Alert archive / Virginia / Special Weather Statements in 2017

Special Weather Statement, NWS Blacksburg, VA

July 23, 2017Grayson County, Virginia

NWS Blacksburg, VA issued this special weather statement at Jul 23, 2017, 5:50 AM EDT for Grayson County, Virginia. It was in force for 55 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 23, 2017, 5:50 AM EDT (09:50 UTC)
Expired: Jul 23, 2017, 6:45 AM EDT
In force: 55 min
Issued by: NWS Blacksburg, VA

County Grayson County, VA

The radar

The Roanoke radar (KFCX), 118 km from the middle of the area, began a volume at 09:51 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

Roanoke, VA (KRNK), launched 00:00Z, 9.8 hours before the alert went out and 189 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: 634 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1871 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 23, 3:42 AM EDT, 2 hours 8 minutes earlier.

Area forecast discussion, Jul 23, 3:42 AM EDT, 2 hours 8 minutes before

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Hazardous weather outlook, Jul 23, 3:58 AM EDT, 1 hour 52 minutes before

Hazardous Weather Outlook
National Weather Service Blacksburg VA
358 AM EDT Sun Jul 23 2017

NCZ001-002-018-VAZ007-009>013-015-018>020-WVZ042>044-507-508-240800-
Ashe-Alleghany NC-Watauga-Tazewell-Smyth-Bland-Giles-Wythe-Pulaski-
Grayson-Craig-Alleghany VA-Bath-Mercer-Summers-Monroe-
Eastern Greenbrier-Western Greenbrier-
358 AM EDT Sun Jul 23 2017

This Hazardous Weather Outlook is for northwest North Carolina,
southwest Virginia, west central Virginia and southeast West
Virginia.

.DAY ONE...Today and tonight.

Thunderstorms this afternoon and evening could become severe. The
main threat will be damaging winds. Isolated large hail and localized
heavy rain leading to flooding are possible as well.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

NCZ003>006-019-020-VAZ014-016-017-022>024-032>035-043>047-058-059-
240800-
Surry-Stokes-Rockingham-Caswell-Wilkes-Yadkin-Montgomery-Carroll-
Floyd-Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst-
Henry-Pittsylvania-Campbell-Appomattox-Buckingham-Halifax-Charlotte-
358 AM EDT Sun Jul 23 2017

This Hazardous Weather Outlook is for north central North Carolina,
northwest North Carolina, central Virginia, south central Virginia,
southwest Virginia and west central Virginia.

.DAY ONE...Today and tonight.

Thunderstorms this afternoon and evening could become severe, with
damaging winds the main threat. Isolated large hail is also possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

In the hours before

Special weather statement, Jul 23, 2:19 AM EDT, 3 hours 31 minutes before

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Special weather statement, Jul 23, 3:17 AM EDT, 2 hours 33 minutes before

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Special weather statement, Jul 23, 4:45 AM EDT, 1 hour 5 minutes before

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Special weather statement, Jul 23, 4:49 AM EDT, 1 hour 1 minute before

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Special weather statement, Jul 23, 5:46 AM EDT, 4 minutes before

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Special weather statement, Jul 23, 5:50 AM EDT, 0 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 22, 9:24 PM EDT	Special Weather Statement	RNK	Alleghany, Craig, City of Covington	66 min
Jul 22, 9:52 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	53 min
Jul 22, 10:07 PM EDT	Special Weather Statement	RNK	Montgomery	53 min
Jul 22, 10:29 PM EDT	Special Weather Statement	RNK	Amherst, Bedford, City of Buena Vista, City of Lynchburg	61 min
Jul 22, 10:53 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, City of Lynchburg	52 min
Jul 22, 11:12 PM EDT	Special Weather Statement	RNK	Appomattox, Buckingham	63 min
Jul 23, 12:27 AM EDT	Special Weather Statement	RNK	Appomattox	63 min
Jul 23, 12:54 AM EDT	Special Weather Statement	RNK	Charlotte	66 min
Jul 23, 1:15 AM EDT	Special Weather Statement	RNK	Giles	60 min
Jul 23, 1:29 AM EDT	Special Weather Statement	RNK	Appomattox	61 min
Jul 23, 1:32 AM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	58 min
Jul 23, 4:45 AM EDT	Special Weather Statement	RNK	Bland, Tazewell	60 min
Jul 23, 5:46 AM EDT	Special Weather Statement	RNK	Bland, Pulaski	59 min
Jul 23, 7:14 PM EDT	Special Weather Statement	RNK	Tazewell	46 min
Jul 23, 2:19 AM EDT	Special Weather Statement	RNK	Ashe	41 min
Jul 23, 3:17 AM EDT	Special Weather Statement	RNK	Alleghany, Ashe	43 min
Jul 23, 3:59 PM EDT	Special Weather Statement	RNK	Stokes	31 min
Jul 23, 4:30 PM EDT	Special Weather Statement	RNK	Stokes	30 min
Jul 23, 4:42 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham, Stokes	26 min
Jul 23, 12:09 AM EDT	Special Weather Statement	RNK	Greenbrier	66 min
Jul 23, 4:49 AM EDT	Special Weather Statement	RNK	Mercer	56 min

Nearby

Special Weather Statements in Virginia, 2017 Every special weather statement in 2017

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.