Alert archive / Michigan / Mesoscale Discussions in 2020
Mesoscale Discussion 1271
The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2020, 4:22 AM EDT for 21 counties in Michigan. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2020, 4:22 AM EDT (08:22 UTC)
- Expired
- Jul 19, 2020, 5:45 AM EDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 40%
All 21 counties
Alpena County, MI, Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Cheboygan County, MI, Clare County, MI, Crawford County, MI, Emmet County, MI, Grand Traverse County, MI, Kalkaska County, MI, Leelanau County, MI, Manistee County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Wexford County, MI
The radar
The NCL Michigan radar (KAPX), 36 km from the middle of the area, began a volume at 08:25 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, 8.4 hours before the alert went out and 219 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
- 1438 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1158 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 329 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.5
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, 8:42 AM EDT | Mesoscale Discussion | SPC | Arenac, Barry, Bay, Branch, Calhoun, Clinton and 27 more | 2 hr |
| 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.