Alert archive / Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 1314

June 29, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2012, 7:51 PM EDT for 5 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Jun 29, 2012, 7:51 PM EDT (23:51 UTC)
Expired
Jun 29, 2012, 9:45 PM EDT
In force
114 min
Issued by
the Storm Prediction Center
All 138 counties

Breathitt County, KY, Floyd County, KY, Johnson County, KY, Knott County, KY, Magoffin County, KY, Martin County, KY, Pike County, KY, Wolfe County, KY, Allegany County, MD, Frederick County, MD, Garrett County, MD, Montgomery County, MD, Washington County, MD, Adams County, PA, Bedford County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Somerset County, PA, Washington County, PA, Albemarle County, VA, Alleghany County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Brunswick County, VA, Buchanan County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Colonial Heights, VA, City of Covington, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Hopewell, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Petersburg, VA, City of Radford, VA, City of Richmond, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Craig County, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Giles County, VA, Goochland County, VA, Greene County, VA, Hanover County, VA, Henrico County, VA, Highland County, VA, King George County, VA, Loudoun County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Nottoway County, VA, Orange County, VA, Page County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince William County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Tazewell County, VA, Warren County, VA, Barbour County, WV, Berkeley County, WV, Boone County, WV, Braxton County, WV, Clay County, WV, Fayette County, WV, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, McDowell County, WV, Mercer County, WV, Mineral County, WV, Mingo County, WV, Monongalia County, WV, Monroe County, WV, Morgan County, WV, Nicholas County, WV, Pendleton County, WV, Pocahontas County, WV, Preston County, WV, Raleigh County, WV, Randolph County, WV, Summers County, WV, Taylor County, WV, Tucker County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 169 km from the middle of the area, began a volume at 23:54 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 11.9 hours before the alert went out and 164 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, Roanoke, VA at 12:00Z on 2012-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 238 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, Roanoke, VA at 12:00Z on 2012-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.193958Sfc1 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
238 J/kg
Mixed-layer CIN
-630 J/kg
Mixed-layer LCL
1902 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
113 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 29, 2:01 PM EDTMesoscale DiscussionSPCBoone, Campbell, Gallatin, Kenton119 min
Jun 29, 3:02 PM EDTSevere Thunderstorm WatchSPCBoone, Boyd, Bracken, Campbell, Carter, Gallatin and 7 more5 hr
Jun 29, 4:22 PM EDTMesoscale DiscussionSPCBoone, Boyd, Bracken, Campbell, Carter, Fleming and 9 more83 min
Jun 29, 6:03 PM EDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Bracken, Campbell, Carter and 27 more87 min
Jun 29, 6:34 PM EDTSevere Thunderstorm WatchSPCLawrence6 hr
Jun 29, 4:34 AM EDTSevere Thunderstorm WatchSPCAnne Arundel, Baltimore, Caroline, Carroll, Cecil, Harford and 5 more3 hr
Jun 28, 8:53 PM EDTMesoscale DiscussionSPCErie97 min
Jun 29, 12:45 AM EDTMesoscale DiscussionSPCArmstrong, Blair, Butler, Cambria, Cameron, Centre and 18 more90 min
Jun 29, 3:41 AM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Columbia, Cumberland and 19 more94 min
Jun 29, 3:07 PM EDTMesoscale DiscussionSPCGreene, Washington53 min

Nearby

Mesoscale Discussions in Virginia, 2012Mesoscale Discussions in West Virginia, 2012Mesoscale Discussions in Kentucky, 2012Every mesoscale discussion in 2012

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.