Alert archive / Michigan / Mesoscale Discussions in 2020
Mesoscale Discussion 1273
The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2020, 8:42 AM EDT for 33 counties in Michigan. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2020, 8:42 AM EDT (12:42 UTC)
- Expired
- Jul 19, 2020, 10:45 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
All 33 counties
Arenac County, MI, Barry County, MI, Bay County, MI, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Hillsdale 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, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Midland County, MI, Monroe County, MI, Montcalm County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI
The radar
The Detroit radar (KDTX), 80 km from the middle of the area, began a volume at 12:42 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 12:00Z, 0.7 hours before the alert went out and 83 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
- 1433 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 988 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.8
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 9:36 PM EDT | Mesoscale Discussion | SPC | Baraga, Dickinson, Gogebic, Houghton, Iron, Keweenaw and 2 more | 114 min |
| Jul 18, 10:44 PM EDT | Severe Thunderstorm Watch | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 6 more | 7 hr |
| Jul 19, 2:13 AM EDT | Mesoscale Discussion | SPC | Alger, Baraga, Delta, Dickinson, Iron, Marquette and 2 more | 92 min |
| Jul 19, 4:22 AM EDT | Mesoscale Discussion | SPC | Alpena, Antrim, Benzie, Charlevoix, Cheboygan, Clare and 15 more | 83 min |
| Jul 19, 11:12 AM EDT | Mesoscale Discussion | SPC | Berrien | 93 min |
| Jul 19, 11:32 AM EDT | Severe Thunderstorm Watch | SPC | Berrien, Branch, Cass, Hillsdale, Saint Joseph | 5 hr |
| Jul 19, 1:19 PM EDT | Mesoscale Discussion | SPC | Berrien, Branch, Cass, Saint Joseph | 86 min |
Nearby
Mesoscale Discussions in Michigan, 2020Every mesoscale discussion in 2020
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.