(Snowfall totals map below)
Snowfall has already begun in western Manitoba and that snowfall will continue to intensify and move eastward throughout the day. Here in southeastern Manitoba, the sunshine will actually be making its appearance this morning ahead of the Montana Low. Cloudy skies will replace the sunshine this afternoon, and this will bring the chance for some flurries. Winds will be brisk out of the southeast near 30 km/h and gusting up to 50 km/h. This will create drifting snow on highways therefore it may be necessary to slow down at times if you have to travel.
The main snowfall moves in by around supper and continues throughout the night. Winds will diminish this evening and become nearly calm overnight as the centre of the low moves close to southeastern Manitoba. However, by tomorrow morning we will be entering the colder and windier side of the system with winds dramatically increasing early or mid morning. They will become northerly or northwesterly between 40 and 50 km/h and gusting up to 60 km/h for Winnipeg. At this point it appears the strongest winds will be in the Red River Valley, generally south of Winnipeg where gusts to 70 km/h are possible. This will create blizzard conditions in open areas and on highways. It's because of this that Environment Canada has issued winter storm watches for south-central and southeast Manitoba. Blizzard warnings may be issued in the Red River Valley if things set up as expected.
As for snowfall totals, it appears western Manitoba will bear the brunt of the snowfall. 20-30 cm is expected for Riding Mountain National Park, Dauphin and Roblin areas. 15-20 cm is expected in the Interlake and a general 10-15 cm everywhere else. However, locally higher amounts are possible. Around 10 cm is expected in Winnipeg.
I have made a map of the snowfall totals that I am expecting for southern Manitoba from this morning up to Monday night:
I don't usually make my own snowfall total maps, but I thought I'd give it a try this time.