Alert archive / Iowa / Tornado Watches in 2022
Tornado Watch 117
The Storm Prediction Center issued this tornado watch at Apr 12, 2022, 7:54 PM CDT for 5 counties in Iowa; 4 counties in Minnesota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2022, 7:54 PM CDT (00:54 UTC)
- Expired
- Apr 13, 2022, 12:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Chickasaw County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Mower County, MN, Olmsted County, MN
The radar
The La Crosse radar (KARX), 90 km from the middle of the area, began a volume at 00:58 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 60%
- One or more EF2 to EF5 tornadoes
- 50%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 8:30 PM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 60 min |
| Apr 12, 8:46 PM CDT | Tornado Warning | ARX | Floyd | 44 min |
| Apr 12, 9:08 PM CDT | Tornado Warning | ARX | Mitchell | 37 min |
| Apr 12, 9:26 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Mitchell | 49 min |
| Apr 12, 9:56 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Mitchell | 49 min |
| Apr 12, 10:18 PM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 42 min |
| Apr 12, 10:26 PM CDT | Flash Flood Warning | ARX | Mitchell | 3 hr |
| Apr 12, 10:30 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Floyd, Howard, Mitchell | 60 min |
| Apr 12, 10:37 PM CDT | Tornado Warning | ARX | Howard, Mitchell | 23 min |
| Apr 12, 11:02 PM CDT | Tornado Warning | ARX | Fillmore, Mower | 28 min |
| Apr 12, 11:07 PM CDT | Tornado Warning | ARX | Howard, Mitchell | 23 min |
| Apr 12, 11:15 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Fayette, Howard, Winneshiek | 45 min |
| Apr 12, 11:19 PM CDT | Severe Thunderstorm Warning | ARX | Fillmore, Houston, Olmsted, Winona | 41 min |
| Apr 12, 11:23 PM CDT | Tornado Warning | ARX | Fillmore, Olmsted, Winona | 37 min |
| Apr 12, 11:27 PM CDT | Tornado Warning | ARX | Howard, Winneshiek | 17 min |
| Apr 12, 11:43 PM CDT | Severe Thunderstorm Warning | ARX | Fillmore, Houston, Winona | 47 min |
| Apr 12, 11:51 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 39 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.9 hours before the alert went out and 181 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
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 7:14 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 14 more | 2 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
Tornado Watches in Iowa, 2022Tornado Watches in Minnesota, 2022Every tornado watch 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.