Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 146, NWS Blacksburg, VA

August 11, 20214 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 2021, 3:18 PM EDT for 4 counties in Virginia. It was in force for 40 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: Aug 11, 2021, 3:18 PM EDT (19:18 UTC)
Expired: Aug 11, 2021, 3:58 PM EDT
In force: 40 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Amherst County, VA, Bedford County, VA, Campbell County, VA, City of Lynchburg, VA

The radar

The Roanoke radar (KFCX), 93 km from the middle of the area, began a volume at 19:21 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 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, 7.3 hours before the alert went out and 33 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.

510 
WUUS51 KRNK 111918
SVRRNK
VAC009-019-031-680-112015-
/O.NEW.KRNK.SV.W.0146.210811T1918Z-210811T2015Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  North central Campbell County in central Virginia...
  Northeastern Bedford County in south central Virginia...
  Central Amherst County in central Virginia...
  The City of Lynchburg in central Virginia...

* Until 415 PM EDT.

* At 317 PM EDT, a severe thunderstorm was located over Big Island,
  moving east at 10 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...
  Lynchburg...
  Amherst...
  Big Island...
  Forest...
  Coleman Falls...
  Madison Heights...
  and Boonsboro.

This includes The following Locations Liberty University and
Lynchburg 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 3732 7919 3740 7958 3749 7957 3750 7955
      3749 7955 3750 7953 3752 7950 3754 7950
      3755 7946 3757 7944 3758 7944 3770 7905
      3738 7903
TIME...MOT...LOC 1917Z 261DEG 10KT 3752 7939 

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

$$

VFJ

1 follow-up statement

807 
WWUS51 KRNK 111958
SVSRNK

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

VAC009-019-031-680-112008-
/O.CAN.KRNK.SV.W.0146.000000T0000Z-210811T2015Z/
Campbell VA-Bedford VA-Amherst VA-City of Lynchburg VA-
358 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
NORTH CENTRAL CAMPBELL...NORTHEASTERN BEDFORD...AND CENTRAL AMHERST
COUNTIES AND THE CITY OF LYNCHBURG IS CANCELLED...
                
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 has been cancelled.

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

LAT...LON 3732 7919 3740 7958 3749 7957 3750 7955
      3749 7955 3750 7953 3752 7950 3754 7950
      3755 7946 3757 7944 3758 7944 3770 7905
      3738 7903
TIME...MOT...LOC 1955Z 261DEG 10KT 3754 7925 

$$

SH

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, 2:16 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Botetourt, Craig, Franklin, Montgomery, Roanoke and 2 more	59 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, 3:40 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.