Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 148, NWS Blacksburg, VA

August 11, 2021Bedford County, Franklin County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 2021, 3:40 PM EDT for Bedford County, Franklin County, Virginia. It was in force for 34 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 11, 2021, 3:40 PM EDT (19:40 UTC)
Expired: Aug 11, 2021, 4:14 PM EDT
In force: 34 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bedford County, VA, Franklin County, VA

The radar

The Roanoke radar (KFCX), 67 km from the middle of the area, began a volume at 19:40 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, 3:40 PM EDT	TSTM WND DMG	1 Se Moneta, VA	TREES DOWN SOUTH OF MONETA.

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, 7.7 hours before the alert went out and 15 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.

248 
WUUS51 KRNK 111940
SVRRNK
VAC019-067-112045-
/O.NEW.KRNK.SV.W.0148.210811T1940Z-210811T2045Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Southwestern Bedford County in south central Virginia...
  Northeastern Franklin County in west central Virginia...

* Until 445 PM EDT.

* At 340 PM EDT, a severe thunderstorm was located over North Shore,
  or near Moneta, 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...
  Huddleston...
  Moneta...
  Smith Mountain Lake State Park...
  North Shore...
  Westlake Corner...
  and Union Hall.

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 3705 7945 3706 7948 3706 7949 3704 7948
      3702 7946 3702 7950 3705 7954 3703 7957
      3704 7959 3703 7960 3703 7969 3716 7971
      3723 7944 3708 7943
TIME...MOT...LOC 1940Z 259DEG 10KT 3709 7962 

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

$$

SH

1 follow-up statement

624 
WWUS51 KRNK 112014
SVSRNK

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

VAC019-067-112022-
/O.CAN.KRNK.SV.W.0148.000000T0000Z-210811T2045Z/
Bedford VA-Franklin VA-
414 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
SOUTHWESTERN BEDFORD AND NORTHEASTERN FRANKLIN COUNTIES IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. There is another severe 
thunderstorm warning in effect for south central Bedford County 
until 445 PM.

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

LAT...LON 3705 7945 3706 7948 3706 7949 3704 7948
      3702 7946 3702 7950 3705 7954 3703 7957
      3704 7959 3703 7960 3703 7969 3716 7971
      3723 7944 3708 7943
TIME...MOT...LOC 2010Z 259DEG 10KT 3711 7951 

$$

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, 3:18 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Bedford, Campbell, City of Lynchburg	40 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.