Alert archive / Virginia / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 143, NWS Blacksburg, VA

September 4, 2015Carroll County, Floyd County, Patrick County, Virginia; Stokes County, Surry County, Yadkin County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Sep 4, 2015, 6:50 PM EDT for Carroll County, Floyd County, Patrick County, Virginia; Stokes County, Surry County, Yadkin County, North Carolina. 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 counties it named.

The facts

Issued: Sep 4, 2015, 6:50 PM EDT (22:50 UTC)
Expired: Sep 4, 2015, 7:45 PM EDT
In force: 55 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Stokes County, NC, Surry County, NC, Yadkin County, NC, Carroll County, VA, Floyd County, VA, Patrick County, VA

The radar

The Roanoke radar (KFCX), 56 km from the middle of the area, began a volume at 22:51 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.8 hours before the alert went out and 75 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: 760 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1288 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 15 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 Sep 4, 6:22 PM EDT, 28 minutes earlier.

Area forecast discussion, Sep 4, 6:22 PM EDT, 28 minutes before

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Hazardous weather outlook, Sep 4, 4:15 PM EDT, 2 hours 35 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
415 PM EDT FRI SEP 4 2015

NCZ001-002-018-019-VAZ007-009>020-022>024-WVZ042>044-507-508-052015-
ASHE-ALLEGHANY NC-WATAUGA-WILKES-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-
PULASKI-MONTGOMERY-GRAYSON-CARROLL-FLOYD-CRAIG-ALLEGHANY VA-BATH-
ROANOKE-BOTETOURT-ROCKBRIDGE-MERCER-SUMMERS-MONROE-
EASTERN GREENBRIER-WESTERN GREENBRIER-
415 PM EDT FRI SEP 4 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST NORTH
CAROLINA...SOUTHWEST VIRGINIA...WEST CENTRAL VIRGINIA AND SOUTHEAST
WEST VIRGINIA.

.DAY ONE...TONIGHT.

A FEW THUNDERSTORMS THROUGH EARLY EVENING COULD PRODUCE FREQUENT
CLOUD TO GROUND LIGHTNING...TORRENTIAL DOWNPOURS...GUSTY WINDS AND
SMALL HAIL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER LOW AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ003>006-020-VAZ032>035-043>047-058-059-052015-
SURRY-STOKES-ROCKINGHAM-CASWELL-YADKIN-PATRICK-FRANKLIN-BEDFORD-
AMHERST-HENRY-PITTSYLVANIA-CAMPBELL-APPOMATTOX-BUCKINGHAM-HALIFAX-
CHARLOTTE-
415 PM EDT FRI SEP 4 2015

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...TONIGHT.

THUNDERSTORMS THROUGH EARLY EVENING COULD BE STRONG TO SEVERE WITH
LARGE HAIL AND DAMAGING WINDS THE MAIN THREAT. FREQUENT CLOUD TO
GROUND LIGHTNING...AND TORRENTIAL DOWNPOURS WILL ALSO OCCUR WITH
THE STORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER LOW AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Sep 4, 6:03 PM EDT, 47 minutes before

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Special weather statement, Sep 4, 6:03 PM EDT, 47 minutes before

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Local storm report, Sep 4, 6:09 PM EDT, 41 minutes before

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Local storm report, Sep 4, 6:11 PM EDT, 39 minutes before

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Special weather statement, Sep 4, 6:18 PM EDT, 32 minutes before

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Local storm report, Sep 4, 6:26 PM EDT, 24 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
Sep 3, 9:02 PM EDT	Special Weather Statement	RNK	Charlotte	58 min
Sep 4, 1:01 PM EDT	Special Weather Statement	RNK	Rockbridge	44 min
Sep 4, 2:22 PM EDT	Special Weather Statement	RNK	Pittsylvania, City of Danville	53 min
Sep 4, 2:33 PM EDT	Special Weather Statement	RNK	Campbell	72 min
Sep 4, 2:41 PM EDT	Special Weather Statement	RNK	Botetourt	64 min
Sep 4, 2:59 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Lexington	61 min
Sep 4, 3:08 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Botetourt, Craig, City of Covington	67 min
Sep 4, 3:12 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox, Campbell, Halifax, Pittsylvania	63 min
Sep 4, 3:21 PM EDT	Special Weather Statement	RNK	Halifax, City of Danville	54 min
Sep 4, 3:38 PM EDT	Special Weather Statement	RNK	Bedford, City of Buena Vista	67 min
Sep 4, 3:52 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania	53 min
Sep 4, 4:01 PM EDT	Special Weather Statement	RNK	Giles	59 min
Sep 4, 4:06 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania	54 min
Sep 4, 4:12 PM EDT	Special Weather Statement	RNK	Craig	63 min
Sep 4, 4:13 PM EDT	Special Weather Statement	RNK	Carroll, City of Galax	62 min
Sep 4, 4:23 PM EDT	Special Weather Statement	RNK	Tazewell	67 min
Sep 4, 4:41 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Botetourt, Craig, Franklin, Roanoke, City of Roanoke and 1 more	64 min
Sep 4, 4:46 PM EDT	Areal Flood Advisory	RNK	Halifax	6 hr
Sep 4, 4:47 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Floyd, Patrick	44 min
Sep 4, 4:49 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Franklin, Pittsylvania	56 min
Sep 4, 5:04 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Montgomery, Patrick, Roanoke, City of Roanoke and 1 more	56 min
Sep 4, 5:11 PM EDT	Areal Flood Advisory	RNK	Botetourt, Roanoke, City of Roanoke, City of Salem	6 hr
Sep 4, 5:15 PM EDT	Special Weather Statement	RNK	Bland	60 min
Sep 4, 5:46 PM EDT	Special Weather Statement	RNK	Buckingham	59 min
Sep 4, 5:57 PM EDT	Severe Thunderstorm Warning	RNK	Carroll, Floyd, Franklin, Montgomery, Patrick, Roanoke	63 min
Sep 4, 6:03 PM EDT	Special Weather Statement	RNK	Grayson	27 min
Sep 4, 6:18 PM EDT	Special Weather Statement	RNK	Carroll	57 min
Sep 4, 6:54 PM EDT	Special Weather Statement	RNK	Carroll	36 min
Sep 4, 7:02 PM EDT	Special Weather Statement	RNK	Grayson	58 min
Sep 4, 7:23 PM EDT	Special Weather Statement	RNK	City of Galax	67 min
Sep 4, 2:37 PM EDT	Special Weather Statement	RNK	Watauga	68 min
Sep 4, 3:03 PM EDT	Special Weather Statement	RNK	Caldwell	27 min
Sep 4, 4:25 PM EDT	Special Weather Statement	RNK	Ashe, Watauga	65 min
Sep 4, 4:30 PM EDT	Special Weather Statement	RNK	Surry	60 min
Sep 4, 4:44 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham, Stokes, Yadkin	61 min
Sep 4, 5:00 PM EDT	Severe Thunderstorm Warning	RNK	Ashe, Watauga	46 min
Sep 4, 7:25 PM EDT	Special Weather Statement	RNK	Wilkes	65 min
Sep 4, 1:44 PM EDT	Special Weather Statement	RNK	Greenbrier	31 min
Sep 4, 3:17 PM EDT	Special Weather Statement	RNK	Greenbrier	58 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2015 Severe Thunderstorm Warnings in North Carolina, 2015 Every severe thunderstorm warning in 2015

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.