Minnesota Braces for Gale-Force Waves, Chilly Temperatures and Late-Season Rain

A gale warning has been issued for Lake Superior, with NOAA projecting wave heights that could briefly exceed 11 feet as winds shift eastward off the North Shore. The warning applies Tuesday evening, primarily affecting the western side of Michigan’s Upper Peninsula and the Duluth harbor area.

Minnesota Public Radio (MPR)

Temperatures will plunge Wednesday morning across northern Minnesota, with highs in the upper-30s °F and lows in the low-40s °F. The Minneapolis-St. Paul International Airport is forecast to record its coldest morning since May 24. Southern portions should stay in the lower-50s °F. A modest wind-chill may make conditions feel colder, especially in the north.

Minnesota Public Radio (MPR)

Wednesday afternoon will stay below normal but remain dry until evening, when rain moves into the western part of the state. Additional precipitation is likely after midnight, extending into early Thursday, with another band late Thursday night into early Friday.

Minnesota Public Radio (MPR)

September in Minnesota usually brings cool mornings, mild afternoons and the first hints of autumn foliage, especially in northern regions such as Roseau and the Iron Range. An ongoing drought has reduced soil moisture and may delay leaf-color development. Early leaf color is driven by day length and cooler temperatures, both present this week.

Minnesota Public Radio (MPR)

• Wave forecast: Up to 11 feet on Lake Superior (NOAA).

Minnesota Public Radio (MPR)

• Temperature range: Upper 30s °F to low 40s °F in the north; lower 50s °F in the south (NOAA via WeatherBell).

Minnesota Public Radio (MPR)

• Rainfall projections: Models show 2–3 inches of rain from Highway 212 southward to Highway 14, with the Twin Cities potentially receiving just over 2 inches.

Minnesota Public Radio (MPR)

• Soil moisture: Near the Twin Cities, top-two-inch moisture is 4–12 % of normal (NOAA via WeatherBell).

Minnesota Public Radio (MPR)

NOAA’s gale warning stresses the risk of large, short-duration waves for vessels on Lake Superior, urging mariners to exercise caution. WeatherBell notes the “dry until dinner-time” pattern on Wednesday, followed by rainfall that could benefit drought-stricken soils, with nighttime rain less likely to evaporate.

Minnesota Public Radio (MPR)

The rain events are expected to modestly improve soil moisture, which has been unusually low. Increased moisture may support the chemical changes in leaves that trigger color development, potentially advancing early foliage along Highway 61 and other northern corridors. The drought’s overall effect on the season’s color progression remains uncertain.

Minnesota Public Radio (MPR)

• Tuesday evening: Gale warning active; wave heights up to 11 feet.

Minnesota Public Radio (MPR)

• Wednesday morning: Coldest temperatures of the season; wind chill possible.

Minnesota Public Radio (MPR)

• Wednesday afternoon: Mostly dry, pleasant conditions.

Minnesota Public Radio (MPR)

• Wednesday night to early Thursday: Rain develops across western Minnesota.

Minnesota Public Radio (MPR)

• Late Thursday night to early Friday: Additional rain, with some areas receiving up to 2–3 inches.

Minnesota Public Radio (MPR)