Alert archive / Michigan / Mesoscale Discussions in 2015

Mesoscale Discussion 614

May 11, 20158 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at May 11, 2015, 3:46 PM EDT for 8 counties in Michigan. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: May 11, 2015, 3:46 PM EDT (19:46 UTC)
Expired: May 11, 2015, 5:45 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Arenac County, MI, Bay County, MI, Clare County, MI, Gladwin County, MI, Isabella County, MI, Midland County, MI, Ogemaw County, MI, Roscommon County, MI

The radar

The NCL Michigan radar (KAPX), 99 km from the middle of the area, began a volume at 19:47 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 12:00Z, 7.8 hours before the alert went out and 165 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: 204 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 837 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 91 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 11, 12:48 PM EDT	Mesoscale Discussion	SPC	Branch, Calhoun, Clinton, Eaton, Genesee, Hillsdale and 14 more	2 hr
May 11, 1:14 PM EDT	Tornado Watch	SPC	Branch, Genesee, Hillsdale, Huron, Ingham, Jackson and 13 more	7 hr
May 11, 4:39 PM EDT	Mesoscale Discussion	SPC	Genesee, Lapeer, Lenawee, Livingston, Macomb, Monroe and 6 more	66 min

Nearby

Mesoscale Discussions in Michigan, 2015 Every mesoscale discussion in 2015

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.