Alert archive / Michigan / Mesoscale Discussions in 2013
Mesoscale Discussion 1807
The Storm Prediction Center issued this mesoscale discussion at Aug 30, 2013, 5:14 PM CDT for 5 states. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Aug 30, 2013, 5:14 PM CDT (22:14 UTC)
- Expired
- Aug 30, 2013, 6:15 PM CDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
All 71 counties
Clinton County, IA, Dubuque County, IA, Jackson County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Lake County, IN, LaPorte County, IN, Porter County, IN, Saint Joseph County, IN, Allegan County, MI, Barry County, MI, Bay 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, Huron County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ottawa County, MI, Saginaw County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI
The radar
The Grand Rapids radar (KGRR), 91 km from the middle of the area, began a volume at 22:17 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.2 hours before the alert went out and 216 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
- 1815 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 723 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 218 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 12.5
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 |
|---|---|---|---|---|
| Aug 30, 12:24 PM CDT | Mesoscale Discussion | SPC | Boone, Lake, McHenry, Stephenson, Winnebago | 2 hr |
| Aug 30, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 14 more | 7 hr |
| Aug 29, 7:30 PM CDT | Mesoscale Discussion | SPC | Gogebic | 90 min |
| Aug 29, 11:57 PM CDT | Mesoscale Discussion | SPC | Gogebic | 93 min |
| Aug 29, 8:20 PM CDT | Tornado Watch | SPC | Ashland, Barron, Bayfield, Brown, Burnett, Calumet and 30 more | 5 hr |
Nearby
Mesoscale Discussions in Michigan, 2013Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Wisconsin, 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.