Alert archive / Michigan / Mesoscale Discussions in 2009

Mesoscale Discussion 1249

June 19, 20096 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2009, 9:57 PM EDT for 6 counties in Michigan. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2009, 9:57 PM EDT (01:57 UTC)
Expired: Jun 19, 2009, 11:00 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Barry County, MI, Eaton County, MI, Ingham County, MI, Livingston County, MI, Oakland County, MI, Wayne County, MI

The radar

The Detroit radar (KDTX), 67 km from the middle of the area, began a volume at 01:57 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 00:00Z, 2.0 hours before the alert went out and 71 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: 655 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 231 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

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
Jun 19, 8:28 PM EDT	Mesoscale Discussion	SPC	Allegan, Barry, Calhoun, Jackson, Kalamazoo, Van Buren	92 min
Jun 19, 9:34 PM EDT	Mesoscale Discussion	SPC	Branch, Cass, Hillsdale, Saint Joseph	86 min

Nearby

Mesoscale Discussions in Michigan, 2009 Every mesoscale discussion in 2009

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.