Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 155, NWS Blacksburg, VA

August 12, 20216 counties in North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 12, 2021, 2:18 PM EDT for 6 counties in North Carolina. It was in force for 57 min. 3 reports 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 12, 2021, 2:18 PM EDT (18:18 UTC)
Expired: Aug 12, 2021, 3:15 PM EDT
In force: 57 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Roanoke radar (KFCX), 131 km from the middle of the area, began a volume at 18:19 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 12, 2:45 PM EDT	TSTM WND DMG	3 Sse Purlear, NC	NUMEROUS TREES DOWN ALONG 421, TO THE MT.PLEASANT AREA.
Aug 12, 2:45 PM EDT	TSTM WND DMG	6 Nnw Boomer, NC	NUMEROUS TREES DOWN ALONG 421, TO THE MT. PLEASANT AREA.
Aug 12, 2:57 PM EDT	HAIL 1.5	1 Wsw Othello, NC

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, 6.3 hours before the alert went out and 133 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: 1015 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: -15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

458 
WUUS51 KRNK 121818
SVRRNK
NCC005-009-171-189-193-197-121915-
/O.NEW.KRNK.SV.W.0155.210812T1818Z-210812T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
218 PM EDT Thu Aug 12 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Central Alleghany County in northwestern North Carolina...
  Western Surry County in northwestern North Carolina...
  Wilkes County in northwestern North Carolina...
  Southeastern Watauga County in northwestern North Carolina...
  Southeastern Ashe County in northwestern North Carolina...
  Northwestern Yadkin County in northwestern North Carolina...

* Until 315 PM EDT.

* At 217 PM EDT, a severe thunderstorm was located over Wilbar,
  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...
  Boone...
  North Wilkesboro...
  Elkin...
  Wilkesboro...
  Fairview...
  Jonesville...
  and Sparta.

This includes The following Location Appalachian State University.
 
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 3643 8142 3656 8087 3656 8075 3626 8064
      3607 8142 3607 8144 3609 8146 3610 8151
      3612 8154 3612 8171 3611 8181 3615 8182
TIME...MOT...LOC 1817Z 282DEG 14KT 3629 8131 

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

$$

ET

2 follow-up statements

389 
WWUS51 KRNK 121848
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
248 PM EDT Thu Aug 12 2021

NCC005-009-171-189-193-197-121915-
/O.CON.KRNK.SV.W.0155.000000T0000Z-210812T1915Z/
Alleghany NC-Surry NC-Wilkes NC-Watauga NC-Ashe NC-Yadkin NC-
248 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR
CENTRAL ALLEGHANY...WESTERN SURRY...WILKES...SOUTHEASTERN WATAUGA...
SOUTHEASTERN ASHE AND NORTHWESTERN YADKIN COUNTIES IN NORTHWESTERN
NORTH CAROLINA...

At 248 PM EDT, a severe thunderstorm was located over Mulberry, or
near Mc Grady, 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...
Boone...
North Wilkesboro...
Elkin...
Wilkesboro...
Fairview...
Jonesville...
and Sparta.

This includes The following Location Appalachian State University.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for LARGE HAIL AND DAMAGING WINDS, as well as
deadly cloud to ground lightning. 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 3643 8142 3656 8087 3656 8075 3626 8064
      3607 8142 3607 8144 3609 8146 3610 8151
      3612 8154 3612 8166 3624 8169
TIME...MOT...LOC 1848Z 282DEG 14KT 3626 8116 

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

$$

ET

410 
WWUS51 KRNK 121906
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
306 PM EDT Thu Aug 12 2021

NCC005-009-171-189-193-197-121916-
/O.EXP.KRNK.SV.W.0155.000000T0000Z-210812T1915Z/
Alleghany NC-Surry NC-Wilkes NC-Watauga NC-Ashe NC-Yadkin NC-
306 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
CENTRAL ALLEGHANY...WESTERN SURRY...WILKES...SOUTHEASTERN WATAUGA...
SOUTHEASTERN ASHE AND NORTHWESTERN YADKIN COUNTIES IN NORTHWESTERN
NORTH CAROLINA WILL EXPIRE AT 315 PM EDT...
                
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 will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

LAT...LON 3643 8142 3656 8087 3656 8075 3626 8064
      3607 8142 3607 8144 3609 8146 3610 8151
      3612 8154 3612 8166 3624 8169
TIME...MOT...LOC 1906Z 282DEG 14KT 3625 8108 

$$

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 12:57 PM EDT	Special Weather Statement	RNK	Alleghany	33 min
Aug 12, 1:22 PM EDT	Special Weather Statement	RNK	Wilkes	23 min
Aug 12, 1:35 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Surry, Wilkes, Yadkin	55 min
Aug 12, 1:45 PM EDT	Special Weather Statement	RNK	Watauga	30 min
Aug 12, 2:27 PM EDT	Areal Flood Advisory	RNK	Alleghany, Ashe, Surry, Watauga, Wilkes	3 hr
Aug 12, 2:57 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham, Stokes	51 min
Aug 12, 3:11 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe, Watauga, Wilkes	53 min
Aug 12, 3:24 PM EDT	Special Weather Statement	RNK	Surry	36 min
Aug 12, 3:31 PM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry	14 min
Aug 12, 3:46 PM EDT	Special Weather Statement	RNK	Ashe	29 min
Aug 12, 3:53 PM EDT	Special Weather Statement	RNK	Rockingham	37 min
Aug 12, 3:58 PM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry	47 min
Aug 12, 4:03 PM EDT	Areal Flood Advisory	RNK	Ashe, Wilkes	3 hr
Aug 12, 4:27 PM EDT	Severe Thunderstorm Warning	RNK	Yadkin	37 min

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.