Alert archive / Pennsylvania / Mesoscale Discussions in 2011

Mesoscale Discussion 624

April 27, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2011, 1:24 PM EDT for 5 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 27, 2011, 1:24 PM EDT (17:24 UTC)
Expired: Apr 27, 2011, 3:00 PM EDT
In force: 96 min
Issued by: the Storm Prediction Center

All 81 counties

Allegany County, MD, Garrett County, MD, Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Livingston County, NY, Steuben County, NY, Wyoming County, NY, Ashtabula County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Mahoning County, OH, Monroe County, OH, Noble County, OH, Portage County, OH, Stark County, OH, Trumbull County, OH, Tuscarawas County, OH, Washington County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Fayette County, PA, Forest County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Mifflin County, PA, Potter County, PA, Somerset County, PA, Tioga County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Brooke County, WV, Doddridge County, WV, Gilmer County, WV, Grant County, WV, Hancock County, WV, Harrison County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Randolph County, WV, Ritchie County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wetzel County, WV, Wirt County, WV

The radar

The Pittsburgh radar (KPBZ), 108 km from the middle of the area, began a volume at 17:24 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

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
Apr 27, 1:23 PM EDT	Tornado Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more	5 hr
Apr 27, 3:10 PM EDT	Tornado Watch	SPC	Garrett	7 hr
Apr 27, 3:55 PM EDT	Mesoscale Discussion	SPC	Caroline, Cecil, Dorchester, Harford, Kent, Queen Anne's and 3 more	65 min
Apr 27, 4:39 PM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 10 more	66 min
Apr 27, 6:00 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 9 more	60 min
Apr 27, 6:15 PM EDT	Tornado Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more	6 hr
Apr 27, 6:50 PM EDT	Mesoscale Discussion	SPC	Carroll, Harford, Washington	55 min
Apr 27, 7:55 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Harford and 8 more	65 min
Apr 26, 8:33 PM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Darke, Defiance, Fulton, Henry and 6 more	57 min
Apr 26, 9:35 PM EDT	Mesoscale Discussion	SPC	Preble	55 min
Apr 27, 9:39 AM EDT	Mesoscale Discussion	SPC	Adams, Ashland, Athens, Belmont, Champaign, Clark and 36 more	66 min
Apr 27, 5:38 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Gallia, Lawrence, Scioto	37 min
Apr 27, 5:44 PM EDT	Tornado Watch	SPC	Athens, Gallia, Jackson, Lawrence, Meigs, Morgan and 3 more	7 hr
Apr 27, 7:22 PM EDT	Tornado Watch	SPC	Adams, Allen, Auglaize, Brown, Butler, Champaign and 36 more	8 hr
Apr 27, 3:22 PM EDT	Mesoscale Discussion	SPC	McDowell, Mingo	83 min

Nearby

Mesoscale Discussions in Pennsylvania, 2011 Mesoscale Discussions in West Virginia, 2011 Mesoscale Discussions in Ohio, 2011 Every mesoscale discussion in 2011

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.