Showery, mild weather Friday morning and afternoon gives way to falling temperatures in the afternoon as the coldest temperatures thus far in the season arrive in the Chicago area. Skies clear at night and readings plunge into the 30s. Northwest of Chicago, over the Dakotas, snow is falling in association with a powerful low pressure system centered over northern Minnesota. The low will be slow to move away and it will be located just north of Lake Superior on Sunday. This means a long period of snow can be expected across the Dakotas today, with rain over Minnesota. Rain changes to snow across Minnesota by Saturday and continues in the Dakotas, then gradually diminishes to light snow Sunday across Minnesota and northern Wisconsin. Snow totals of 30 or more inches are likely in northeast North Dakota.