Alert archive / Michigan / Mesoscale Discussions in 2013

Mesoscale Discussion 1652

August 7, 2013LaGrange County, Steuben County, Indiana; 33 counties in Michigan; Williams County, Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2013, 6:37 AM EDT for LaGrange County, Steuben County, Indiana; 33 counties in Michigan; Williams County, Ohio. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Aug 7, 2013, 6:37 AM EDT (10:37 UTC)
Expired
Aug 7, 2013, 8:30 AM EDT
In force
113 min
Issued by
the Storm Prediction Center
All 36 counties

LaGrange County, IN, Steuben County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Montcalm County, MI, Oakland County, MI, Ottawa County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Williams County, OH

The radar

The Detroit radar (KDTX), 77 km from the middle of the area, began a volume at 10:40 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

Alpena, MI (KAPX), launched 00:00Z, 10.6 hours before the alert went out and 326 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-pSkew-T log-p diagram, Alpena, MI at 00:00Z on 2013-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 568 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Alpena, MI at 00:00Z on 2013-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
568 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
973 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
141 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.5

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.

IssuedProductOfficeCountiesLasted
Aug 7, 8:52 AM EDTMesoscale DiscussionSPCAdams, Allen, Cass, DeKalb, Elkhart, Fulton and 18 more113 min
Aug 7, 2:46 PM EDTMesoscale DiscussionSPCAllen, Benton, Cass, DeKalb, Elkhart, Fulton and 16 more119 min
Aug 7, 2:12 AM EDTMesoscale DiscussionSPCAntrim, Benzie, Clare, Crawford, Grand Traverse, Gratiot and 16 more63 min
Aug 7, 2:29 AM EDTSevere Thunderstorm WatchSPCAlcona, Alpena, Antrim, Arenac, Bay, Benzie and 30 more5 hr
Aug 7, 11:20 AM EDTMesoscale DiscussionSPCAshland, Ashtabula, Carroll, Columbiana, Crawford, Cuyahoga and 22 more85 min
Aug 7, 3:24 PM EDTMesoscale DiscussionSPCBelmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more66 min
Aug 7, 3:49 PM EDTSevere Thunderstorm WatchSPCBelmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 2 more6 hr

Nearby

Mesoscale Discussions in Michigan, 2013Mesoscale Discussions in Indiana, 2013Mesoscale Discussions in Ohio, 2013Every mesoscale discussion in 2013

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.