Alert archive / Virginia / Special Weather Statements in 2021

Special Weather Statement, NWS Blacksburg, VA

August 7, 2021Grayson County, Wythe County, Virginia; Alleghany County, Watauga County, North Carolina

NWS Blacksburg, VA issued this special weather statement at Aug 7, 2021, 4:34 PM EDT for Grayson County, Wythe County, Virginia; Alleghany County, Watauga County, North Carolina. It was in force for 26 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 7, 2021, 4:34 PM EDT (20:34 UTC)
Expired: Aug 7, 2021, 5:00 PM EDT
In force: 26 min
Issued by: NWS Blacksburg, VA
Hail: 0.00 in
Wind: 30

Counties Alleghany County, NC, Watauga County, NC, Grayson County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 112 km from the middle of the area, began a volume at 20:34 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 7, 4:53 PM EDT	TSTM WND DMG	4 E Wagoner, NC	ONE TREE DOWN AT THE INTERSECTION OF ORE KNOB ROAD AND LITTLE PEAK CREEK ROAD. TIME ESTIMATED BY RADAR.

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, 8.6 hours before the alert went out and 139 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: 17 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 543 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

337 
WWUS81 KRNK 072034
SPSRNK

Special Weather Statement
National Weather Service BLACKSBURG VA
434 PM EDT Sat Aug 7 2021
 
NCZ001-002-018-019-VAZ009-012-015-072100-
Ashe NC-Wilkes NC-Watauga NC-Alleghany NC-Grayson VA-Wythe VA-
Smyth VA-
434 PM EDT Sat Aug 7 2021

...Strong thunderstorms will impact portions of 
western Alleghany, northwestern Wilkes, southern Watauga and eastern
Ashe Counties in northwestern North Carolina, east central Smyth,
southwestern Wythe and central Grayson Counties in southwestern
Virginia through 500 PM EDT...

At 434 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Rural Retreat to near Scottville to Fleetwood
to near Bakersville. Movement was east at 20 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Boone...
Wytheville...
Sparta...
Jefferson...
Rural Retreat...
West Jefferson...
and Blowing Rock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3631 8161 3649 8144 3698 8130 3697 8096
      3681 8101 3681 8104 3678 8102 3646 8112
      3629 8126 3612 8155 3611 8181 3618 8184
TIME...MOT...LOC 2034Z 274DEG 18KT 3691 8124 3649 8137 3631 8153 3598
8214

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

$$

RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 2:21 PM EDT	Special Weather Statement	RNK	Smyth, Tazewell	54 min
Aug 7, 3:28 PM EDT	Special Weather Statement	RNK	Grayson, Wythe	62 min
Aug 7, 3:40 PM EDT	Special Weather Statement	RNK	Tazewell	65 min
Aug 7, 4:03 PM EDT	Special Weather Statement	RNK	Buchanan	27 min
Aug 7, 4:55 PM EDT	Special Weather Statement	RNK	Giles	35 min
Aug 7, 5:09 PM EDT	Special Weather Statement	RNK	Giles	36 min
Aug 7, 5:27 PM EDT	Special Weather Statement	RNK	Pulaski	33 min
Aug 7, 5:38 PM EDT	Special Weather Statement	RNK	Carroll, City of Galax	37 min
Aug 7, 5:40 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, Patrick, City of Galax	65 min
Aug 7, 6:00 PM EDT	Special Weather Statement	RNK	Pulaski	30 min
Aug 7, 6:43 PM EDT	Special Weather Statement	RNK	Carroll	32 min
Aug 7, 6:54 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Floyd, Patrick	66 min
Aug 7, 3:54 PM EDT	Special Weather Statement	RNK	Wilkes	51 min
Aug 7, 4:24 PM EDT	Severe Thunderstorm Warning	RNK	Watauga, Wilkes	43 min
Aug 7, 4:39 PM EDT	Areal Flood Advisory	RNK	Wilkes	3 hr
Aug 7, 4:47 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe, Watauga, Wilkes	58 min
Aug 7, 5:02 PM EDT	Special Weather Statement	RNK	Caldwell	28 min
Aug 7, 5:24 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Surry, Wilkes	66 min
Aug 7, 6:29 PM EDT	Special Weather Statement	RNK	Surry, Yadkin	46 min
Aug 7, 4:14 PM EDT	Special Weather Statement	RNK	Mercer, Summers	46 min

Nearby

Special Weather Statements in Virginia, 2021 Special Weather Statements in North Carolina, 2021 Every special weather statement 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.