Alert archive / Virginia / Special Weather Statements in 2021

Special Weather Statement, NWS Blacksburg, VA

July 13, 2021Botetourt County, Virginia

NWS Blacksburg, VA issued this special weather statement at Jul 13, 2021, 4:00 PM EDT for Botetourt County, Virginia. It was in force for 30 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: Jul 13, 2021, 4:00 PM EDT (20:00 UTC)
Expired: Jul 13, 2021, 4:30 PM EDT
In force: 30 min
Issued by: NWS Blacksburg, VA

County Botetourt County, VA

The radar

The Roanoke radar (KFCX), 76 km from the middle of the area, began a volume at 20:01 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
Jul 13, 4:10 PM EDT	TSTM WND DMG	2 W Springwood, VA	TREE DOWN BLOCKING ROAD. TIME ESTIMATED FROM RADAR.
Jul 13, 4:14 PM EDT	TSTM WND DMG	2 E Springwood, VA	ONE TREE DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 8.0 hours before the alert went out and 38 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1339 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

672 
WWUS81 KRNK 132000
SPSRNK

Special Weather Statement
National Weather Service BLACKSBURG VA
400 PM EDT Tue Jul 13 2021

VAZ023-132030-
Botetourt-
400 PM EDT Tue Jul 13 2021

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL BOTETOURT COUNTY...

At 359 PM EDT, a strong thunderstorm was located over Lithia, or near
Buchanan, moving northeast at 15 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

This will impact Interstate 81 between mile markers 150 and 165 with 
very heavy rainfall, severely reduced visibility, small hail, wind 
gusts, and cloud-to-ground lightning.

Locations impacted include...
Buchanan...
Fincastle...
Arcadia...
Springwood...
Lithia...
Nace...
and Blue Ridge.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3769 7969 3767 7967 3766 7968 3763 7962
      3752 7951 3749 7954 3750 7956 3747 7958
      3745 7961 3745 7963 3748 7965 3748 7968
      3742 7976 3740 7981 3738 7977 3736 7979
      3752 7991
TIME...MOT...LOC 1959Z 238DEG 15KT 3748 7978 

$$

RAB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 2:09 PM EDT	Special Weather Statement	RNK	Montgomery, Pulaski, City of Radford	36 min
Jul 13, 2:37 PM EDT	Severe Thunderstorm Warning	RNK	Montgomery	38 min
Jul 13, 3:14 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt, Craig, Montgomery, Roanoke	46 min
Jul 13, 3:41 PM EDT	Special Weather Statement	RNK	Wythe	34 min
Jul 13, 3:46 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	29 min
Jul 13, 4:04 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt	41 min
Jul 13, 4:33 PM EDT	Special Weather Statement	RNK	Pulaski	42 min
Jul 13, 5:03 PM EDT	Special Weather Statement	RNK	Pulaski	42 min
Jul 13, 5:21 PM EDT	Special Weather Statement	RNK	Wythe	39 min
Jul 13, 6:00 PM EDT	Special Weather Statement	RNK	Alleghany	45 min
Jul 13, 6:36 PM EDT	Special Weather Statement	RNK	Bath	39 min
Jul 13, 6:53 PM EDT	Special Weather Statement	RNK	Smyth	52 min
Jul 13, 7:40 PM EDT	Special Weather Statement	RNK	Wythe	50 min
Jul 13, 6:21 PM EDT	Special Weather Statement	RNK	Greenbrier	39 min

Nearby

Special Weather Statements in Virginia, 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.