Alert archive / North Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 77, NWS Blacksburg, VA

July 5, 2020Grayson County, Virginia; Alleghany County, Ashe County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 5, 2020, 1:55 PM EDT for Grayson County, Virginia; Alleghany County, Ashe County, North Carolina. It was in force for 50 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 5, 2020, 1:55 PM EDT (17:55 UTC)
Expired: Jul 5, 2020, 2:45 PM EDT
In force: 50 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Alleghany County, NC, Ashe County, NC, Grayson County, VA

The radar

The Roanoke radar (KFCX), 106 km from the middle of the area, began a volume at 17:55 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, 5.9 hours before the alert went out and 134 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: 667 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1308 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 2 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 5, 7:02 AM EDT, 6 hours 53 minutes earlier.

Area forecast discussion, Jul 5, 7:02 AM EDT, 6 hours 53 minutes before

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Hazardous weather outlook, Jul 5, 4:41 AM EDT, 9 hours 14 minutes before

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In the hours before

Special weather statement, Jul 5, 12:55 PM EDT, 1 hour before

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Special weather statement, Jul 5, 1:01 PM EDT, 54 minutes before

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Special weather statement, Jul 5, 1:35 PM EDT, 20 minutes before

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Special weather statement, Jul 5, 1:38 PM EDT, 17 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 5, 1:01 PM EDT	Special Weather Statement	RNK	Smyth	29 min
Jul 5, 1:35 PM EDT	Special Weather Statement	RNK	Craig	25 min
Jul 5, 1:38 PM EDT	Special Weather Statement	RNK	Grayson	37 min
Jul 5, 2:27 PM EDT	Special Weather Statement	RNK	Bland, Wythe	48 min
Jul 5, 2:39 PM EDT	Special Weather Statement	RNK	Roanoke, City of Salem	36 min
Jul 5, 2:50 PM EDT	Special Weather Statement	RNK	Tazewell	25 min
Jul 5, 3:09 PM EDT	Special Weather Statement	RNK	Buckingham	36 min
Jul 5, 3:38 PM EDT	Special Weather Statement	RNK	Tazewell	52 min
Jul 5, 4:02 PM EDT	Special Weather Statement	RNK	Buckingham	28 min
Jul 5, 4:31 PM EDT	Special Weather Statement	RNK	Buckingham	59 min
Jul 5, 5:39 PM EDT	Special Weather Statement	RNK	Buckingham	36 min
Jul 5, 6:27 PM EDT	Severe Thunderstorm Warning	RNK	Bath, Rockbridge	63 min
Jul 5, 6:51 PM EDT	Special Weather Statement	RNK	Appomattox	24 min
Jul 5, 7:14 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick	61 min
Jul 5, 7:27 PM EDT	Special Weather Statement	RNK	Amherst	33 min
Jul 5, 12:55 PM EDT	Special Weather Statement	RNK	Ashe	35 min
Jul 5, 2:34 PM EDT	Special Weather Statement	RNK	Alleghany, Ashe	26 min
Jul 5, 3:04 PM EDT	Special Weather Statement	RNK	Wilkes	26 min
Jul 5, 3:38 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe, Wilkes	52 min
Jul 5, 4:12 PM EDT	Special Weather Statement	RNK	Caldwell	33 min
Jul 5, 4:29 PM EDT	Special Weather Statement	RNK	Surry	31 min
Jul 5, 5:41 PM EDT	Special Weather Statement	RNK	Stokes	49 min
Jul 5, 6:47 PM EDT	Special Weather Statement	RNK	Rockingham	28 min
Jul 5, 5:02 PM EDT	Special Weather Statement	RNK	Mercer, Summers	43 min
Jul 5, 6:53 PM EDT	Special Weather Statement	RNK	Greenbrier	37 min
Jul 5, 7:41 PM EDT	Special Weather Statement	RNK	Greenbrier	34 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2020 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.