIME...MOT...LOC 1640Z 272DEG 5KT 3727 8016 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

3 follow-up statements

557 
WWUS51 KRNK 131719
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
119 PM EDT Fri Aug 13 2021

VAC121-131727-
/O.CAN.KRNK.SV.W.0168.000000T0000Z-210813T1745Z/
Montgomery VA-
119 PM EDT Fri Aug 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
NORTHEASTERN MONTGOMERY COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened and 
moved out of the warned area. 

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for 
south central, southwestern and west central Virginia.

LAT...LON 3720 8014 3736 8017 3737 8014 3742 7984
      3732 7984 3731 7985 3730 7984 3729 7985
      3728 7985 3727 7986 3723 7984 3721 7985
      3721 7988 3720 7989
TIME...MOT...LOC 1717Z 262DEG 19KT 3728 8004 

$$

VAC023-161-770-775-131745-
/O.CON.KRNK.SV.W.0168.000000T0000Z-210813T1745Z/
Roanoke VA-City of Salem VA-City of Roanoke VA-Botetourt VA-
119 PM EDT Fri Aug 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM EDT 
FOR CENTRAL ROANOKE AND SOUTHWESTERN BOTETOURT COUNTIES...THE CITY 
OF SALEM AND THE CITY OF ROANOKE...

At 117 PM EDT, a severe thunderstorm was located over Salem, moving
east at 20 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated. At 12:50 pm marble size hail was reported 
         by broadcast media via a viewer in the Glenvar area. 

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Roanoke...
Salem...
Vinton...
Troutville...
Glenvar...
Laymantown...
and Hollins.

This includes The following Locations The Salem Fairgrounds and
Roanoke Regional Airport.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for DAMAGING WINDS. For your safety, move to an
interior room on the lowest floor of a sturdy building. Stay away
from windows.

Locally heavy rain will quickly reduce visibility and result in
ponding of water on roadways, standing water in low lying areas, and
minor flooding of creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3720 8014 3736 8017 3737 8014 3742 7984
      3732 7984 3731 7985 3730 7984 3729 7985
      3728 7985 3727 7986 3723 7984 3721 7985
      3721 7988 3720 7989
TIME...MOT...LOC 1717Z 262DEG 19KT 3728 8004 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

944 
WWUS51 KRNK 131735
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
135 PM EDT Fri Aug 13 2021

VAC023-161-770-775-131745-
/O.CON.KRNK.SV.W.0168.000000T0000Z-210813T1745Z/
Roanoke VA-City of Salem VA-City of Roanoke VA-Botetourt VA-
135 PM EDT Fri Aug 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM EDT
FOR
NORTHEASTERN ROANOKE AND SOUTHWESTERN BOTETOURT COUNTIES...THE
EASTERN CITY OF SALEM AND THE CITY OF ROANOKE...

At 135 PM EDT, a severe thunderstorm was located over Roanoke, moving
east at 5 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Roanoke...
Salem...
Vinton...
Troutville...
Laymantown...
Hollins...
and Poages Mill.

This includes The following Locations The Salem Fairgrounds and
Roanoke Regional Airport.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for DAMAGING WINDS. For your safety, move to an
interior room on the lowest floor of a sturdy building. Stay away
from windows.

Locally heavy rain will quickly reduce visibility and result in
ponding of water on roadways, standing water in low lying areas, and
minor flooding of creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3738 8006 3742 7984 3732 7984 3731 7985
      3730 7984 3729 7985 3728 7985 3727 7986
      3723 7984 3721 7985 3721 7988 3720 7989
      3720 8005
TIME...MOT...LOC 1735Z 272DEG 5KT 3728 8001 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

153 
WWUS51 KRNK 131743
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
143 PM EDT Fri Aug 13 2021

VAC023-161-770-775-131753-
/O.EXP.KRNK.SV.W.0168.000000T0000Z-210813T1745Z/
Roanoke VA-City of Salem VA-City of Roanoke VA-Botetourt VA-
143 PM EDT Fri Aug 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
NORTHEASTERN ROANOKE AND SOUTHWESTERN BOTETOURT COUNTIES...THE
EASTERN CITY OF SALEM AND THE CITY OF ROANOKE WILL EXPIRE AT 145 PM
EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
south central, southwestern and west central Virginia.

