Alert archive / North Carolina / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 277, NWS Blacksburg, VA

September 28, 2019Grayson County, Virginia; Alleghany County, Surry County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Sep 28, 2019, 5:34 PM EDT for Grayson County, Virginia; Alleghany County, Surry County, North Carolina. It was in force for 17 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: Sep 28, 2019, 5:34 PM EDT (21:34 UTC)
Expired: Sep 28, 2019, 5:51 PM EDT
In force: 17 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Alleghany County, NC, Surry County, NC, Grayson County, VA

The radar

The Roanoke radar (KFCX), 86 km from the middle of the area, began a volume at 21:37 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 12:00Z, 9.6 hours before the alert went out and 154 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: 949 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 998 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.8

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 Sep 28, 4:04 PM EDT, 1 hour 30 minutes earlier.

Area forecast discussion, Sep 28, 4:04 PM EDT, 1 hour 30 minutes before

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Hazardous weather outlook, Sep 28, 1:19 PM EDT, 4 hours 15 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Blacksburg VA
119 PM EDT Sat Sep 28 2019

NCZ001>004-018>020-VAZ007-009>020-022>024-032>035-043-WVZ042>044-507-
508-291730-
Ashe-Alleghany NC-Surry-Stokes-Watauga-Wilkes-Yadkin-Tazewell-Smyth-
Bland-Giles-Wythe-Pulaski-Montgomery-Grayson-Carroll-Floyd-Craig-
Alleghany VA-Bath-Roanoke-Botetourt-Rockbridge-Patrick-Franklin-
Bedford-Amherst-Henry-Mercer-Summers-Monroe-Eastern Greenbrier-
Western Greenbrier-
119 PM EDT Sat Sep 28 2019

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

.DAY ONE...This afternoon and tonight.

Strong to isolated severe thunderstorms producing localized damaging
winds and hail could occur through late this afternoon.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ005-006-VAZ044>047-058-059-291730-
Rockingham-Caswell-Pittsylvania-Campbell-Appomattox-Buckingham-
Halifax-Charlotte-
119 PM EDT Sat Sep 28 2019

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

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Sep 28, 4:59 PM EDT, 35 minutes before

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Local storm report, Sep 28, 5:21 PM EDT, 13 minutes before

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Local storm report, Sep 28, 5:26 PM EDT, 8 minutes before

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Special weather statement, Sep 28, 5:30 PM EDT, 4 minutes before

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Special weather statement, Sep 28, 5:32 PM EDT, 2 minutes before

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Local storm report, Sep 28, 5:33 PM EDT, 1 minute 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
Sep 28, 3:30 AM EDT	Special Weather Statement	RNK	Patrick	30 min
Sep 28, 12:33 PM EDT	Special Weather Statement	RNK	Bland	27 min
Sep 28, 12:36 PM EDT	Special Weather Statement	RNK	Alleghany	39 min
Sep 28, 1:06 PM EDT	Special Weather Statement	RNK	Carroll, Grayson, City of Galax	39 min
Sep 28, 1:11 PM EDT	Special Weather Statement	RNK	Bath	49 min
Sep 28, 1:16 PM EDT	Severe Thunderstorm Warning	RNK	Bath	44 min
Sep 28, 1:18 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Grayson, City of Galax	42 min
Sep 28, 1:21 PM EDT	Special Weather Statement	RNK	Montgomery	24 min
Sep 28, 1:25 PM EDT	Severe Thunderstorm Warning	RNK	Giles, Montgomery	32 min
Sep 28, 1:28 PM EDT	Special Weather Statement	RNK	Bath	47 min
Sep 28, 1:34 PM EDT	Special Weather Statement	RNK	Botetourt	26 min
Sep 28, 1:38 PM EDT	Special Weather Statement	RNK	Roanoke, City of Roanoke, City of Salem	37 min
Sep 28, 1:41 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt, Roanoke, City of Roanoke, City of Salem	49 min
Sep 28, 1:45 PM EDT	Special Weather Statement	RNK	Pulaski, City of Radford	45 min
Sep 28, 1:51 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Montgomery, Pulaski	39 min
Sep 28, 2:07 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Buena Vista, City of Lexington	38 min
Sep 28, 2:25 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Floyd, Pulaski	50 min
Sep 28, 2:29 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Botetourt, Franklin, Roanoke, City of Roanoke	31 min
Sep 28, 2:30 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Rockbridge, City of Buena Vista, City of Lexington	60 min
Sep 28, 2:46 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles	27 min
Sep 28, 3:05 PM EDT	Special Weather Statement	RNK	Franklin	25 min
Sep 28, 3:15 PM EDT	Severe Thunderstorm Warning	RNK	Pulaski, Wythe	34 min
Sep 28, 3:27 PM EDT	Areal Flood Advisory	RNK	Pulaski	96 min
Sep 28, 3:29 PM EDT	Severe Thunderstorm Warning	RNK	Amherst	18 min
Sep 28, 3:39 PM EDT	Special Weather Statement	RNK	Giles	36 min
Sep 28, 4:10 PM EDT	Special Weather Statement	RNK	City of Galax	35 min
Sep 28, 4:22 PM EDT	Special Weather Statement	RNK	Craig	23 min
Sep 28, 4:47 PM EDT	Special Weather Statement	RNK	Craig	28 min
Sep 28, 4:59 PM EDT	Special Weather Statement	RNK	City of Galax	31 min
Sep 28, 5:30 PM EDT	Special Weather Statement	RNK	City of Galax	30 min
Sep 28, 5:32 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	28 min
Sep 28, 5:59 PM EDT	Special Weather Statement	RNK	Smyth	46 min
Sep 28, 6:05 PM EDT	Special Weather Statement	RNK	Grayson	40 min
Sep 28, 12:32 AM EDT	Special Weather Statement	RNK	Stokes	28 min
Sep 28, 12:22 PM EDT	Special Weather Statement	RNK	Watauga	23 min
Sep 28, 4:03 PM EDT	Special Weather Statement	RNK	Watauga	27 min
Sep 28, 4:30 PM EDT	Special Weather Statement	RNK	Watauga	30 min
Sep 28, 5:43 PM EDT	Special Weather Statement	RNK	Ashe	32 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2019 Severe Thunderstorm Warnings in Virginia, 2019 Every severe thunderstorm warning in 2019

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.