By Mary Kay Kleist

CHICAGO (CBS) — An upper-level system is just north of St. Louis and very slowly drifting northward. Rain will keep increasing from the south.

(Credit: CBS)

READ MORE: Kenosha County Sheriff's Deputy Shoots Chicago Homicide Suspect At Bristol Gas Station; Suspect Shot Police K-9 During Confrontation

According to CBS 2 meteorologist, due to the high moisture content, heavy downpours are possible. We also have the chance for a few skinny funnel clouds mainly south of I-80 until sunset.

(Credit: CBS)

This system will be overhead Friday, so the pattern stays the same. It does move away for the weekend as temperatures warm up.

Columbus Day is looking unsettled with scattered showers and isolated thunderstorms.

READ MORE: NOAA Releases 2021-2022 Winter Outlook

(Credit CBS)

TONIGHT: Scattered downpours, isolated thunderstorms and patchy fog. Low 63.

FRIDAY: Passing showers and isolated thunderstorms. High 71.

SATURDAY: Partly cloudy. High 79.

MORE NEWS: Chicago Weather: Sprinkles And Cooler Than Normal Temps Through The Weekend

SUNDAY: Partly cloudy. Breezy. High 83. Sprinkles after dark.

Mary Kay Kleist