Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 97, NWS Blacksburg, VA

July 17, 2021Charlotte County, Halifax County, Pittsylvania County, Virginia; Caswell County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 17, 2021, 10:04 PM EDT for Charlotte County, Halifax County, Pittsylvania County, Virginia; Caswell County, North Carolina. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 17, 2021, 10:04 PM EDT (02:04 UTC)
Expired: Jul 17, 2021, 11:00 PM EDT
In force: 56 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Caswell County, NC, Charlotte County, VA, Halifax County, VA, Pittsylvania County, VA

The radar

The Raleigh/Durham radar (KRAX), 115 km from the middle of the area, began a volume at 02:08 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.

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 2.1 hours before the alert went out and 80 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: 239 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1265 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

564 
WUUS51 KRNK 180204
SVRRNK
NCC033-VAC037-083-143-180300-
/O.NEW.KRNK.SV.W.0097.210718T0204Z-210718T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
1004 PM EDT Sat Jul 17 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Northeastern Caswell County in north central North Carolina...
  Southern Charlotte County in south central Virginia...
  Southeastern Pittsylvania County in south central Virginia...
  Southern Halifax County in south central Virginia...

* Until 1100 PM EDT.

* At 1004 PM EDT, severe thunderstorms were located along a line
  extending from near Alton to near Ringgold, moving northeast at 25
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  South Boston...
  Halifax...
  Turbeville...
  Milton...
  Scottsburg...
  Hitesburg...
  and Cluster Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for 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.

Torrential rainfall is occurring with these storms, 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 3670 7865 3669 7864 3669 7868 3668 7870
      3654 7873 3654 7913 3649 7914 3652 7937
      3657 7933 3657 7930 3661 7936 3682 7895
      3675 7861
TIME...MOT...LOC 0204Z 243DEG 21KT 3650 7899 3657 7934 

HAIL...<.75IN
WIND...60MPH
 
$$

RR

2 follow-up statements

350 
WWUS51 KRNK 180237
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
1037 PM EDT Sat Jul 17 2021

NCC033-VAC143-180247-
/O.CAN.KRNK.SV.W.0097.000000T0000Z-210718T0300Z/
Caswell NC-Pittsylvania VA-
1037 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
NORTHEASTERN CASWELL AND SOUTHEASTERN PITTSYLVANIA COUNTIES IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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 3654 7884 3667 7911 3681 7892 3675 7861
      3670 7865 3669 7864 3669 7868 3668 7870
      3654 7873
TIME...MOT...LOC 0237Z 237DEG 28KT 3654 7872 3667 7899 

$$

VAC037-083-180300-
/O.CON.KRNK.SV.W.0097.000000T0000Z-210718T0300Z/
Charlotte VA-Halifax VA-
1037 PM EDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR
SOUTHERN CHARLOTTE AND SOUTHERN HALIFAX COUNTIES...

At 1037 PM EDT, severe thunderstorms were located along a line
extending from near Virgilina to near Turbeville, moving northeast at
30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
South Boston...
Halifax...
Scottsburg...
Hitesburg...
Cluster Springs...
Staunton River State Park...
and Dryburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for 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.

Torrential rainfall is occurring with these storms, 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 3654 7884 3667 7911 3681 7892 3675 7861
      3670 7865 3669 7864 3669 7868 3668 7870
      3654 7873
TIME...MOT...LOC 0237Z 237DEG 28KT 3654 7872 3667 7899 

HAIL...<.75IN
WIND...60MPH
 
$$

RR

789 
WWUS51 KRNK 180309
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
1109 PM EDT Sat Jul 17 2021

VAC037-083-180319-
/O.EXP.KRNK.SV.W.0097.000000T0000Z-210718T0300Z/
Charlotte VA-Halifax VA-
1109 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CHARLOTTE AND 
SOUTHERN HALIFAX COUNTIES HAS EXPIRED...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has
been allowed to expire.

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 3654 7884 3667 7911 3681 7892 3675 7861
      3670 7865 3669 7864 3669 7868 3668 7870
      3654 7873
TIME...MOT...LOC 0309Z 243DEG 21KT 3661 7850 3674 7877 

$$

KK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:14 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Pittsylvania, City of Martinsville	41 min
Jul 17, 8:42 PM EDT	Severe Thunderstorm Warning	RNK	Henry	63 min
Jul 17, 8:54 PM EDT	Special Weather Statement	RNK	Tazewell	36 min
Jul 17, 10:29 PM EDT	Special Weather Statement	RNK	Bland, Giles, Tazewell	31 min
Jul 18, 2:52 PM EDT	Special Weather Statement	RNK	Patrick	23 min
Jul 18, 3:05 PM EDT	Special Weather Statement	RNK	City of Martinsville	25 min
Jul 18, 3:20 PM EDT	Areal Flood Advisory	RNK	Carroll	83 min
Jul 18, 3:24 PM EDT	Areal Flood Advisory	RNK	Carroll	3 hr
Jul 18, 3:29 PM EDT	Special Weather Statement	RNK	Smyth	31 min
Jul 18, 3:33 PM EDT	Special Weather Statement	RNK	City of Danville	27 min
Jul 18, 3:53 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick	37 min
Jul 18, 4:03 PM EDT	Special Weather Statement	RNK	Smyth	27 min
Jul 18, 4:05 PM EDT	Special Weather Statement	RNK	City of Danville	25 min
Jul 18, 4:09 PM EDT	Special Weather Statement	RNK	Patrick	36 min
Jul 18, 4:12 PM EDT	Areal Flood Advisory	RNK	Carroll, Grayson, City of Galax	112 min
Jul 18, 4:19 PM EDT	Special Weather Statement	RNK	City of Galax	26 min
Jul 18, 4:23 PM EDT	Special Weather Statement	RNK	Henry	37 min
Jul 18, 4:43 PM EDT	Flash Flood Warning	RNK	Carroll	4 hr
Jul 18, 5:11 PM EDT	Special Weather Statement	RNK	Carroll	34 min
Jul 18, 5:38 PM EDT	Special Weather Statement	RNK	Charlotte	37 min
Jul 18, 6:20 PM EDT	Severe Thunderstorm Warning	RNK	Charlotte	40 min
Jul 17, 9:18 PM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	57 min
Jul 18, 2:42 PM EDT	Special Weather Statement	RNK	Ashe	33 min
Jul 18, 3:11 PM EDT	Special Weather Statement	RNK	Wilkes	34 min
Jul 18, 3:36 PM EDT	Special Weather Statement	RNK	Surry	24 min
Jul 18, 3:50 PM EDT	Special Weather Statement	RNK	Surry	25 min
Jul 18, 3:58 PM EDT	Special Weather Statement	RNK	Surry	32 min
Jul 18, 4:27 PM EDT	Special Weather Statement	RNK	Stokes	33 min
Jul 18, 4:53 PM EDT	Special Weather Statement	RNK	Caswell	37 min
Jul 18, 5:06 PM EDT	Special Weather Statement	RNK	Rockingham, Stokes	24 min
Jul 18, 5:30 PM EDT	Special Weather Statement	RNK	Rockingham	30 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2021 Severe Thunderstorm Warnings in North Carolina, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.