Weather in Minnesota can swing from one end of the pendulum to the other in short order this time of year, and that's precisely what's happening now as the warm and humid conditions of Sunday have gone and been replaced by a taste of fall for the southern two-thirds of the state, and even some winter flavor for the northern third of Minnesota.
The National Weather Service (NWS) has issued a freeze warning for Roseau, East Marshall, Pennington, Red Lake, East Polk, North Clearwater, South Clearwater and Mahnomen counties in northwestern Minnesota. Temps there are expected to dip to below 32 degrees between 3-9 a.m. Tuesday.
A freeze watch has been issued for surrounding areas, including as far south as Detroit Lakes and Fergus Falls. Temps below freezing can kill crops and other sensitive vegetation.
Meanwhile, most of the rest of the northern third of Minnesota is under a frost advisory for overnight into Tuesday morning, with temps expected to drop into the 30s.
Coldest morning comes Wednesday
The coldest morning of the week for all of Minnesota is forecast to be Wednesday, where temps in the majority of the state will be cold enough to produce frost. The Twin Cities metro area and areas to the south and east are expected to remain closer to 40, according to the Twin Cities office of the NWS.
The Fargo-Moorhead area could see one of its earliest freezes on record Wednesday morning. If the temp there drops to 32 or lower, it'll tie Sept. 9, 1910 for the seventh-earliest freeze in the neighboring cities. Five of the six earliest freezes in Fargo-Moorhead all happened in the 1800s.
The high temp Tuesday in the Twin Cities just 50 degrees. The weather service notes that rain will move into Minnesota, including the Twin Cities, Monday afternoon. Where rain remains falling Tuesday will likely see high temps only in the 40s, with highs Tuesday in the 50s where rain isn't falling.
Bottom line: it looks pretty dreary through Wednesday. Here's the radar simulation from the NAM Nest computer model.