Alert archive / Virginia / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 372

June 8, 20074 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 8, 2007, 5:32 PM EDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 8, 2007, 5:32 PM EDT (21:32 UTC)
Expired
Jun 8, 2007, 11:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 73 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Washington County, MD, Adams County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Union County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, Augusta County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 97 km from the middle of the area, began a volume at 21:34 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

39 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 8, 5:37 PM EDTSevere Thunderstorm WarningLWXHighland53 min
Jun 8, 5:46 PM EDTSevere Thunderstorm WarningLWXRockingham44 min
Jun 8, 6:03 PM EDTSevere Thunderstorm WarningLWXMontgomery42 min
Jun 8, 6:05 PM EDTSevere Thunderstorm WarningLWXGrant40 min
Jun 8, 6:18 PM EDTSevere Thunderstorm WarningLWXAugusta, Rockingham, City of Harrisonburg, City of Staunton, City of Waynesboro57 min
Jun 8, 6:30 PM EDTSevere Thunderstorm WarningLWXSpotsylvania, City of Fredericksburg45 min
Jun 8, 6:36 PM EDTSevere Thunderstorm WarningLWXHardy54 min
Jun 8, 6:44 PM EDTSevere Thunderstorm WarningLWXMontgomery30 min
Jun 8, 6:48 PM EDTSevere Thunderstorm WarningLWXOrange42 min
Jun 8, 6:53 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster46 min
Jun 8, 6:58 PM EDTSevere Thunderstorm WarningCTPYork62 min
Jun 8, 7:01 PM EDTSevere Thunderstorm WarningCTPFulton44 min
Jun 8, 7:10 PM EDTSevere Thunderstorm WarningLWXShenandoah18 min
Jun 8, 7:12 PM EDTSevere Thunderstorm WarningLWXAugusta, City of Staunton, City of Waynesboro38 min
Jun 8, 7:21 PM EDTSevere Thunderstorm WarningCTPHuntingdon39 min
Jun 8, 7:23 PM EDTSevere Thunderstorm WarningCTPFranklin67 min
Jun 8, 7:27 PM EDTSevere Thunderstorm WarningLWXWashington48 min
Jun 8, 7:41 PM EDTSevere Thunderstorm WarningLWXSpotsylvania49 min
Jun 8, 7:47 PM EDTSevere Thunderstorm WarningCTPJuniata, Mifflin28 min
Jun 8, 7:47 PM EDTSevere Thunderstorm WarningLWXLoudoun32 min
Jun 8, 7:48 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Nelson, City of Charlottesville57 min
Jun 8, 7:54 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland66 min
Jun 8, 7:57 PM EDTSevere Thunderstorm WarningLWXFrederick63 min
Jun 8, 7:57 PM EDTSevere Thunderstorm WarningCTPPerry63 min
Jun 8, 8:04 PM EDTSevere Thunderstorm WarningCTPLancaster56 min
Jun 8, 8:11 PM EDTSevere Thunderstorm WarningLWXMontgomery64 min
Jun 8, 8:14 PM EDTSevere Thunderstorm WarningCTPSnyder, Union61 min
Jun 8, 8:15 PM EDTSevere Thunderstorm WarningLWXWashington14 min
Jun 8, 8:18 PM EDTSevere Thunderstorm WarningLWXOrange57 min
Jun 8, 8:32 PM EDTSevere Thunderstorm WarningCTPJuniata28 min
Jun 8, 8:33 PM EDTSevere Thunderstorm WarningCTPDauphin, York72 min
Jun 8, 8:37 PM EDTSevere Thunderstorm WarningLWXCarroll40 min
Jun 8, 8:42 PM EDTSevere Thunderstorm WarningCTPNorthumberland63 min
Jun 8, 8:51 PM EDTSevere Thunderstorm WarningLWXPrince George's54 min
Jun 8, 9:11 PM EDTSevere Thunderstorm WarningCTPSchuylkill55 min
Jun 8, 9:17 PM EDTSevere Thunderstorm WarningCTPLebanon43 min
Jun 8, 9:23 PM EDTSevere Thunderstorm WarningCTPColumbia, Montour41 min
Jun 8, 9:40 PM EDTSevere Thunderstorm WarningLWXPrince George's31 min
Jun 8, 9:50 PM EDTSevere Thunderstorm WarningLWXAnne Arundel30 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.5 hours before the alert went out and 101 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2007-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 709 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2007-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
709 J/kg
Mixed-layer CIN
-176 J/kg
Mixed-layer LCL
1315 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 8, 4:12 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Carroll, Charles, Frederick and 7 more93 min
Jun 8, 7:48 PM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 4 more117 min
Jun 8, 12:37 PM EDTSevere Thunderstorm WatchSPCAllegheny, Beaver, Fayette, Greene, Washington, Westmoreland8 hr
Jun 8, 2:08 PM EDTMesoscale DiscussionSPCArmstrong, Butler, Cameron, Clarion, Clearfield, Crawford and 10 more97 min
Jun 8, 2:59 PM EDTSevere Thunderstorm WatchSPCArmstrong, Bedford, Blair, Bradford, Butler, Cambria and 22 more7 hr
Jun 8, 3:06 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Fayette, Greene, Washington, Westmoreland54 min
Jun 8, 12:02 PM EDTMesoscale DiscussionSPCBuchanan, Dickenson, Lee, Russell, Scott, Tazewell and 3 more58 min

Nearby

Severe Thunderstorm Watches in Virginia, 2007Severe Thunderstorm Watches in Pennsylvania, 2007Severe Thunderstorm Watches in Maryland, 2007Every severe thunderstorm watch in 2007

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.