Alert archive / Virginia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 22, NWS Blacksburg, VA

April 6, 20106 counties in Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Apr 6, 2010, 12:42 AM EDT for 6 counties in Virginia. It was in force for 33 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: Apr 6, 2010, 12:42 AM EDT (04:42 UTC)
Expired: Apr 6, 2010, 1:15 AM EDT
In force: 33 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Alleghany County, VA, Bedford County, VA, Botetourt County, VA, Craig County, VA, Roanoke County, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 68 km from the middle of the area, began a volume at 04:45 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, 4.7 hours before the alert went out and 47 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: 784 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1578 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

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 Apr 5, 11:08 PM EDT, 1 hour 34 minutes earlier.

Area forecast discussion, Apr 5, 11:08 PM EDT, 1 hour 34 minutes before

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Hazardous weather outlook, Apr 5, 6:31 AM EDT, 18 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
631 AM EDT MON APR 5 2010

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-061045-
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-
631 AM EDT MON APR 5 2010

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...TUESDAY THROUGH SUNDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Local storm report, Apr 5, 10:27 PM EDT, 2 hours 15 minutes before

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Local storm report, Apr 5, 10:51 PM EDT, 1 hour 51 minutes before

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Local storm report, Apr 5, 11:02 PM EDT, 1 hour 40 minutes before

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Special weather statement, Apr 5, 11:16 PM EDT, 1 hour 26 minutes before

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Special weather statement, Apr 5, 11:29 PM EDT, 1 hour 13 minutes before

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Local storm report, Apr 6, 12:36 AM EDT, 6 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
Apr 5, 8:19 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Craig, Giles	28 min
Apr 5, 10:19 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Botetourt, Craig, City of Covington	56 min
Apr 5, 11:29 PM EDT	Special Weather Statement	RNK	Botetourt	16 min
Apr 5, 11:53 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bath, Botetourt, Craig, Rockbridge, City of Covington and 1 more	52 min
Apr 5, 11:56 PM EDT	Severe Thunderstorm Warning	RNK	Giles	79 min
Apr 6, 1:16 AM EDT	Special Weather Statement	RNK	Craig	29 min
Apr 6, 1:17 AM EDT	Special Weather Statement	RNK	Amherst, Bedford, Campbell, City of Lynchburg	28 min
Apr 6, 1:44 AM EDT	Special Weather Statement	RNK	Appomattox, Buckingham, Campbell, Charlotte	61 min
Apr 6, 2:48 AM EDT	Special Weather Statement	RNK	Bath	57 min
Apr 5, 9:32 PM EDT	Special Weather Statement	RNK	Caswell, Rockingham	58 min
Apr 5, 9:33 PM EDT	Severe Thunderstorm Warning	RNK	Greenbrier, Summers	57 min
Apr 5, 10:36 PM EDT	Severe Thunderstorm Warning	RNK	Greenbrier	84 min
Apr 5, 11:16 PM EDT	Special Weather Statement	RNK	Monroe	29 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2010 Every severe thunderstorm warning in 2010

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.