Alert archive / Pennsylvania / Mesoscale Discussions in 2015

Mesoscale Discussion 89

February 21, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2015, 6:24 PM EST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Feb 21, 2015, 6:24 PM EST (23:24 UTC)
Expired: Feb 21, 2015, 10:30 PM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 23 counties

Baltimore County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Hunterdon County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, York County, PA, Fauquier County, VA, Loudoun County, VA

The radar

The Dover AFB radar (KDOX), 128 km from the middle of the area, began a volume at 23:26 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, 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
Feb 21, 4:20 AM EST	Mesoscale Discussion	SPC	Bland, Buchanan, Dickenson, Lee, Russell, Scott and 6 more	5 hr
Feb 21, 10:32 AM EST	Mesoscale Discussion	SPC	Alleghany, Amherst, Augusta, Bath, Bedford, Bland and 23 more	5 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2015 Mesoscale Discussions in Maryland, 2015 Mesoscale Discussions in New Jersey, 2015 Every mesoscale discussion in 2015

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.