Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 147, NWS Blacksburg, VA

August 11, 2021Wilkes County, Yadkin County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 2021, 3:27 PM EDT for Wilkes County, Yadkin County, North Carolina. It was in force for 33 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, 3:27 PM EDT (19:27 UTC)
Expired: Aug 11, 2021, 4:00 PM EDT
In force: 33 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Wilkes County, NC, Yadkin County, NC

The radar

The Roanoke radar (KFCX), 120 km from the middle of the area, began a volume at 19:31 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, 3:35 PM EDT	TSTM WND DMG	2 Sw Clingman, NC	A HALF A DOZEN TREES DOWN ON AND AROUND HIGHWAY 421 NEAR WILKES-YADKIN ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.5 hours before the alert went out and 101 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: 653 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1352 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

837 
WUUS51 KRNK 111927
SVRRNK
NCC193-197-112030-
/O.NEW.KRNK.SV.W.0147.210811T1927Z-210811T2030Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Southeastern Wilkes County in northwestern North Carolina...
  Southwestern Yadkin County in northwestern North Carolina...

* Until 430 PM EDT.

* At 326 PM EDT, a severe thunderstorm was located near Windy Gap, or
  near North Wilkesboro, moving northeast at 5 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...
  North Wilkesboro...
  Wilkesboro...
  Ronda...
  Windy Gap...
  Wilkes County Airport...
  Clingman...
  and Roaring River.

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.

Locally heavy rain will quickly reduce visibility and result in
ponding of water on roadways, standing water in low lying areas, and
minor flooding of creeks, streams, and areas of poor drainage.
Drivers are urged to slow down and use extra caution to avoid
hydroplaning.

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 3617 8116 3632 8100 3605 8080 3606 8098
      3604 8106
TIME...MOT...LOC 1926Z 240DEG 5KT 3615 8105 

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

$$

SH

1 follow-up statement

265 
WWUS51 KRNK 112000
SVSRNK

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

NCC193-197-112010-
/O.CAN.KRNK.SV.W.0147.000000T0000Z-210811T2030Z/
Wilkes NC-Yadkin NC-
400 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
SOUTHEASTERN WILKES AND SOUTHWESTERN YADKIN COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southwestern Virginia.

LAT...LON 3617 8116 3632 8100 3605 8080 3606 8098
      3604 8106
TIME...MOT...LOC 1957Z 240DEG 5KT 3617 8100 

$$

SH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 2:17 PM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry	58 min
Aug 11, 2:25 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Surry, Wilkes, Yadkin	65 min
Aug 11, 2:53 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham	67 min
Aug 11, 3:05 PM EDT	Areal Flood Advisory	RNK	Alleghany, Wilkes	3 hr
Aug 11, 3:09 PM EDT	Special Weather Statement	RNK	Stokes	36 min
Aug 11, 3:31 PM EDT	Special Weather Statement	RNK	Yadkin	29 min
Aug 11, 3:46 PM EDT	Severe Thunderstorm Warning	RNK	Yadkin	47 min
Aug 11, 4:07 PM EDT	Special Weather Statement	RNK	Yadkin	38 min
Aug 11, 4:39 PM EDT	Areal Flood Advisory	RNK	Yadkin	3 hr

Nearby

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.