Day 2 - 3 Outlook

Valid: Monday, November 11, 2019 - 12AM to Wednesday, November 13, 2019 - 12AM

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Forecast Discussion

Issued: Sunday, November 10, 2019 - 12:40AM

Forecaster: Brennen Perry

A significant dumping of snow still looks likely on Monday and into early Tuesday throughout the GTHA, Southwestern and Eastern Ontario. The first bands of light to moderate snowfall will begin to affect areas around Lake Erie on Monday morning with the snow becoming more intense after the noon hour. Throughout the afternoon we will see the precipitation expand to the north encompassing much of the region south of Lake Simcoe with heavy snow arriving just in time for the evening commute. Some indications suggest that lake enhancement is possible in a zone south of Lake Huron between Sarnia and Grand Bend along with the Niagara/Hamilton region. Generally, snowfall accumulation will range from 10-15cm with some potential local pockets slightly over 15cm. The areas that get into lake enhancement can expect between 15-30cm though accumulation will vary substantially within the small region due to the very localized nature of lake effect snow hence the large range. Moving out to Eastern Ontario, snow will start after the dinner hour with the heaviest snow contained to a corridor extending along the Lake Ontario shoreline to parallel to the US border and persist well past the midnight hour. The closest you get the to US border, the more snow you can expect to see with a swath of 15-25cm right along the border including the Brockville and Cornwall area. Potential snowfall accumulation will drop off as you go the north and west with Ottawa seeing between 5-10cm. The snow will slowly come to an end on Tuesday from west to east beginning early Tuesday morning and around the noon hour for far Eastern Ontario.


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