The wind chill in Edmonton last weekend reached down to -50 C. Such freezing cold temperature and wind chill values led to Environment Canada issuing a Wind Chill Warning to much of Alberta and the prairie provinces. The deep freeze is expected to continue until Thursday, when the next wave of low pressure arrives from British Columbia (the current system that dumped about 10 cm of snow in Vancouver, BC)

Southern Ontario - Anyways, back to the main topic of this post. The aforementioned cold air will descent into much of Ontario, following the system that is dumping misery rain in southern Ontario. Once the system pulls out, the Arctic air floodgates open, and with it, a strong (though not as strong as last week, at about 30 - 35 kph) north-northwest winds will accompany with it. The snowsquall activity should begin Tuesday evening, and continuing through Thursday morning. 

As a Great Laker, one should know that this brings on the snowsqualls. Since this time, the wind direction is angled at north-northwest, bands of snowsqualls may actually reach as far south as the Greater Toronto Area. The north-eastern portion and the north-western portion of the GTA is expected to have more accumulation than in the downtown core. 

With this snowsquall activity, the snowsquall amount will vary, as depicted in my following map. However, rule of thumb, areas in the south-eastern shores of Georgian Bay and Lake Huron may experience as much as 30 cm of snow, locally reaching 40 cm.

Anyhow, the following map (that I spent 2 hours making), summarizes all (of how I view this system):

The brown arrows indicate the general wind directions.

Sorry.. I forgot to make the legend, but here you go:

There are four shades of blue:

The lightest shade: 2 - 5 cm accumulated snow

The second lightest shade (sky blue colour): 5 - 10 cm

The third lightest (blue-purple): 10 - 20 cm

The darkest (Navy blue): 20 + cm 

Here's my forecast. Since I'm running out of time, I'll just forecast for the major cities below:

Sarnia - 5 - 8 cm

Chatham - Trace to 2 cm

London - 4 - 8 cm (My map and my forecast may be slightly underestimated)

St. Thomas - Trace to 4 cm (again, may be underestimated)

St. Mary's - 2 - 4 cm

Stratford - Trace to 4 cm (may be underestimated on the map)

Goderich - 10 to 15 cm

Kincardine - 25 to 30 cm

Owen Sound - 15 to 20 cm

Tobermory - 10 to 18 cm

Meaford - 18 to 22 cm

Collingwood - 22 to 30 cm

Wasaga Beach - 25 to 30+ cm

Midland - 18 to 22 cm (may be slightly overestimated on the map)

Orillia - 8 to 15 cm

Gravenhurst; Bracebridge - Trace to 3 cm

Barrie - 15 to 20 cm

Keswick / Bradford / Georgina / Sutton - 8 to 15 cm

Northern York Region (Newmarket ; Aurora) - 5 to 10 cm

Markham / Pickering / Ajax / Whitby - 2 to 7 cm

Richmond Hill / Vaughan - Trace to 5 cm

Peel Region - None (Mississauga) to 5 cm (Caledon)

North Toronto (North of the 401) - Trace to 4 cm

South Toronto (Downtown) - None to 2 cm

Waterloo Region (Kitchener / Waterloo) - 3 to 5 cm (may be slightly underestimated on the map)

Cambridge - Trace to 4 cm

Kawartha Lakes / Beaverton - 4 to 8 cm

Grimsby / Lincoln / Welland - Trace to 4 cm

St. Catharines / Niagara Falls - 3 cm to 8 cm

Niagara - on - the - Lake - 6 cm to 12 cm

Fort Erie - Trace to 3 cm 

* Bolded cities indicate the cities that I think would be the hardest hit.

If you have any comments about this forecast, please post it. Thanks!