Sunday will be a very warm day. We should be well into a warm and increasingly humid air mass by then, leading to breezy conditions with highs reaching the middle 80s.
As a storm system develops to our west, scattered showers and thunderstorms will develop late in the day Sunday, continuing into Monday and Tuesday of next week. There may be some threat for strong to severe thunderstorms during that time period until the storm system passes by on Tuesday night. The best chance of severe weather at this time looks to be Monday afternoon. High temperatures will reach to the lower 80s for Monday and near 80 Tuesday.
Behind the storm it will be breezy and cooler on Wednesday with high temperatures in the lower 70s and scattered showers and isolated thunderstorms. There is still a chance of lingering showers Thursday with highs down to the mid 60s.
It is beginning to look like the weather for the Memorial Day weekend should be very nice with comfortable temperatures and lots of sunshine. High temperatures will climb from the upper 60s on Friday to the upper 70s on Memorial Day Monday. By Memorial Day, humidity levels will begin to creep up, and as a cold front approaches from the west, scattered showers and thunderstorms may develop.
SUNDAY: Partly sunny, breezy, warmer and more humid with increasing clouds and a chance of showers and thunderstorms late in the day. High: 84 Wind: SE 10-20 MPH
SUNDAY NIGHT: Mostly cloudy, warm and humid with scattered showers and thunderstorms. Low: 66 Wind: SE 8-15 MPH
MONDAY: Mostly cloudy, breezy, warm and humid with scattered showers and thunderstorms. High: 82 Wind: S 10-20 MPH
TUESDAY: Mostly cloudy and warm with scattered showers and thunderstorms. Low: 62 High: 78
WEDNESDAY: Mostly cloudy and cooler with scattered showers and isolated thunderstorms. Low: 58 High: 73
THURSDAY: Variably cloudy and cooler with a chance of showers. Low: 53 High: 65
FRIDAY: Mostly sunny and pleasant. Low: 48 High: 69
SATURDAY: Mostly sunny and pleasant. Low: 47 High: 72
SUNDAY: Partly sunny with showers developing late in the day. Low: 48 High: 72
MEMORIAL DAY (MONDAY): Variably cloudy, breezy, warm, and a little more humid with scattered showers and thunderstorms developing. Low: 58 High: 80
NOTES: The Storm Prediction Center says that there is a SLIGHT RISK for severe thunderstorms for Sunday and Sunday night for the southern half of Minnesota, all of Iowa, the northwestern third of Illinois, and southwestern Wisconsin (west of a line from the Twin Cities to Black River Falls to Beloit). A warm and increasingly humid air mass will move into the Midwest by late in the weekend. A developing storm system in the Plains and an approaching cold front will cause thunderstorms to develop in Iowa and Minnesota Sunday afternoon, moving into Wisconsin and Illinois Sunday night. Severe thunderstorms are possible with hail, high winds, heavy rainfall, and isolated tornadoes possible. The severe weather threat could linger through much of Sunday night.
There is a SLIGHT RISK of severe thunderstorms for Monday and Monday night for extreme southeastern Minnesota, the eastern half of Iowa,, most of Illinois, and the southern half of Wisconsin (south of a line from Rochester, MN, to Wausau to Marinette, MI). Hail, high winds, heavy rain, and isolated tornadoes are possible with the severe thunderstorms.