Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 151, NWS Blacksburg, VA

August 11, 2021Halifax County, Pittsylvania County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 2021, 4:58 PM EDT for Halifax County, Pittsylvania County, Virginia. It was in force for 35 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, 4:58 PM EDT (20:58 UTC)
Expired: Aug 11, 2021, 5:33 PM EDT
In force: 35 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Halifax County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 111 km from the middle of the area, began a volume at 20:59 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, 5:05 PM EDT	TSTM WND DMG	3 Ene Mt Airy, VA	SEVERAL TREES DOWN ALONG EAST GRETNA ROAD NEAR ALLEN CREEK ROAD.

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, 9.0 hours before the alert went out and 49 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.

644 
WUUS51 KRNK 112058
SVRRNK
VAC083-143-112145-
/O.NEW.KRNK.SV.W.0151.210811T2058Z-210811T2145Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  East central Pittsylvania County in south central Virginia...
  Northwestern Halifax County in south central Virginia...

* Until 545 PM EDT.

* At 458 PM EDT, a severe thunderstorm was located near Mt Airy,
  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...
  Nathalie...
  Cody...
  Leda...
  and Straightstone.

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 3682 7919 3701 7918 3704 7902 3703 7901
      3705 7898 3705 7897 3704 7897 3704 7894
      3702 7892 3678 7892
TIME...MOT...LOC 2058Z 275DEG 12KT 3692 7914 

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

$$

SH

1 follow-up statement

178 
WWUS51 KRNK 112133
SVSRNK

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

VAC083-143-112143-
/O.CAN.KRNK.SV.W.0151.000000T0000Z-210811T2145Z/
Pittsylvania VA-Halifax VA-
533 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
EAST CENTRAL PITTSYLVANIA AND NORTHWESTERN HALIFAX COUNTIES 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 and south central Virginia.

LAT...LON 3682 7919 3701 7918 3704 7902 3703 7901
      3705 7898 3705 7897 3704 7897 3704 7894
      3702 7892 3678 7892
TIME...MOT...LOC 2131Z 275DEG 12KT 3691 7899 

$$

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, 3:40 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

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.