Alert archive / North Carolina / Special Weather Statements in 2021

Special Weather Statement, NWS Blacksburg, VA

July 27, 2021Alleghany County, North Carolina

NWS Blacksburg, VA issued this special weather statement at Jul 27, 2021, 4:02 PM EDT for Alleghany County, North Carolina. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 27, 2021, 4:02 PM EDT (20:02 UTC)
Expired: Jul 27, 2021, 4:30 PM EDT
In force: 28 min
Issued by: NWS Blacksburg, VA

County Alleghany County, NC

The radar

The Roanoke radar (KFCX), 106 km from the middle of the area, began a volume at 20:05 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.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.0 hours before the alert went out and 121 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: 480 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 942 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

459 
WWUS81 KRNK 272002
SPSRNK

Special Weather Statement
National Weather Service BLACKSBURG VA
402 PM EDT Tue Jul 27 2021

NCZ001-002-019-272030-
Ashe-Wilkes-Alleghany-
402 PM EDT Tue Jul 27 2021

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL ALLEGHANY...NORTH 
CENTRAL WILKES AND EAST CENTRAL ASHE COUNTIES IN NORTHWESTERN NORTH 
CAROLINA...

At 402 PM EDT, a strong thunderstorm was located over Doughton Park,
or over Laurel Springs, moving southeast at 5 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
Sparta...
Laurel Springs...
Traphill...
Mc Grady...
Roaring Gap...
Stone Mountain State Park...
and Abshers.

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.

LAT...LON 3645 8139 3653 8119 3640 8097 3640 8096
      3621 8120
TIME...MOT...LOC 2002Z 316DEG 6KT 3642 8122 

$$

BMG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 8:02 PM EDT	Special Weather Statement	RNK	Bland	43 min
Jul 26, 8:08 PM EDT	Areal Flood Advisory	RNK	Appomattox, Campbell	112 min
Jul 26, 8:29 PM EDT	Special Weather Statement	RNK	Grayson, Wythe	61 min
Jul 27, 3:15 AM EDT	Dense Fog Advisory	RNK	Bland, Craig, Giles, Montgomery, Pulaski, Smyth and 3 more	6 hr
Jul 27, 4:53 PM EDT	Special Weather Statement	RNK	Wilkes	37 min
Jul 27, 5:10 PM EDT	Severe Thunderstorm Warning	RNK	Wilkes, Yadkin	53 min

Nearby

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.