Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 175, NWS Blacksburg, VA

August 13, 2021Montgomery County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 13, 2021, 5:11 PM EDT for Montgomery County, Virginia. It was in force for 49 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, 5:11 PM EDT (21:11 UTC)
Expired: Aug 13, 2021, 6:00 PM EDT
In force: 49 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Montgomery County, VA

The radar

The Roanoke radar (KFCX), 18 km from the middle of the area, began a volume at 21:12 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, 5:20 PM EDT	TSTM WND DMG	1 Ssw Christiansburg, VA	A TREE WAS BLOWN DOWN BY THUNDERSTORM WINDS NEAR THE INTERSECTION OF 1ST STREET AND CHRISMAN STREET.
Aug 13, 5:20 PM EDT	TSTM WND DMG	2 Ssw Christiansburg, VA	A TREE WAS BLOWN DOWN ON TOP OF A VEHICLE NEAR THE INTERSECTION OF GROVE AVENUE AND WEST MAIN STREET.
Aug 13, 5:21 PM EDT	TSTM WND DMG	1 Wsw Christiansburg, VA	A TREE WAS BLOWN DOWN BY THUNDERSTORM WINDS ALONG WADES LANE.

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, 9.2 hours before the alert went out and 83 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.

277 
WUUS51 KRNK 132111
SVRRNK
VAC121-132200-
/O.NEW.KRNK.SV.W.0175.210813T2111Z-210813T2200Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Montgomery County in southwestern Virginia...

* Until 600 PM EDT.

* At 511 PM EDT, a severe thunderstorm was located near Childress, or
  near Christiansburg, moving northeast 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...
  Blacksburg...
  Christiansburg...
  Radford...
  Pilot...
  Shawsville...
  Mc Donalds Mill...
  and Merrimac.

This includes The following Location Virginia Tech.
 
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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

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 3709 8058 3712 8055 3711 8053 3714 8051
      3716 8054 3733 8041 3737 8033 3734 8027
      3730 8026 3723 8019 3716 8018 3702 8035
      3701 8040 3702 8042 3701 8042 3702 8045
      3699 8048 3704 8055 3705 8057 3705 8055
TIME...MOT...LOC 2111Z 216DEG 17KT 3708 8046 

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

$$

RR

3 follow-up statements

260 
WWUS51 KRNK 132140
SVSRNK

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

VAC121-132200-
/O.CON.KRNK.SV.W.0175.000000T0000Z-210813T2200Z/
Montgomery VA-
540 PM EDT Fri Aug 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR
MONTGOMERY COUNTY...

At 540 PM EDT, a severe thunderstorm was located over Christiansburg,
moving northeast 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...
Blacksburg...
Christiansburg...
Pilot...
Shawsville...
Mc Donalds Mill...
Elliston-Lafayette...
and Merrimac.

This includes The following Location Virginia Tech.
 
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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

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 3710 8052 3714 8050 3733 8041 3737 8033
      3734 8027 3730 8026 3723 8019 3716 8018
      3702 8035 3703 8040 3707 8050
TIME...MOT...LOC 2140Z 222DEG 11KT 3715 8038 

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

$$

RR

241 
WWUS51 KRNK 132150
SVSRNK

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

VAC121-132200-
/O.CON.KRNK.SV.W.0175.000000T0000Z-210813T2200Z/
Montgomery VA-
550 PM EDT Fri Aug 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR
EASTERN MONTGOMERY COUNTY...

At 549 PM EDT, a severe thunderstorm was located over Shawsville,
moving northeast 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...
Blacksburg...
Christiansburg...
Shawsville...
Mc Donalds Mill...
Elliston-Lafayette...
Merrimac...
and Crockett Springs.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

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 3704 8032 3720 8045 3732 8026 3730 8026
      3723 8019 3716 8018
TIME...MOT...LOC 2149Z 237DEG 17KT 3715 8030 

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

$$

RR

180 
WWUS51 KRNK 132156
SVSRNK

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

VAC121-132206-
/O.EXP.KRNK.SV.W.0175.000000T0000Z-210813T2200Z/
Montgomery VA-
556 PM EDT Fri Aug 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
EASTERN MONTGOMERY COUNTY WILL EXPIRE AT 600 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.

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

LAT...LON 3704 8032 3720 8045 3732 8026 3730 8026
      3723 8019 3716 8018
TIME...MOT...LOC 2156Z 216DEG 17KT 3718 8028 

$$

RR

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, 12:40 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt, Montgomery, Roanoke, City of Roanoke, City of Salem	65 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, 5:16 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.