Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 160, NWS Blacksburg, VA

August 12, 2021Stokes County, Surry County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 12, 2021, 3:31 PM EDT for Stokes County, Surry County, North Carolina. It was in force for 14 min. 2 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, 3:31 PM EDT (19:31 UTC)
Expired
Aug 12, 2021, 3:45 PM EDT
In force
14 min
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Stokes County, NC, Surry County, NC

The radar

The Roanoke radar (KFCX), 83 km from the middle of the area, began a volume at 19:33 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

TimeReportWhereRemark
Aug 12, 3:32 PM EDTTSTM WND DMG3 Ese Westfield, NCTREES DOWN NEAR SHEEP FARM ROAD AND HIGHWAY 52.
Aug 12, 3:32 PM EDTTSTM WND DMG3 Ese Westfield, NCTREES DOWN NEAR SHEEP FARM ROAD AND OLD US 52.

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 59 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2021-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1015 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2021-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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.

979 
WUUS51 KRNK 121931
SVRRNK
NCC169-171-122000-
/O.NEW.KRNK.SV.W.0160.210812T1931Z-210812T2000Z/

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

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  Eastern Surry County in northwestern North Carolina...
  Southwestern Stokes County in north central North Carolina...

* Until 400 PM EDT.

* At 331 PM EDT, a severe thunderstorm was located over Ararat, or
  near Pilot Mountain, 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...
  Mount Airy...
  Dobson...
  Pilot Mountain...
  King...
  Pilot Mountain State Park...
  Level Cross...
  and Siloam.

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 3626 8047 3626 8053 3628 8054 3628 8058
      3640 8072 3652 8055 3626 8027 3626 8045
      3625 8045 3625 8046
TIME...MOT...LOC 1931Z 319DEG 20KT 3641 8058 

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

$$

ET
1 follow-up statement
198 
WWUS51 KRNK 121945
SVSRNK

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

NCC169-171-121955-
/O.CAN.KRNK.SV.W.0160.000000T0000Z-210812T2000Z/
Surry NC-Stokes NC-
345 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
EASTERN SURRY AND SOUTHWESTERN STOKES COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

LAT...LON 3626 8047 3626 8053 3628 8054 3628 8058
      3640 8072 3652 8055 3626 8027 3626 8045
      3625 8045 3625 8046
TIME...MOT...LOC 1944Z 319DEG 20KT 3635 8051 

$$

ET

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 12:57 PM EDTSpecial Weather StatementRNKAlleghany33 min
Aug 12, 1:22 PM EDTSpecial Weather StatementRNKWilkes23 min
Aug 12, 1:35 PM EDTSevere Thunderstorm WarningRNKAlleghany, Surry, Wilkes, Yadkin55 min
Aug 12, 1:45 PM EDTSpecial Weather StatementRNKWatauga30 min
Aug 12, 2:18 PM EDTSevere Thunderstorm WarningRNKAlleghany, Ashe, Surry, Watauga, Wilkes, Yadkin57 min
Aug 12, 2:27 PM EDTAreal Flood AdvisoryRNKAlleghany, Ashe, Surry, Watauga, Wilkes3 hr
Aug 12, 2:57 PM EDTSevere Thunderstorm WarningRNKRockingham, Stokes51 min
Aug 12, 3:11 PM EDTSevere Thunderstorm WarningRNKAlleghany, Ashe, Watauga, Wilkes53 min
Aug 12, 3:24 PM EDTSpecial Weather StatementRNKSurry36 min
Aug 12, 3:46 PM EDTSpecial Weather StatementRNKAshe29 min
Aug 12, 3:53 PM EDTSpecial Weather StatementRNKRockingham37 min
Aug 12, 3:58 PM EDTSevere Thunderstorm WarningRNKStokes, Surry47 min
Aug 12, 4:03 PM EDTAreal Flood AdvisoryRNKAshe, Wilkes3 hr
Aug 12, 4:27 PM EDTSevere Thunderstorm WarningRNKYadkin37 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2021Every 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.