A fast moving Alberta Clipper will move out of Manitoba Tuesday morning and into the Kenora region before noon. The leading edge of snow then moves into the Thunder Bay region by nightfall and into the Sault Ste. Marie to Sudbury corridor on Wednesday morning.
Manitoba already has snowfall warnings in place for 10-20cm of snow early Tuesday to the west of Red Lake and Kenora. Snow will then transition into Ontario. Water equivalent amounts from Forecast Guidance suggests 5-10mm of precipitation but the cold temperatures will lead to a high snow to water ratios near 20:1. As a result, 10-20cm is likely with gusty winds bringing blowing snow.
The NAM3km Guidance shows a swath of snow of 10-15cm from the Manitoba border to the Quebec border for Tuesday into Wednesday.
Once the Clipper moves out of Northern Ontario then much colder air floods into the Province. This will mark the way for an extended cold snap that will last well into next week.