We've been experiencing some very spring like temperatures and sunshine this week, but that's all about to come to a halt.
A low is tracking up from Texas that is moving into Ontario on Wednesday and continuing into Thursday.
A winter storm warning is in effect for virtually all of Southern Ontario -- including Dufferin County, Wellington County, Grey-Bruce, Huron-Perth, Caledon, Brampton, New Tecumseth, Innisfil, Angus, Collingwood and Orillia.
Environment Canada says snow will be heavy at times, and we could see up to 30 centimetres depending on where you are.
Meteorologist Rob Kuhn says it even could be more depending on where you are, especially on the shores of Georgian Bay or Lake Huron when you get the lake effect snow.
Driving conditions are expected to deteriorate quickly, shortly after the snow arrives on Wednesday.
Kuhn says if you absolutely must travel, considering adjusting your plans to suit the changing weather conditions so it will be a little safer for you to head out.
The wind will be strong too, and that's expected to cause blowing and drifting.
Safety experts encourage everyone to get an emergency kit with drinking water, food, a first aid kit and a flashlight.