Alert archive / Michigan / Mesoscale Discussions in 2011

Mesoscale Discussion 857

May 22, 2011Steuben County, Indiana; 31 counties in Michigan; Fulton County, Lucas County, Williams County, Ohio

The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 3:15 PM EDT for Steuben County, Indiana; 31 counties in Michigan; Fulton County, Lucas County, Williams County, Ohio. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 22, 2011, 3:15 PM EDT (19:15 UTC)
Expired: May 22, 2011, 4:15 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center

All 35 counties

Steuben County, IN, Alcona County, MI, Alpena County, MI, Arenac County, MI, Bay County, MI, Clinton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Iosco County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Midland County, MI, Monroe County, MI, Montmorency County, MI, Oakland County, MI, Ogemaw County, MI, Oscoda County, MI, Presque Isle County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Fulton County, OH, Lucas County, OH, Williams County, OH

The radar

The Detroit radar (KDTX), 55 km from the middle of the area, began a volume at 19:19 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 nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 7.3 hours before the alert went out and 55 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: 330 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 94 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
May 22, 2:18 PM EDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more	7 hr
May 22, 2:51 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Blackford, Boone, Brown and 37 more	54 min
May 22, 3:04 PM EDT	Tornado Watch	SPC	Benton, Jasper, Lake, Newton, Porter	9 hr
May 22, 5:16 PM EDT	Mesoscale Discussion	SPC	Allen, Benton, Boone, Carroll, Cass, Clinton and 30 more	119 min
May 22, 5:32 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Carroll, Cass, Clinton and 27 more	7 hr
May 22, 3:41 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Genesee, Huron, Lapeer, Lenawee, Livingston and 11 more	3 hr
May 22, 4:43 PM EDT	Tornado Watch	SPC	Baraga, Dickinson, Gogebic, Houghton, Iron, Marquette and 2 more	5 hr
May 22, 4:44 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Gallia, Jackson, Lawrence, Meigs and 3 more	61 min
May 22, 5:40 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Gallia, Jackson, Lawrence, Meigs, Morgan and 3 more	5 hr
May 22, 7:26 PM EDT	Mesoscale Discussion	SPC	Athens, Gallia, Hocking, Jackson, Lawrence, Meigs and 6 more	2 hr

Nearby

Mesoscale Discussions in Michigan, 2011 Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Indiana, 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.