The latest data is suggesting that we could find ourselves with ideal snowsquall creating conditions for the end of this week.
Cold air will rush in behind a storm system that moves to our east on Thursday. Upper level temperatures (850mb or ~5,000 feet) will drop to below -10C. When this cold air rushes over the relatively warm waters of Superior and Huron we will find ourselves in an unstable situation that will allow for snow squalls to form. These squalls could be severe and bring 5-10cm per hour, for locations within the strongest bands.
The only riddle to solve is which direction the winds will blow?
Weak squalls should start Thursday night and be blowing from the NW. These squalls will bring some snow to the Sault region but will move overnight. By Friday morning the winds will become westerly and regions north of the Sault should see some heavy snow squall activity. Then by late Friday into Saturday we will see some southwest winds which will threaten St. Joseph Island, the North Channel and regions well north into Wawa.
Here’s a few maps to illustrate potential squall locations. Be advised that changes in wind direction forecasts could move squalls around between now and then….
