Alert archive / Virginia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 20, NWS Blacksburg, VA

April 5, 20107 counties in Virginia; Greenbrier County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Apr 5, 2010, 11:53 PM EDT for 7 counties in Virginia; Greenbrier County, Monroe County, Summers County, West Virginia. It was in force for 52 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 5, 2010, 11:53 PM EDT (03:53 UTC)
Expired: Apr 6, 2010, 12:45 AM EDT
In force: 52 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Alleghany County, VA, Bath County, VA, Botetourt County, VA, City of Covington, VA, City of Lexington, VA, Craig County, VA, Rockbridge County, VA, Greenbrier County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 82 km from the middle of the area, began a volume at 03:55 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, 3.9 hours before the alert went out and 78 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, 45 minutes earlier.

Area forecast discussion, Apr 5, 11:08 PM EDT, 45 minutes before

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Hazardous weather outlook, Apr 5, 6:31 AM EDT, 17 hours 22 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

Special weather statement, Apr 5, 9:32 PM EDT, 2 hours 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
932 PM EDT MON APR 5 2010

NCZ005-006-060230-
CASWELL NC-ROCKINGHAM NC-
932 PM EDT MON APR 5 2010

...A STRONG THUNDERSTORM WILL AFFECT CASWELL AND ROCKINGHAM
COUNTIES...

AT 931 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 6 MILES SOUTHWEST
OF WENTWORTH...MOVING EAST AT 30 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO PENNY SIZE ARE POSSIBLE WITH THIS
STORM.

THIS STORM WILL BE NEAR WENTWORTH AROUND 940 PM...MONROETON AROUND
945 PM...REIDSVILLE...AND HARRISONS CROSSROADS AROUND 950 PM...
LAWSONVILLE AROUND 1000 PM...CAMP SPRINGS...AND QUICK AROUND 1010 PM
AND JERICHO AROUND 1020 PM.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR LATER
UPDATES OR POSSIBLE WARNINGS.

LAT...LON 3623 7918 3623 7938 3624 7939 3623 7967
      3626 7997 3644 7996 3645 7914 3643 7915
      3623 7916 3623 7917

EXPERIMENTAL

JH

Local storm report, Apr 5, 10:27 PM EDT, 1 hour 26 minutes before

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Local storm report, Apr 5, 10:51 PM EDT, 1 hour 2 minutes before

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Local storm report, Apr 5, 11:02 PM EDT, 51 minutes before

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Special weather statement, Apr 5, 11:16 PM EDT, 37 minutes before

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Special weather statement, Apr 5, 11:29 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
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, 11:56 PM EDT	Severe Thunderstorm Warning	RNK	Giles	79 min
Apr 6, 12:42 AM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Bedford, Botetourt, Craig, Roanoke, Rockbridge	33 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 Severe Thunderstorm Warnings in West 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.