Alert archive / Virginia / Mesoscale Discussions in 2007

Mesoscale Discussion 934

May 31, 20074 states

The Storm Prediction Center issued this mesoscale discussion at May 31, 2007, 2:01 PM EDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: May 31, 2007, 2:01 PM EDT (18:01 UTC)
Expired: May 31, 2007, 3:30 PM EDT
In force: 89 min
Issued by: the Storm Prediction Center

All 56 counties

Allegany County, MD, Carroll County, MD, Frederick County, MD, Washington County, MD, Adams County, PA, Fulton County, PA, York County, PA, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Radford, 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, Fauquier County, VA, Frederick County, VA, Giles County, VA, Greene County, VA, Highland County, VA, Loudoun County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Page County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Monroe County, WV, Morgan County, WV, Pendleton County, WV, Pocahontas County, WV

The radar

The Sterling radar (KLWX), 84 km from the middle of the area, began a volume at 18:04 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 12:00Z, 6.0 hours before the alert went out and 91 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: 21 J/kg
Mixed-layer CIN: -250 J/kg
Mixed-layer LCL: 1267 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 0 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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Nearby

Mesoscale Discussions in Virginia, 2007 Mesoscale Discussions in West Virginia, 2007 Mesoscale Discussions in Maryland, 2007 Every mesoscale discussion 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.