Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 157, NWS Blacksburg, VA

August 12, 20214 counties in North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 12, 2021, 3:11 PM EDT for 4 counties in North Carolina. It was in force for 53 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, 3:11 PM EDT (19:11 UTC)
Expired: Aug 12, 2021, 4:04 PM EDT
In force: 53 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Roanoke radar (KFCX), 135 km from the middle of the area, began a volume at 19:12 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, 3:15 PM EDT	HAIL 1.75	Jefferson, NC
Aug 12, 3:20 PM EDT	TSTM WND DMG	1 S Boomer, NC	MULTIPLE TREES DOWN IN THE BOOMER AREA.
Aug 12, 3:20 PM EDT	TSTM WND DMG	Boomer, NC	MULTIPLE TREES DOWN IN THE BOOMER AREA.

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, 7.2 hours before the alert went out and 123 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.

894 
WUUS51 KRNK 121911
SVRRNK
NCC005-009-189-193-122015-
/O.NEW.KRNK.SV.W.0157.210812T1911Z-210812T2015Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Southwestern Alleghany County in northwestern North Carolina...
  Wilkes County in northwestern North Carolina...
  Southeastern Watauga County in northwestern North Carolina...
  Central Ashe County in northwestern North Carolina...

* Until 415 PM EDT.

* At 311 PM EDT, a severe thunderstorm was located over Wilkesboro
  Reservoir, or near Boomer, moving east at 10 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Jefferson...
  West Jefferson...
  Ronda...
  Lansing...
  and Traphill.

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 3601 8134 3604 8139 3607 8141 3607 8144
      3609 8146 3610 8151 3612 8154 3612 8162
      3657 8153 3636 8090 3634 8088 3606 8088
      3606 8098 3603 8106 3604 8114 3603 8117
      3604 8120 3603 8127 3601 8130
TIME...MOT...LOC 1911Z 287DEG 10KT 3615 8129 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

3 follow-up statements

991 
WWUS51 KRNK 121938
SVSRNK

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

NCC005-009-189-121947-
/O.CAN.KRNK.SV.W.0157.000000T0000Z-210812T2015Z/
Alleghany NC-Watauga NC-Ashe NC-
338 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
SOUTHWESTERN ALLEGHANY...SOUTHEASTERN WATAUGA AND CENTRAL ASHE
COUNTIES IN NORTHWESTERN NORTH CAROLINA IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
moved out of the warned area. Additional strong storms remain in the 
area with wind gusts up to 40 mph and pea to nickel size hail. 


LAT...LON 3607 8142 3629 8127 3621 8088 3606 8088
      3606 8098 3603 8106 3604 8114 3603 8117
      3604 8120 3603 8127 3601 8130 3601 8133
      3603 8138 3604 8139 3607 8141
TIME...MOT...LOC 1937Z 302DEG 20KT 3605 8112 

$$

NCC193-122015-
/O.CON.KRNK.SV.W.0157.000000T0000Z-210812T2015Z/
Wilkes NC-
338 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR
SOUTHERN WILKES COUNTY...

At 337 PM EDT, a severe thunderstorm was located near Moravian Falls,
or near Wilkesboro, moving southeast at 25 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...
Boomer...
Windy Gap...
Mulberry...
and Wilkesboro Reservoir.

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 3607 8142 3629 8127 3621 8088 3606 8088
      3606 8098 3603 8106 3604 8114 3603 8117
      3604 8120 3603 8127 3601 8130 3601 8133
      3603 8138 3604 8139 3607 8141
TIME...MOT...LOC 1937Z 302DEG 20KT 3605 8112 

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

$$

ET

837 
WWUS51 KRNK 121953
SVSRNK

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

NCC193-122015-
/O.CON.KRNK.SV.W.0157.000000T0000Z-210812T2015Z/
Wilkes NC-
353 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR SOUTHEASTERN WILKES COUNTY...

At 352 PM EDT, a severe thunderstorm was located near Love Valley, or
8 miles southeast of Wilkesboro, moving east at 10 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
North Wilkesboro...
Wilkesboro...
Boomer...
Windy Gap...
Cricket...
Buck...
and Clingman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for ${CTAhailwindthreat}, 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 3620 8122 3619 8088 3606 8088 3606 8098
      3603 8106 3604 8114 3603 8117 3604 8120
      3603 8127 3601 8130 3601 8131
TIME...MOT...LOC 1952Z 287DEG 10KT 3604 8107 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ET

962 
WWUS51 KRNK 122004
SVSRNK

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

NCC193-122014-
/O.CAN.KRNK.SV.W.0157.000000T0000Z-210812T2015Z/
Wilkes NC-
404 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
SOUTHEASTERN WILKES COUNTY 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.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 3620 8122 3619 8088 3606 8088 3606 8098
      3603 8106 3604 8114 3603 8117 3604 8120
      3603 8127 3601 8130 3601 8131
TIME...MOT...LOC 2003Z 287DEG 10KT 3603 8103 

$$

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, 2:18 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe, Surry, Watauga, Wilkes, Yadkin	57 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, 3:24 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.