Alert archive / Pennsylvania / Mesoscale Discussions in 2016

Mesoscale Discussion 1887

December 17, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Dec 17, 2016, 4:21 AM EST for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Dec 17, 2016, 4:21 AM EST (09:21 UTC)
Expired: Dec 17, 2016, 9:15 AM EST
In force: 5 hr
Issued by: the Storm Prediction Center

All 38 counties

New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Queen Anne's County, MD, Camden County, NJ, Essex County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Salem County, NJ, Somerset County, NJ, Union County, NJ, Warren County, NJ, Adams County, PA, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Schuylkill County, PA, York County, PA

The radar

The Dover AFB radar (KDOX), 133 km from the middle of the area, began a volume at 09:20 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 text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 17, 3:08 AM EST	Mesoscale Discussion	SPC	Allegany, Washington	4 hr
Dec 17, 6:57 AM EST	Mesoscale Discussion	SPC	Passaic, Sussex	5 hr
Dec 16, 11:42 PM EST	Mesoscale Discussion	SPC	Allegheny, Beaver, Greene, Lawrence, Washington	5 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2016 Mesoscale Discussions in Maryland, 2016 Mesoscale Discussions in New Jersey, 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; radar from the NEXRAD Level II archive.