Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 144, NWS Blacksburg, VA

August 11, 20214 counties in North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 2021, 2:25 PM EDT for 4 counties in North Carolina. It was in force for 65 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, 2:25 PM EDT (18:25 UTC)
Expired: Aug 11, 2021, 3:30 PM EDT
In force: 65 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Alleghany County, NC, Surry County, NC, Wilkes County, NC, Yadkin County, NC

The radar

The Roanoke radar (KFCX), 102 km from the middle of the area, began a volume at 18:26 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, 3:11 PM EDT	TSTM WND DMG	1 E Roaring River, NC	APPROXIMATELY HALF A DOZEN TREES DOWN AROUND THE RONDA AND ROARING RIVER AREAS.

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, 6.4 hours before the alert went out and 109 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.

525 
WUUS51 KRNK 111825
SVRRNK
NCC005-171-193-197-111930-
/O.NEW.KRNK.SV.W.0144.210811T1825Z-210811T1930Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Eastern Alleghany County in northwestern North Carolina...
  Western Surry County in northwestern North Carolina...
  Northeastern Wilkes County in northwestern North Carolina...
  Northwestern Yadkin County in northwestern North Carolina...

* Until 330 PM EDT.

* At 225 PM EDT, a severe thunderstorm was located over Hays, or near
  North Wilkesboro, moving northeast 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...
  North Wilkesboro...
  Elkin...
  Wilkesboro...
  Fairview...
  Jonesville...
  Dobson...
  and Boonville.

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 3632 8134 3636 8128 3636 8125 3639 8124
      3657 8099 3656 8090 3638 8056 3622 8062
      3612 8118
TIME...MOT...LOC 1825Z 243DEG 11KT 3625 8112 

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

$$

VFJ

2 follow-up statements

116 
WWUS51 KRNK 111838
SVSRNK

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

NCC005-171-193-197-111930-
/O.CON.KRNK.SV.W.0144.000000T0000Z-210811T1930Z/
Alleghany NC-Surry NC-Wilkes NC-Yadkin NC-
238 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR
EASTERN ALLEGHANY...WESTERN SURRY...NORTHEASTERN WILKES AND
NORTHWESTERN YADKIN COUNTIES IN NORTHWESTERN NORTH CAROLINA...

At 238 PM EDT, a severe thunderstorm was located over Dockery, or
near Traphill, moving northeast 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...
North Wilkesboro...
Elkin...
Wilkesboro...
Fairview...
Jonesville...
Dobson...
and Boonville.

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 3632 8134 3636 8128 3636 8125 3639 8124
      3657 8099 3656 8090 3638 8056 3622 8062
      3612 8118
TIME...MOT...LOC 1838Z 243DEG 11KT 3627 8108 

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

$$

VFJ

906 
WWUS51 KRNK 111903
SVSRNK

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

NCC005-171-193-197-111930-
/O.CON.KRNK.SV.W.0144.000000T0000Z-210811T1930Z/
Alleghany NC-Surry NC-Wilkes NC-Yadkin NC-
303 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR
EASTERN ALLEGHANY...WESTERN SURRY...NORTHEASTERN WILKES AND
NORTHWESTERN YADKIN COUNTIES IN NORTHWESTERN NORTH CAROLINA...

At 303 PM EDT, a severe thunderstorm was located near Traphill,
moving northeast 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...
North Wilkesboro...
Elkin...
Wilkesboro...
Fairview...
Jonesville...
Boonville...
and Ronda.

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 3632 8134 3636 8128 3636 8125 3639 8124
      3657 8099 3656 8090 3622 8062 3612 8118
TIME...MOT...LOC 1903Z 243DEG 11KT 3631 8099 

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

$$

VFJ

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, 2:53 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, 3:27 PM EDT	Severe Thunderstorm Warning	RNK	Wilkes, Yadkin	33 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.