Alert archive / Iowa / Mesoscale Discussions in 2020
Mesoscale Discussion 1676
The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2020, 11:26 PM CDT for 34 counties in Iowa; 19 counties in Minnesota. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2020, 11:26 PM CDT (04:26 UTC)
- Expired
- Sep 6, 2020, 1:00 AM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 486
All 53 counties
Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clay County, IA, Delaware County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Johnson County, IA, Kossuth County, IA, Linn County, IA, Marshall County, IA, Mitchell County, IA, Osceola County, IA, Palo Alto County, IA, Poweshiek County, IA, Tama County, IA, Washington County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Lyon County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Redwood County, MN, Renville County, MN, Swift County, MN, Waseca County, MN, Watonwan County, MN, Yellow Medicine County, MN
The radar
The Minneapolis radar (KMPX), 178 km from the middle of the area, began a volume at 04:27 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
Minneapolis, MN (KMPX), launched 00:00Z, 4.4 hours before the alert went out and 178 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
- 2083 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Sep 5, 7:53 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 19 more | 2 hr |
| Sep 5, 9:34 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 47 more | 7 hr |
| Sep 6, 1:06 AM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 28 more | 84 min |
| Sep 6, 2:32 AM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 45 more | 88 min |
| Sep 6, 2:53 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 33 more | 6 hr |
| Sep 6, 5:30 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 31 more | 90 min |
Nearby
Mesoscale Discussions in Iowa, 2020Mesoscale Discussions in Minnesota, 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.