The weather service is predicting a severe thunderstorm threat and the possibility of wintry weather into Monday, with a high of 66 degrees predicted. The primary threat of severe weather is from damaging winds near and east of Interstate 55. After storms, rain may change over to snowfall into the night, leading to significant accumulations of snow and potentially disruptive travel disruptions. The weather service also noted that Monday and Tuesday will be colder than the current forecast.