Alert archive / Michigan / Mesoscale Discussions in 2009
Mesoscale Discussion 2039
The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2009, 10:14 PM EDT for 5 counties in Indiana; 15 counties in Michigan. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 27, 2009, 10:14 PM EDT (02:14 UTC)
- Expired
- Sep 28, 2009, 12:15 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Elkhart County, IN, LaGrange County, IN, Marshall County, IN, Noble County, IN, Saint Joseph County, IN, Allegan County, MI, Barry County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ionia County, MI, Kalamazoo County, MI, Kent County, MI, Montcalm County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI
The radar
The Grand Rapids radar (KGRR), 40 km from the middle of the area, began a volume at 02:15 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 2.2 hours before the alert went out and 187 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1219 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 231 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 |
|---|---|---|---|---|
| Sep 27, 9:22 PM EDT | Tornado Watch | SPC | Benton, Jasper, Lake, Newton, Porter | 3 hr |
| Sep 27, 10:46 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more | 4 hr |
| Sep 28, 12:04 AM EDT | Mesoscale Discussion | SPC | Benton, Boone, Clinton, Delaware, Fayette, Fountain and 19 more | 86 min |
| Sep 28, 12:21 AM EDT | Severe Thunderstorm Watch | SPC | Bartholomew, Boone, Brown, Carroll, Clay, Clinton and 37 more | 3 hr |
| Sep 28, 2:25 AM EDT | Mesoscale Discussion | SPC | Dearborn, Franklin, Jennings, Ohio, Ripley, Union | 65 min |
Nearby
Mesoscale Discussions in Michigan, 2009Mesoscale Discussions in Indiana, 2009Every 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.