Alert archive / Ohio / Mesoscale Discussions in 2012

Mesoscale Discussion 1343

July 1, 2012Lenawee County, Monroe County, Michigan; 22 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2012, 5:19 PM EDT for Lenawee County, Monroe County, Michigan; 22 counties in Ohio. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2012, 5:19 PM EDT (21:19 UTC)
Expired: Jul 1, 2012, 6:15 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 24 counties

Lenawee County, MI, Monroe County, MI, Ashland County, OH, Crawford County, OH, Erie County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Holmes County, OH, Huron County, OH, Lorain County, OH, Lucas County, OH, Medina County, OH, Morrow County, OH, Ottawa County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Wayne County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Cleveland radar (KCLE), 79 km from the middle of the area, began a volume at 21:22 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 447Jul 1, 5:40 PM EDT

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 9.3 hours before the alert went out and 172 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: 2 J/kg
Mixed-layer CIN: -291 J/kg
Mixed-layer LCL: 1587 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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
Jul 1, 1:16 PM EDT	Severe Thunderstorm Watch	SPC	Berrien, Cass	6 hr
Jul 1, 6:47 PM EDT	Mesoscale Discussion	SPC	Monroe	58 min
Jul 1, 3:56 PM EDT	Mesoscale Discussion	SPC	Allen, Athens, Auglaize, Champaign, Clark, Clinton and 36 more	94 min
Jul 1, 4:32 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Belmont, Carroll, Clinton, Columbiana, Coshocton and 28 more	6 hr
Jul 1, 5:40 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Crawford, Cuyahoga, Erie, Geauga, Hancock and 19 more	4 hr
Jul 1, 5:45 PM EDT	Mesoscale Discussion	SPC	Athens, Champaign, Clark, Clinton, Darke, Delaware and 20 more	60 min
Jul 1, 5:59 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Butler, Clermont, Hamilton, Scioto	5 hr
Jul 1, 7:22 PM EDT	Mesoscale Discussion	SPC	Carroll, Columbiana, Geauga, Harrison, Jefferson, Mahoning and 4 more	83 min

Nearby

Mesoscale Discussions in Ohio, 2012 Mesoscale Discussions in Michigan, 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.