Alert archive / Virginia / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 106, NWS Blacksburg, VA

July 21, 2020Floyd County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 21, 2020, 2:49 PM EDT for Floyd County, Virginia. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 21, 2020, 2:49 PM EDT (18:49 UTC)
Expired: Jul 21, 2020, 3:30 PM EDT
In force: 41 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Floyd County, VA

The radar

The Roanoke radar (KFCX), 13 km from the middle of the area, began a volume at 18:52 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.8 hours before the alert went out and 343 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: 1997 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 2:26 PM EDT, 23 minutes earlier.

Area forecast discussion, Jul 21, 2:26 PM EDT, 23 minutes before

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Hazardous weather outlook, Jul 21, 2:17 PM EDT, 32 minutes before

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In the hours before

Special weather statement, Jul 21, 1:16 PM EDT, 1 hour 33 minutes before

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Special weather statement, Jul 21, 1:39 PM EDT, 1 hour 10 minutes before

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Special weather statement, Jul 21, 1:41 PM EDT, 1 hour 8 minutes before

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Special weather statement, Jul 21, 1:45 PM EDT, 1 hour 4 minutes before

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Special weather statement, Jul 21, 2:15 PM EDT, 34 minutes before

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Special weather statement, Jul 21, 2:43 PM EDT, 6 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 9:38 PM EDT	Heat Advisory	RNK	Appomattox, Buckingham, Campbell, Charlotte, Halifax, Pittsylvania and 2 more	22 hr
Jul 20, 10:08 PM EDT	Special Weather Statement	RNK	Smyth	37 min
Jul 21, 12:19 PM EDT	Special Weather Statement	RNK	City of Galax	26 min
Jul 21, 12:50 PM EDT	Special Weather Statement	RNK	Pulaski	25 min
Jul 21, 1:16 PM EDT	Special Weather Statement	RNK	Pulaski, City of Radford	29 min
Jul 21, 1:29 PM EDT	Severe Thunderstorm Warning	RNK	Carroll	61 min
Jul 21, 1:39 PM EDT	Special Weather Statement	RNK	City of Salem	36 min
Jul 21, 1:41 PM EDT	Special Weather Statement	RNK	City of Galax	34 min
Jul 21, 1:45 PM EDT	Special Weather Statement	RNK	Montgomery	30 min
Jul 21, 2:15 PM EDT	Special Weather Statement	RNK	Floyd	30 min
Jul 21, 2:43 PM EDT	Special Weather Statement	RNK	Floyd	32 min
Jul 21, 2:57 PM EDT	Special Weather Statement	RNK	Craig	33 min
Jul 21, 3:05 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt, Craig	40 min
Jul 21, 3:13 PM EDT	Special Weather Statement	RNK	City of Roanoke	32 min
Jul 21, 3:22 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Botetourt, Franklin, Roanoke, City of Roanoke	38 min
Jul 21, 3:44 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Lexington	31 min
Jul 21, 4:03 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, City of Lynchburg	57 min
Jul 21, 4:35 PM EDT	Special Weather Statement	RNK	Bath	25 min
Jul 21, 6:34 PM EDT	Special Weather Statement	RNK	Bland	41 min
Jul 21, 7:22 PM EDT	Special Weather Statement	RNK	Halifax	23 min
Jul 21, 3:36 PM EDT	Special Weather Statement	RNK	Alleghany, Ashe, Watauga	24 min
Jul 21, 4:17 PM EDT	Special Weather Statement	RNK	Watauga	28 min
Jul 21, 4:47 PM EDT	Special Weather Statement	RNK	Wilkes	28 min
Jul 21, 5:16 PM EDT	Special Weather Statement	RNK	Wilkes	29 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2020 Every severe thunderstorm warning in 2020

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.