Alert archive / Michigan / Mesoscale Discussions in 2012
Mesoscale Discussion 1658
The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2012, 12:39 AM CDT for Lake County, McHenry County, Illinois; 17 counties in Michigan; 6 counties in Wisconsin. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2012, 12:39 AM CDT (05:39 UTC)
- Expired
- Jul 31, 2012, 2:15 AM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 25 counties
Lake County, IL, McHenry County, IL, Allegan County, MI, Barry County, MI, Bay County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Kent County, MI, Midland County, MI, Montcalm County, MI, Ottawa County, MI, Saginaw County, MI, Shiawassee County, MI, Van Buren County, MI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Walworth County, WI, Waukesha County, WI
The radar
The Grand Rapids radar (KGRR), 59 km from the middle of the area, began a volume at 05:41 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, 5.7 hours before the alert went out and 233 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.
- Mixed-layer CAPE
- 30 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 2207 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 12:11 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 16 more | 64 min |
| Jul 31, 1:13 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 19 more | 6 hr |
| Jul 31, 3:35 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 16 more | 55 min |
| Jul 31, 6:42 PM CDT | Mesoscale Discussion | SPC | Crawford, Edwards, Jasper, Lawrence, Richland, Wabash and 1 more | 33 min |
Nearby
Mesoscale Discussions in Michigan, 2012Mesoscale Discussions in Wisconsin, 2012Mesoscale Discussions in Illinois, 2012Every mesoscale discussion in 2012
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.