A slow moving and complex low pressure system will affect the Northland starting on Sunday and lasting until at least Tuesday.
Low pressure over Illinois early this evening will lift slowly north through Monday, while low pressure moves southeast out of the Northern Rockies. These two lows will phase somewhat over the upper Midwest while they also sit and spin over the region for a few days. The end result from all this will be for another multiday light to moderate rainfall event for northeast Minnesota and northwest Wisconsin, and as colder air works into some parts of the area will likely see the rain mix with and possibly even change over to wet snow at times Monday and Tuesday.
Precipitation totals of a half inch to an inch are possible in much of northeast Minnesota and far northwest Wisconsin from Sunday through Tuesday, while around a quarter inch of precipitation is possible across southwest portions of the area.
Some mid-April snow is looking increasingly likely for parts of north-central and east-central Minnesota in the Monday-Tuesday time frame, with some minor snow accumulations possible. Note: Looks like the precipitation will remain in the form of rain in Duluth and Superior Monday and Tuesday, with chances for snow or a rain/snow mix greatest farther west/southwest of the Twin Ports the way it looks now.
Here’s the 18z NAM 3km model simulated radar forecast valid from 1 AM Tonight to 1 AM Tuesday.
- Some light rain is forecast to move into northwest Wisconsin late tonight (after Midnight)
- Rain builds farther west/northwest during the day Sunday, with rain chances increasing in Duluth and Superior especially after 12 PM Sunday.
- Rain continues at times Sunday night through Monday night, and some of the rain will likely mix with or change over to wet snow at times on Monday, especially across parts of north-central Minnesota, mainly west of Duluth and Superior the way it looks now.
Widespread 1 to 2 inches+ of rain fell across the Northland between April 6 and April 9, 2021.
Rainfall totals from April 6 to April 9, 2021 were well above average, by some 400-750% of normal.
Duluth: Total 1.14″; normal 0.28″. 407% of normal
International Falls: Total 2.15″; normal 0.18″. 1,194% of normal.