Alert archive / Iowa / Mesoscale Discussions in 2022
Mesoscale Discussion 464
The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2022, 7:14 PM CDT for 20 counties in Iowa; 6 counties in Minnesota; 11 counties in Wisconsin. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2022, 7:14 PM CDT (00:14 UTC)
- Expired
- Apr 12, 2022, 9:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch likely
- Chance of a watch
- 80%
All 37 counties
Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Howard County, IA, Marshall County, IA, Mitchell County, IA, Tama County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Crawford County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 121 km from the middle of the area, began a volume at 00:14 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, 0.2 hours before the alert went out and 204 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
- 992 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 710 m²/s²
- 0-3 km storm-relative helicity
- 827 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 |
|---|---|---|---|---|
| Apr 12, 7:54 PM CDT | Tornado Watch | SPC | Chickasaw, Floyd, Howard, Mitchell, Winneshiek | 4 hr |
| Apr 12, 9:38 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Benton, Black Hawk, Boone and 31 more | 2 hr |
| Apr 12, 10:26 PM CDT | Mesoscale Discussion | SPC | Allamakee, Winneshiek | 64 min |
| Apr 12, 10:45 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Fayette | 3 hr |
Nearby
Mesoscale Discussions in Iowa, 2022Mesoscale Discussions in Wisconsin, 2022Mesoscale Discussions in Minnesota, 2022Every mesoscale discussion in 2022
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.