Alert archive / Virginia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 214, NWS Blacksburg, VA

July 28, 2009Bedford County, Campbell County, Pittsylvania County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 28, 2009, 7:20 PM EDT for Bedford County, Campbell County, Pittsylvania 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 counties it named.

The facts

Issued: Jul 28, 2009, 7:20 PM EDT (23:20 UTC)
Expired: Jul 28, 2009, 8:15 PM EDT
In force: 55 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Bedford County, VA, Campbell County, VA, Pittsylvania County, VA

The radar

The Roanoke radar (KFCX), 84 km from the middle of the area, began a volume at 23:23 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, 11.3 hours before the alert went out and 125 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: 1744 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: -76 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 28, 2:59 PM EDT, 4 hours 21 minutes earlier.

Area forecast discussion, Jul 28, 2:59 PM EDT, 4 hours 21 minutes before

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Hazardous weather outlook, Jul 28, 4:08 AM EDT, 15 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
408 AM EDT TUE JUL 28 2009

NCZ003>006-019-020-VAZ022>024-032>035-043>047-058-059-290815-
SURRY-STOKES-ROCKINGHAM-CASWELL-WILKES-YADKIN-ROANOKE-BOTETOURT-
ROCKBRIDGE-PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-PITTSYLVANIA-
CAMPBELL-APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-
408 AM EDT TUE JUL 28 2009

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.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ001-002-018-VAZ007-009>020-WVZ042>045-290815-
ASHE-ALLEGHANY NC-WATAUGA-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-
MONTGOMERY-GRAYSON-CARROLL-FLOYD-CRAIG-ALLEGHANY VA-BATH-MERCER-
SUMMERS-MONROE-GREENBRIER-
408 AM EDT TUE JUL 28 2009

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

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
HOWEVER...THE POTENTIAL FOR ISOLATED FLASH FLOODING EXISTS
WEDNESDAY AS A DISTURBANCE MOVES ACROSS. ISOLATED SEVERE
THUNDERSTORMS ARE ALSO POSSIBLE WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 28, 6:22 PM EDT, 58 minutes before

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Special weather statement, Jul 28, 6:30 PM EDT, 50 minutes before

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Special weather statement, Jul 28, 6:43 PM EDT, 37 minutes before

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Special weather statement, Jul 28, 6:45 PM EDT, 35 minutes before

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Special weather statement, Jul 28, 7:05 PM EDT, 15 minutes before

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Special weather statement, Jul 28, 7:16 PM EDT, 4 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 27, 9:16 PM EDT	Special Weather Statement	RNK	Charlotte	59 min
Jul 28, 5:45 PM EDT	Special Weather Statement	RNK	Appomattox	60 min
Jul 28, 6:07 PM EDT	Special Weather Statement	RNK	City of Galax	53 min
Jul 28, 6:22 PM EDT	Special Weather Statement	RNK	Wythe	53 min
Jul 28, 6:30 PM EDT	Special Weather Statement	RNK	Wythe	60 min
Jul 28, 6:43 PM EDT	Special Weather Statement	RNK	Pittsylvania	62 min
Jul 28, 7:05 PM EDT	Special Weather Statement	RNK	Pittsylvania	55 min
Jul 28, 7:16 PM EDT	Special Weather Statement	RNK	Amherst	59 min
Jul 28, 7:38 PM EDT	Special Weather Statement	RNK	Grayson	67 min
Jul 28, 12:58 AM EDT	Special Weather Statement	RNK	Caldwell	62 min
Jul 28, 5:36 PM EDT	Special Weather Statement	RNK	Alleghany	54 min
Jul 28, 6:45 PM EDT	Special Weather Statement	RNK	Alleghany	60 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2009 Every severe thunderstorm warning in 2009

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.