Alert archive / Virginia / Mesoscale Discussions in 2016

Mesoscale Discussion 1077

June 28, 20165 states

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2016, 7:16 PM EDT for 5 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2016, 7:16 PM EDT (23:16 UTC)
Expired: Jun 28, 2016, 8:15 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

All 64 counties

Kent County, DE, New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Talbot County, MD, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA, Schuylkill County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Manassas, VA, City of Manassas Park, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, King George County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Orange County, VA, Prince William County, VA, Spotsylvania County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 90 km from the middle of the area, began a volume at 23:15 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, 11.3 hours before the alert went out and 84 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: 341 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -39 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 4:09 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle	7 hr
Jun 28, 3:49 PM EDT	Mesoscale Discussion	SPC	Baltimore, Carroll, Cecil, Frederick, Harford, Howard and 3 more	56 min
Jun 28, 1:09 PM EDT	Mesoscale Discussion	SPC	Bradford, Carbon, Clinton, Columbia, Lackawanna, Luzerne and 11 more	66 min

Nearby

Mesoscale Discussions in Virginia, 2016 Mesoscale Discussions in Pennsylvania, 2016 Mesoscale Discussions in Maryland, 2016 Every mesoscale discussion in 2016

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.