Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 911

May 23, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 8:07 PM EDT for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 23, 2011, 8:07 PM EDT (00:07 UTC)
Expired: May 23, 2011, 9:30 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center

All 38 counties

Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Livingston County, NY, Wyoming County, NY, Ashtabula County, OH, Carroll County, OH, Columbiana County, OH, Cuyahoga County, OH, Geauga County, OH, Holmes County, OH, Jefferson County, OH, Lake County, OH, Mahoning County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Wayne County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Forest County, PA, Jefferson County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Venango County, PA, Warren County, PA, Brooke County, WV, Hancock County, WV

The radar

The Pittsburgh radar (KPBZ), 125 km from the middle of the area, began a volume at 00:07 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.

Severe Thunderstorm Watch 349May 23, 8:30 PM EDT

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 0.1 hours before the alert went out and 136 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: 369 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1384 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.2

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
May 24, 1:34 PM EDT	Mesoscale Discussion	SPC	Albany, Bronx, Broome, Chenango, Columbia, Delaware and 23 more	116 min
May 23, 8:31 PM EDT	Severe Thunderstorm Watch	SPC	Ashtabula, Athens, Belmont, Carroll, Columbiana, Coshocton and 24 more	3 hr
May 24, 2:11 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Crawford, Hancock, Hardin and 17 more	94 min
May 24, 8:34 AM EDT	Mesoscale Discussion	SPC	Greenbrier, Logan, McDowell, Mercer, Mingo, Monroe and 3 more	116 min
May 24, 10:00 AM EDT	Severe Thunderstorm Watch	SPC	Greenbrier, Mercer, Monroe, Summers	7 hr
May 24, 1:57 PM EDT	Severe Thunderstorm Watch	SPC	McDowell	6 hr
May 24, 4:27 PM EDT	Mesoscale Discussion	SPC	McDowell	63 min
May 24, 7:33 PM EDT	Mesoscale Discussion	SPC	McDowell	57 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Pennsylvania, 2011 Mesoscale Discussions in New York, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.