By Tuesday afternoon, total snowfall accumulations will vary across the state. "Joseph Counties are under a Winter Storm Warning for 5-9" of snow with some easily seeing 8-12".
Environment Canada has issued a winter weather travel advisory for Waterloo Region and Wellington County.
As much as six inches of snow are possible overnight, followed by temperatures possibly falling to record lows during the day and into the evening, dipping 20 to 25 degrees from Sunday's relatively mild temperatures.
A coating is expected through the morning but the heavy snowfall will be in the afternoon through Monday night.
More snow could fall in areas of Pennsylvania early into the new week. The lake-effect snow could continue into Wednesday. It'll be even colder Tuesday and Wednesday with highs in the 20s and lows in the single digits and teens. Highs will be around 30 in Cleveland and Akron.
A slight moderation in temperatures will occur by late in the week as highs get back to and above the freezing mark by Thursday. The lake-effect snow will taper off Tuesday evening. A wintry mix of rain and snow showers develops tonight and will remain scattered throughout the morning.