Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 154, NWS Blacksburg, VA

August 12, 20215 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 12, 2021, 2:12 PM EDT for 5 counties in Virginia. It was in force for 63 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: Aug 12, 2021, 2:12 PM EDT (18:12 UTC)
Expired: Aug 12, 2021, 3:15 PM EDT
In force: 63 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bedford County, VA, Campbell County, VA, Franklin County, VA, Pittsylvania County, VA, Roanoke County, VA

The radar

The Roanoke radar (KFCX), 64 km from the middle of the area, began a volume at 18:13 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 12, 2:59 PM EDT	TSTM WND DMG	5 Sw Moneta, VA	MULTIPLE TREES DOWN NORTH OF THE WESTLAKE CORNER AREA.

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, 6.2 hours before the alert went out and 11 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: 75 J/kg
Mixed-layer CIN: -176 J/kg
Mixed-layer LCL: 1340 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

488 
WUUS51 KRNK 121812
SVRRNK
VAC019-031-067-143-161-121915-
/O.NEW.KRNK.SV.W.0154.210812T1812Z-210812T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
212 PM EDT Thu Aug 12 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  East central Roanoke County in west central Virginia...
  Western Campbell County in central Virginia...
  Northwestern Pittsylvania County in south central Virginia...
  Southwestern Bedford County in south central Virginia...
  Northeastern Franklin County in west central Virginia...

* Until 315 PM EDT.

* At 212 PM EDT, a severe thunderstorm was located over
  Stewartsville, moving southeast at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Vinton...
  Stewartsville...
  Huddleston...
  Moneta...
  Penhook...
  Leesville...
  and Northwest Smith Mountain Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds, as well as
deadly cloud to ground lightning. For your safety, move to an
interior room on the lowest floor of a sturdy building. Stay away
from windows.

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 3691 7959 3723 7992 3736 7978 3716 7937
      3712 7934 3711 7933
TIME...MOT...LOC 1812Z 314DEG 19KT 3723 7977 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

3 follow-up statements

446 
WWUS51 KRNK 121835
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
235 PM EDT Thu Aug 12 2021

VAC161-121845-
/O.CAN.KRNK.SV.W.0154.000000T0000Z-210812T1915Z/
Roanoke VA-
235 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
EAST CENTRAL ROANOKE COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. A Severe Thunderstorm Warning remains in effect 
until 315 PM EDT for western Campbell. northwestern Pittsylvania, 
southwestern Bedford, and northeastern Franklin counties until 315 
PM EDT. 

LAT...LON 3691 7959 3720 7989 3721 7988 3721 7985
      3724 7984 3733 7971 3713 7934 3712 7934
TIME...MOT...LOC 1835Z 332DEG 17KT 3717 7973 

$$

VAC019-031-067-143-121915-
/O.CON.KRNK.SV.W.0154.000000T0000Z-210812T1915Z/
Campbell VA-Pittsylvania VA-Bedford VA-Franklin VA-
235 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR
WESTERN CAMPBELL...NORTHWESTERN PITTSYLVANIA...SOUTHWESTERN BEDFORD
AND NORTHEASTERN FRANKLIN COUNTIES...

At 235 PM EDT, a severe thunderstorm was located over Northwest Smith
Mountain Lake, or near Moneta, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Stewartsville...
Huddleston...
Moneta...
Penhook...
Leesville...
Northwest Smith Mountain Lake...
and Goodview.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Smith Mountain Lake, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

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 3691 7959 3720 7989 3721 7988 3721 7985
      3724 7984 3733 7971 3713 7934 3712 7934
TIME...MOT...LOC 1835Z 332DEG 17KT 3717 7973 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

673 
WWUS51 KRNK 121853
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
253 PM EDT Thu Aug 12 2021

VAC031-121901-
/O.CAN.KRNK.SV.W.0154.000000T0000Z-210812T1915Z/
Campbell VA-
253 PM EDT Thu Aug 12 2021

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


LAT...LON 3691 7959 3717 7986 3718 7985 3728 7961
      3708 7943 3706 7944 3706 7941
TIME...MOT...LOC 1851Z 330DEG 16KT 3713 7970 

$$

VAC019-067-143-121915-
/O.CON.KRNK.SV.W.0154.000000T0000Z-210812T1915Z/
Pittsylvania VA-Bedford VA-Franklin VA-
253 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT 
FOR NORTHWESTERN PITTSYLVANIA...SOUTHWESTERN BEDFORD AND 
NORTHEASTERN FRANKLIN COUNTIES...

