Alert archive / Minnesota / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 489
The Storm Prediction Center issued this severe thunderstorm watch at Sep 20, 2017, 1:22 AM CDT for 14 counties in Minnesota; 5 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 20, 2017, 1:22 AM CDT (06:22 UTC)
- Expired
- Sep 20, 2017, 5:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Aitkin County, MN, Anoka County, MN, Carlton County, MN, Carver County, MN, Chisago County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Pine County, MN, Ramsey County, MN, Sherburne County, MN, Washington County, MN, Wright County, MN, Burnett County, WI, Douglas County, WI, Polk County, WI, Saint Croix County, WI, Washburn County, WI
The radar
The Duluth radar (KDLH), 87 km from the middle of the area, began a volume at 06:24 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 1:37 AM CDT | Severe Thunderstorm Warning | MPX | Meeker, Sherburne, Stearns, Wright | 38 min |
| Sep 20, 1:49 AM CDT | Severe Thunderstorm Warning | MPX | Benton, Kanabec, Mille Lacs, Morrison | 56 min |
| Sep 20, 2:00 AM CDT | Severe Thunderstorm Warning | DLH | Aitkin, Carlton, Pine | 30 min |
| Sep 20, 2:00 AM CDT | Severe Thunderstorm Warning | MPX | Benton, Isanti, Mille Lacs, Sherburne | 45 min |
| Sep 20, 2:29 AM CDT | Severe Thunderstorm Warning | DLH | Aitkin, Carlton, Pine | 46 min |
| Sep 20, 3:04 AM CDT | Severe Thunderstorm Warning | MPX | Chisago | 26 min |
| Sep 20, 3:10 AM CDT | Severe Thunderstorm Warning | DLH | Carlton, Saint Louis | 35 min |
| Sep 20, 3:15 AM CDT | Severe Thunderstorm Warning | DLH | Burnett, Washburn | 45 min |
| Sep 20, 3:16 AM CDT | Severe Thunderstorm Warning | DLH | Carlton, Pine | 44 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 8:56 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Clay, Clearwater, Grant, Kittson and 12 more | 2 hr |
| Sep 19, 10:10 PM CDT | Mesoscale Discussion | SPC | Benton, Blue Earth, Brown, Carver, Cass, Chippewa and 37 more | 35 min |
| Sep 19, 10:36 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Beltrami, Benton, Brown, Cass, Chippewa and 30 more | 4 hr |
| Sep 20, 1:03 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Hennepin and 18 more | 87 min |
| Sep 20, 3:17 PM CDT | Mesoscale Discussion | SPC | Adams, Columbia, Crawford, Dane, Grant, Green Lake and 11 more | 118 min |
Nearby
Severe Thunderstorm Watches in Minnesota, 2017Severe Thunderstorm Watches in Wisconsin, 2017Every severe thunderstorm watch in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.