Alert archive / Ohio / Mesoscale Discussions in 2017

Mesoscale Discussion 203

February 24, 20174 counties in Michigan; 5 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2017, 2:45 PM EST for 4 counties in Michigan; 5 counties in Ohio. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Feb 24, 2017, 2:45 PM EST (19:45 UTC)
Expired: Feb 24, 2017, 3:45 PM EST
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Lenawee County, MI, Monroe County, MI, Washtenaw County, MI, Wayne County, MI, Fulton County, OH, Henry County, OH, Lucas County, OH, Williams County, OH, Wood County, OH

The radar

The Detroit radar (KDTX), 100 km from the middle of the area, began a volume at 19:48 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, 7.8 hours before the alert went out and 103 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 400 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 761 m²/s²
0-3 km storm-relative helicity: 846 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 24, 3:07 PM EST	Mesoscale Discussion	SPC	Berrien, Branch, Calhoun, Cass, Hillsdale, Ingham and 5 more	2 hr
Feb 24, 3:44 PM EST	Severe Thunderstorm Watch	SPC	Branch, Calhoun, Eaton, Genesee, Hillsdale, Ingham and 14 more	6 hr
Feb 24, 5:56 PM EST	Mesoscale Discussion	SPC	Branch, Calhoun, Eaton, Genesee, Hillsdale, Ingham and 12 more	94 min
Feb 24, 6:03 PM EST	Mesoscale Discussion	SPC	Alcona, Alpena, Arenac, Bay, Clare, Crawford and 17 more	87 min
Feb 24, 6:36 PM EST	Severe Thunderstorm Watch	SPC	Adams, Ashland, Auglaize, Brown, Butler, Champaign and 46 more	6 hr

Nearby

Mesoscale Discussions in Ohio, 2017 Mesoscale Discussions in Michigan, 2017 Every mesoscale discussion in 2017

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.