LAT...LON 3738 8006 3742 7984 3732 7984 3731 7985
      3730 7984 3729 7985 3728 7985 3727 7986
      3723 7984 3721 7985 3721 7988 3720 7989
      3720 8005
TIME...MOT...LOC 1743Z 272DEG 5KT 3728 8000 

$$

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 12:02 PM EDT	Special Weather Statement	RNK	Henry	28 min
Aug 13, 12:21 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	24 min
Aug 13, 12:31 PM EDT	Special Weather Statement	RNK	Roanoke, City of Salem	29 min
Aug 13, 12:51 PM EDT	Special Weather Statement	RNK	Pulaski	24 min
Aug 13, 12:56 PM EDT	Special Weather Statement	RNK	Bath	34 min
Aug 13, 1:06 PM EDT	Special Weather Statement	RNK	Botetourt	24 min
Aug 13, 1:13 PM EDT	Special Weather Statement	RNK	City of Radford	32 min
Aug 13, 1:23 PM EDT	Special Weather Statement	RNK	Botetourt	37 min
Aug 13, 1:31 PM EDT	Special Weather Statement	RNK	Bath	29 min
Aug 13, 1:34 PM EDT	Special Weather Statement	RNK	Roanoke	26 min
Aug 13, 1:45 PM EDT	Special Weather Statement	RNK	Bath	30 min
Aug 13, 1:52 PM EDT	Special Weather Statement	RNK	Montgomery	23 min
Aug 13, 1:59 PM EDT	Special Weather Statement	RNK	Charlotte	31 min
Aug 13, 2:02 PM EDT	Special Weather Statement	RNK	Floyd	28 min
Aug 13, 2:13 PM EDT	Special Weather Statement	RNK	Franklin	32 min
Aug 13, 2:15 PM EDT	Special Weather Statement	RNK	Amherst	30 min
Aug 13, 2:20 PM EDT	Special Weather Statement	RNK	Rockbridge	25 min
Aug 13, 2:21 PM EDT	Special Weather Statement	RNK	Grayson	24 min
Aug 13, 2:25 PM EDT	Special Weather Statement	RNK	Giles	35 min
Aug 13, 2:28 PM EDT	Special Weather Statement	RNK	Pittsylvania	32 min
Aug 13, 2:36 PM EDT	Severe Thunderstorm Warning	RNK	Rockbridge	29 min
Aug 13, 2:40 PM EDT	Special Weather Statement	RNK	Tazewell	35 min
Aug 13, 2:56 PM EDT	Special Weather Statement	RNK	City of Roanoke	34 min
Aug 13, 2:58 PM EDT	Special Weather Statement	RNK	Amherst	32 min
Aug 13, 2:58 PM EDT	Special Weather Statement	RNK	Pittsylvania	32 min
Aug 13, 3:03 PM EDT	Special Weather Statement	RNK	Giles	27 min
Aug 13, 3:09 PM EDT	Special Weather Statement	RNK	Campbell	36 min
Aug 13, 3:11 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania	49 min
Aug 13, 3:45 PM EDT	Special Weather Statement	RNK	Appomattox, Buckingham, Charlotte	60 min
Aug 13, 3:59 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Appomattox, Buckingham	61 min
Aug 13, 4:14 PM EDT	Special Weather Statement	RNK	Halifax	31 min
Aug 13, 4:16 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	29 min
Aug 13, 4:41 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	34 min
Aug 13, 4:55 PM EDT	Severe Thunderstorm Warning	RNK	Buckingham	27 min
Aug 13, 4:57 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bath, City of Covington	47 min
Aug 13, 5:03 PM EDT	Special Weather Statement	RNK	Montgomery	27 min
Aug 13, 5:11 PM EDT	Severe Thunderstorm Warning	RNK	Montgomery	49 min
Aug 13, 5:16 PM EDT	Special Weather Statement	RNK	Charlotte	14 min
Aug 13, 5:20 PM EDT	Special Weather Statement	RNK	Giles, City of Radford	40 min
Aug 13, 5:31 PM EDT	Special Weather Statement	RNK	Charlotte	14 min
Aug 13, 5:38 PM EDT	Special Weather Statement	RNK	Franklin	52 min
Aug 13, 5:56 PM EDT	Special Weather Statement	RNK	Montgomery, Roanoke	34 min
Aug 13, 5:59 PM EDT	Special Weather Statement	RNK	Giles	31 min
Aug 13, 6:02 PM EDT	Special Weather Statement	RNK	Giles	43 min
Aug 13, 6:20 PM EDT	Special Weather Statement	RNK	Botetourt	25 min
Aug 13, 6:26 PM EDT	Special Weather Statement	RNK	Franklin, Roanoke, City of Roanoke, City of Salem	49 min
Aug 13, 6:45 PM EDT	Special Weather Statement	RNK	Craig	45 min
Aug 13, 6:46 PM EDT	Special Weather Statement	RNK	Craig	29 min
Aug 13, 7:11 PM EDT	Special Weather Statement	RNK	Pittsylvania	34 min
Aug 13, 7:13 PM EDT	Special Weather Statement	RNK	Bedford, Botetourt, Craig	47 min
Aug 13, 7:34 PM EDT	Special Weather Statement	RNK	Tazewell	26 min
Aug 13, 7:34 PM EDT	Special Weather Statement	RNK	Appomattox	26 min
Aug 13, 7:36 PM EDT	Special Weather Statement	RNK	Giles	24 min
Aug 13, 7:43 PM EDT	Special Weather Statement	RNK	Bedford	32 min
Aug 13, 7:56 PM EDT	Special Weather Statement	RNK	Bedford, City of Lynchburg	34 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2021 Every severe thunderstorm warning in 2021

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.