Here’s how you can tell there’s a big change coming to the weather: While temperatures in Waterloo Region sat at 16 C, areas to the north found themselves under a snow squall watch.

Environment Canada issued the watch Tuesday afternoon for Bruce County, northern Grey County and other areas around Georgian Bay, including the Midland and Parry Sound regions.

At the time, even remote Wiarton was experiencing ununusually warm November temperatures, with the Wiarton Airport measuring 12 C.

It’s all because of a cold front moving in from the Prairies that will see double-digit drops in temperatures from Tuesday afternoon to Monday morning across southern Ontario.

Cold air and strong winds are expected to produce snow squalls over the bay beginning Wednesday morning and lasting into Thursday.

In the heaviest-hit areas, between 10 and 15 cm of snowfall is possible.

Temperature-wise, overnight lows of 2 C are expected in Waterloo Region, southern Wellington County, northern Grey County and all of Bruce County, with Huron-Perth, northern Wellington, southern Grey and Oxford-Brant sitting at 1 C.

Precipitation will begin early Tuesday evening, with most areas in line for a chance of rain or flurries through the overnight hours.

Wednesday, snow will hit Bruce-Grey and Huron-Perth, with the risk falling further to the south.

Temperatures will hold steady just above the freezing mark, with most areas dipping below freezing Wednesday night.

Looking further ahead, Thursday and Friday appear set to feature daytime highs just above freezing, overnight lows just below freezing and a continuing chance of flurries throughout our coverage area.