Alert archive / Virginia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 207, NWS Blacksburg, VA

July 25, 20094 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 25, 2009, 9:16 PM EDT for 4 counties in Virginia. It was in force for 59 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 25, 2009, 9:16 PM EDT (01:16 UTC)
Expired: Jul 25, 2009, 10:15 PM EDT
In force: 59 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Amherst County, VA, City of Buena Vista, VA, City of Lexington, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 113 km from the middle of the area, began a volume at 01:17 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.3 hours before the alert went out and 217 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: 754 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1179 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.1

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 25, 7:54 PM EDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jul 25, 7:54 PM EDT, 1 hour 22 minutes before

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Hazardous weather outlook, Jul 25, 4:07 AM EDT, 17 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
407 AM EDT SAT JUL 25 2009

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-260815-
ASHE-ALLEGHANY NC-SURRY-STOKES-ROCKINGHAM-CASWELL-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-PITTSYLVANIA-CAMPBELL-
APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-MERCER-SUMMERS-MONROE-
GREENBRIER-
407 AM EDT SAT JUL 25 2009

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...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

A COLD FRONT WILL MOVE THROUGH THE AREA SUNDAY...TRIGGERING
SCATTERED THUNDERSTORMS. WHILE WIDESPREAD SEVERE WEATHER IS NOT
EXPECTED AT THIS TIME...ISOLATED STORMS MAY BRING DAMAGING WINDS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Local storm report, Jul 25, 8:15 PM EDT, 1 hour 1 minute before

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Local storm report, Jul 25, 8:22 PM EDT, 54 minutes before

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Local storm report, Jul 25, 8:46 PM EDT, 30 minutes before

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Special weather statement, Jul 25, 8:47 PM EDT, 29 minutes before

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Special weather statement, Jul 25, 8:56 PM EDT, 20 minutes before

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Special weather statement, Jul 25, 9:06 PM EDT, 10 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 25, 8:16 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bath, Botetourt, City of Covington	59 min
Jul 25, 8:30 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles, Tazewell	90 min
Jul 25, 8:47 PM EDT	Special Weather Statement	RNK	Botetourt	58 min
Jul 25, 8:56 PM EDT	Special Weather Statement	RNK	Bland, Tazewell	64 min
Jul 25, 9:06 PM EDT	Special Weather Statement	RNK	Amherst, Rockbridge, City of Buena Vista, City of Lexington	84 min
Jul 25, 9:34 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Smyth, Wythe	33 min
Jul 25, 10:39 PM EDT	Special Weather Statement	RNK	Montgomery, City of Radford	66 min
Jul 26, 9:59 AM EDT	Flash Flood Watch	RNK	Tazewell	4 hr
Jul 26, 1:12 PM EDT	Special Weather Statement	RNK	Patrick	63 min
Jul 26, 1:23 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Patrick	54 min
Jul 26, 1:32 PM EDT	Special Weather Statement	RNK	Bedford	58 min
Jul 26, 1:40 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Campbell, Franklin, Henry, Pittsylvania	65 min
Jul 26, 2:05 PM EDT	Severe Thunderstorm Warning	RNK	Henry, Pittsylvania, City of Martinsville	42 min
Jul 26, 2:15 PM EDT	Severe Thunderstorm Warning	RNK	Appomattox, Campbell, Charlotte, Halifax	75 min
Jul 26, 2:35 AM EDT	Special Weather Statement	RNK	Greenbrier, Monroe, Summers	55 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.