Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 651

April 28, 20115 counties in Michigan; 7 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2011, 12:51 AM EDT for 5 counties in Michigan; 7 counties in Ohio. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 28, 2011, 12:51 AM EDT (04:51 UTC)
Expired: Apr 28, 2011, 1:45 AM EDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Lenawee County, MI, Monroe County, MI, Oakland County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Lucas County, OH, Putnam County, OH, Wood County, OH

The radar

The Detroit radar (KDTX), 125 km from the middle of the area, began a volume at 04:53 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 4.9 hours before the alert went out and 245 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: 775 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 521 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

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
Apr 27, 9:22 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Auglaize, Brown, Butler, Champaign and 37 more	53 min
Apr 28, 3:19 AM EDT	Mesoscale Discussion	SPC	Ashland, Belmont, Carroll, Columbiana, Coshocton, Crawford and 22 more	56 min
Apr 28, 1:38 PM EDT	Mesoscale Discussion	SPC	Brown, Butler, Clermont, Hamilton, Montgomery, Preble and 1 more	97 min

Nearby

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