Alert archive / Ohio / Mesoscale Discussions in 2012

Mesoscale Discussion 1298

June 28, 20126 counties in Michigan; 11 counties in Ohio; Erie County, Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2012, 8:53 PM EDT for 6 counties in Michigan; 11 counties in Ohio; Erie County, Pennsylvania. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2012, 8:53 PM EDT (00:53 UTC)
Expired: Jun 28, 2012, 10:30 PM EDT
In force: 97 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Washtenaw County, MI, Wayne County, MI, Ashtabula County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Medina County, OH, Ottawa County, OH, Summit County, OH, Erie County, PA

The radar

The Cleveland radar (KCLE), 82 km from the middle of the area, began a volume at 00:57 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

Detroit, MI (KDTX), launched 00:00Z, 0.9 hours before the alert went out and 117 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: 4178 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1415 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 7.0

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
Jun 29, 10:22 AM EDT	Mesoscale Discussion	SPC	Darke, Mercer	2 hr
Jun 29, 11:49 AM EDT	Severe Thunderstorm Watch	SPC	Allen, Paulding, Putnam, Van Wert	6 hr
Jun 29, 2:01 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Auglaize, Brown, Butler, Champaign and 41 more	119 min
Jun 29, 3:02 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Ashland, Athens, Auglaize, Belmont, Brown and 57 more	5 hr
Jun 29, 3:07 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Athens, Auglaize, Belmont, Brown and 58 more	53 min
Jun 29, 4:22 PM EDT	Mesoscale Discussion	SPC	Adams, Ashland, Athens, Belmont, Brown, Butler and 54 more	83 min
Jun 29, 6:03 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Belmont, Brown, Clermont, Coshocton and 21 more	87 min
Jun 29, 12:45 AM EDT	Mesoscale Discussion	SPC	Armstrong, Blair, Butler, Cambria, Cameron, Centre and 18 more	90 min
Jun 29, 3:41 AM EDT	Mesoscale Discussion	SPC	Berks, Bucks, Carbon, Chester, Columbia, Cumberland and 19 more	94 min
Jun 29, 4:34 AM EDT	Severe Thunderstorm Watch	SPC	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jun 29, 6:34 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Bedford, Fayette, Franklin, Fulton, Greene and 3 more	6 hr
Jun 29, 7:51 PM EDT	Mesoscale Discussion	SPC	Adams, Bedford, Fayette, Franklin, Fulton, Greene and 2 more	114 min

Nearby

Mesoscale Discussions in Ohio, 2012 Mesoscale Discussions in Michigan, 2012 Mesoscale Discussions in Pennsylvania, 2012 Every mesoscale discussion in 2012

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.