At 251 PM EDT, a severe thunderstorm was located over Westlake
Corner, or near Moneta, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Moneta...
Penhook...
Smith Mountain Lake State Park...
Union Hall...
Northwest Smith Mountain Lake...
Goodview...
and North Shore.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Smith Mountain Lake, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

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 3691 7959 3717 7986 3718 7985 3728 7961
      3708 7943 3706 7944 3706 7941
TIME...MOT...LOC 1851Z 330DEG 16KT 3713 7970 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

268 
WWUS51 KRNK 121912
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
312 PM EDT Thu Aug 12 2021

VAC019-067-143-121922-
/O.EXP.KRNK.SV.W.0154.000000T0000Z-210812T1915Z/
Pittsylvania VA-Bedford VA-Franklin VA-
312 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
NORTHWESTERN PITTSYLVANIA...SOUTHWESTERN BEDFORD AND NORTHEASTERN
FRANKLIN COUNTIES WILL EXPIRE AT 315 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

LAT...LON 3691 7959 3717 7986 3718 7985 3728 7961
      3708 7943 3706 7944 3706 7941
TIME...MOT...LOC 1912Z 314DEG 19KT 3706 7961 

$$

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 9:54 AM EDT	Heat Advisory	RNK	Buckingham	9 hr
Aug 12, 12:28 PM EDT	Special Weather Statement	RNK	Grayson	32 min
Aug 12, 1:04 PM EDT	Special Weather Statement	RNK	Roanoke, City of Roanoke, City of Salem	26 min
Aug 12, 1:17 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Franklin, Roanoke, City of Roanoke, City of Salem	38 min
Aug 12, 1:30 PM EDT	Special Weather Statement	RNK	Alleghany	30 min
Aug 12, 2:03 PM EDT	Special Weather Statement	RNK	City of Roanoke	27 min
Aug 12, 2:09 PM EDT	Special Weather Statement	RNK	Pittsylvania	36 min
Aug 12, 2:15 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	30 min
Aug 12, 2:24 PM EDT	Special Weather Statement	RNK	Henry	36 min
Aug 12, 2:57 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick	51 min
Aug 12, 3:18 PM EDT	Severe Thunderstorm Warning	RNK	Franklin	29 min
Aug 12, 3:27 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Wythe	48 min
Aug 12, 3:34 PM EDT	Special Weather Statement	RNK	City of Lexington	26 min
Aug 12, 3:37 PM EDT	Severe Thunderstorm Warning	RNK	Craig, Montgomery, Roanoke	53 min
Aug 12, 3:43 PM EDT	Severe Thunderstorm Warning	RNK	Franklin	32 min
Aug 12, 3:51 PM EDT	Special Weather Statement	RNK	Patrick	24 min
Aug 12, 3:58 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	47 min
Aug 12, 4:14 PM EDT	Special Weather Statement	RNK	City of Salem	31 min
Aug 12, 4:14 PM EDT	Special Weather Statement	RNK	City of Salem	31 min
Aug 12, 4:16 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Patrick	29 min
Aug 12, 4:20 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Roanoke	27 min
Aug 12, 4:24 PM EDT	Special Weather Statement	RNK	Floyd	36 min
Aug 12, 4:26 PM EDT	Special Weather Statement	RNK	Grayson	34 min
Aug 12, 4:44 PM EDT	Special Weather Statement	RNK	City of Danville	31 min
Aug 12, 4:49 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Patrick	35 min
Aug 12, 7:42 PM EDT	Heat Advisory	RNK	Appomattox, Buckingham, Campbell, Charlotte, City of Lynchburg	23 hr

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.