Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 142, NWS Blacksburg, VA

August 11, 20218 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 2021, 2:16 PM EDT for 8 counties in Virginia. It was in force for 59 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: Aug 11, 2021, 2:16 PM EDT (18:16 UTC)
Expired: Aug 11, 2021, 3:15 PM EDT
In force: 59 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bedford County, VA, Botetourt County, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Franklin County, VA, Montgomery County, VA, Roanoke County, VA

The radar

The Roanoke radar (KFCX), 32 km from the middle of the area, began a volume at 18:15 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 11, 2:20 PM EDT	TSTM WND DMG	3 N Poages Mill, VA	THUNDERSTORM WINDS BLEW DOWN MULTIPLE 4 INCH-DIAMETER TREE LIMBS.
Aug 11, 2:49 PM EDT	TSTM WND DMG	2 Ne Vinton, VA	TREE DOWN ON STONE CREEK PATH THAT ALSO BROUGHT POWER LINES DOWN WITH IT.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 11, 2:02 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 6.3 hours before the alert went out and 51 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: 506 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 998 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -44 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.

180 
WUUS51 KRNK 111816
SVRRNK
VAC019-023-045-067-121-161-770-775-111915-
/O.NEW.KRNK.SV.W.0142.210811T1816Z-210811T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
216 PM EDT Wed Aug 11 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Roanoke County in west central Virginia...
  South central Craig County in southwestern Virginia...
  The City of Salem in west central Virginia...
  The City of Roanoke in west central Virginia...
  West central Bedford County in south central Virginia...
  Southwestern Botetourt County in west central Virginia...
  North central Franklin County in west central Virginia...
  Northeastern Montgomery County in southwestern Virginia...

* Until 315 PM EDT.

* At 216 PM EDT, a severe thunderstorm was located over Bradshaw, or
  7 miles west of Salem, moving east at 15 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...
  Roanoke...
  Salem...
  Vinton...
  Troutville...
  Boones Mill...
  Stewartsville...
  and Montvale.

This includes The following Locations The Salem Fairgrounds and
Roanoke Regional Airport.
 
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.

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 3722 8031 3740 8027 3743 7970 3707 7978
TIME...MOT...LOC 1816Z 279DEG 12KT 3730 8021 

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

$$

VFJ

3 follow-up statements

974 
WWUS51 KRNK 111827
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
227 PM EDT Wed Aug 11 2021

VAC045-121-111837-
/O.CAN.KRNK.SV.W.0142.000000T0000Z-210811T1915Z/
Craig VA-Montgomery VA-
227 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
SOUTH CENTRAL CRAIG AND NORTHEASTERN MONTGOMERY COUNTIES IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central, south central, southwestern and west central Virginia.

LAT...LON 3707 7978 3720 8019 3723 8019 3726 8022
      3737 8021 3743 7970
TIME...MOT...LOC 1827Z 279DEG 12KT 3729 8016 

$$

VAC019-023-067-161-770-775-111915-
/O.CON.KRNK.SV.W.0142.000000T0000Z-210811T1915Z/
Roanoke VA-City of Salem VA-City of Roanoke VA-Bedford VA-
Botetourt VA-Franklin VA-
227 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR
ROANOKE...WEST CENTRAL BEDFORD...SOUTHWESTERN BOTETOURT AND NORTH
CENTRAL FRANKLIN COUNTIES...THE CITY OF SALEM AND THE CITY OF
ROANOKE...

At 227 PM EDT, a severe thunderstorm was located over Glenvar, or
near Salem, moving east at 15 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...
Roanoke...
Salem...
Vinton...
Troutville...
Stewartsville...
Montvale...
and Catawba.

This includes The following Locations The Salem Fairgrounds and
Roanoke Regional Airport.
 
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.

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 3707 7978 3720 8019 3723 8019 3726 8022
      3737 8021 3743 7970
TIME...MOT...LOC 1827Z 279DEG 12KT 3729 8016 

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

$$

VFJ

807 
WWUS51 KRNK 111839
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
239 PM EDT Wed Aug 11 2021

VAC019-023-067-161-770-775-111915-
/O.CON.KRNK.SV.W.0142.000000T0000Z-210811T1915Z/
Roanoke VA-City of Salem VA-City of Roanoke VA-Bedford VA-
Botetourt VA-Franklin VA-
239 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR
EASTERN ROANOKE...WEST CENTRAL BEDFORD...SOUTHWESTERN BOTETOURT AND
NORTH CENTRAL FRANKLIN COUNTIES...THE CITY OF SALEM AND THE CITY OF
ROANOKE...

At 239 PM EDT, a severe thunderstorm was located over Salem, moving
east at 15 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...
Roanoke...
Salem...
Vinton...
Troutville...
Stewartsville...
Montvale...
and Burnt Chimney.

This includes The following Locations The Salem Fairgrounds and
Roanoke Regional Airport.
 
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.

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 3707 7978 3721 8011 3738 8010 3743 7970
TIME...MOT...LOC 1839Z 279DEG 12KT 3728 8011 

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

$$

VFJ

416 
WWUS51 KRNK 111908
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
308 PM EDT Wed Aug 11 2021

VAC019-023-067-161-770-775-111918-
/O.EXP.KRNK.SV.W.0142.000000T0000Z-210811T1915Z/
Roanoke VA-City of Salem VA-City of Roanoke VA-Bedford VA-
Botetourt VA-Franklin VA-
308 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
EASTERN ROANOKE...WEST CENTRAL BEDFORD...SOUTHWESTERN BOTETOURT AND
NORTH CENTRAL FRANKLIN COUNTIES...THE CITY OF SALEM AND THE CITY OF
ROANOKE 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.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central, south central, southwestern and west central Virginia.

LAT...LON 3707 7978 3721 8011 3738 8010 3743 7970
TIME...MOT...LOC 1908Z 279DEG 12KT 3727 8000 

$$

VFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 2:03 PM EDT	Special Weather Statement	RNK	Patrick	27 min
Aug 11, 2:06 PM EDT	Special Weather Statement	RNK	City of Lynchburg	39 min
Aug 11, 2:09 PM EDT	Special Weather Statement	RNK	Roanoke, City of Roanoke, City of Salem	51 min
Aug 11, 2:17 PM EDT	Severe Thunderstorm Warning	RNK	Patrick	58 min
Aug 11, 2:53 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick, Pittsylvania, City of Martinsville	67 min
Aug 11, 3:01 PM EDT	Special Weather Statement	RNK	Bedford	29 min
Aug 11, 3:13 PM EDT	Special Weather Statement	RNK	Franklin	32 min
Aug 11, 3:18 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Bedford, Campbell, City of Lynchburg	40 min
Aug 11, 3:40 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Franklin	34 min
Aug 11, 3:50 PM EDT	Special Weather Statement	RNK	Franklin	25 min
Aug 11, 4:09 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, Pittsylvania	36 min
Aug 11, 4:43 PM EDT	Special Weather Statement	RNK	Halifax	32 min
Aug 11, 4:58 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania	35 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.