Alert archive / Virginia / Mesoscale Discussions in 2014

Mesoscale Discussion 1263

July 3, 20145 states

The Storm Prediction Center issued this mesoscale discussion at Jul 3, 2014, 3:41 PM EDT for 5 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jul 3, 2014, 3:41 PM EDT (19:41 UTC)
Expired: Jul 3, 2014, 4:45 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

All 79 counties

Carroll County, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Washington County, MD, Broome County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Fulton County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Otsego County, NY, Schoharie County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Adams County, PA, Berks County, PA, Bradford County, PA, Carbon County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Juniata County, PA, Lackawanna County, PA, Lebanon County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Monroe County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA, Albemarle County, VA, Appomattox County, VA, Arlington County, VA, Buckingham County, VA, Campbell County, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Frederick County, VA, Greene County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Jefferson County, WV, Morgan County, WV

The radar

The State College radar (KCCX), 131 km from the middle of the area, began a volume at 19:40 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.7 hours before the alert went out and 98 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: 704 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 954 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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.

Issued	Product	Office	Counties	Lasted
Jul 3, 11:57 AM EDT	Mesoscale Discussion	SPC	Allegany, Baltimore, Carroll, Frederick, Garrett, Harford and 4 more	63 min
Jul 3, 12:52 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Anne Arundel, Baltimore, Carroll, Charles, Frederick and 6 more	8 hr
Jul 3, 2:12 PM EDT	Severe Thunderstorm Watch	SPC	Caroline, Cecil, Kent, Queen Anne's, Talbot	10 hr
Jul 3, 7:59 PM EDT	Mesoscale Discussion	SPC	Caroline, Cecil	2 hr
Jul 3, 1:30 PM EDT	Mesoscale Discussion	SPC	Albany, Columbia, Dutchess, Fulton, Greene, Montgomery and 11 more	3 hr
Jul 3, 4:55 PM EDT	Mesoscale Discussion	SPC	Albany, Bronx, Columbia, Dutchess, Essex, Fulton and 19 more	2 hr

Nearby

Mesoscale Discussions in Virginia, 2014 Mesoscale Discussions in Pennsylvania, 2014 Mesoscale Discussions in New York, 2014 Every mesoscale discussion in 2014

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.