Our forecasting team is tracking an overachieving Clipper system tracking through the Lower Great Lakes Overnight. Dissipating West to East through Sunday AM.
A quick burst of snow begins near midnight tonight, persisting through the pre-dawn hours (5-6am) Sunday morning. Generally, 3-8cm is expected. Due to the nature of clipper systems amounts will vary throughout the forecast area.
Wind gusts to 60-70km/h are expected along the north shore of Lake Erie (along the Niagara Peninsula), early Sunday morning. Watch for local blowing snow and poor travel in the area.
Exercise caution if you are travelling early Sunday morning. Since it is a weekend, little impact to transportation is anticipated.
Alberta Clippers are synonymous for bringing snowfall lee of the Canadian Rockies, during December and January. These typically moisture-starved systems are fast movers, ejecting quickly out of Alberta, through the Southern Prairies – towards the Great Lakes. Read more about Alberta Clippers here.
A clipper is expected to form
in Northern Alberta Saturday evening. Normally, these systems are more of a
nuisance, accompanied by low snowfall totals and quick forward motion. On the
contrary, this weekends system will flourish. Thanks to clashing temperatures
and abundant Pacific moisture.
Accumulations will vary greatly throughout the Prairies, bearing in mind the heaviest snow will fall along a narrow swath. Current guidance suggests close to 15cm across the northern extent of the darker shaded region (in our forecast map). Including, Northern & Central Alberta. The heaviest snow (~20cm) will fall across Extreme Southwest Manitoba and Southeast Saskatchewan. *Model guidance has increased snowfall totals further into Southwestern Manitoba, where Environment Canada has issued snowfall warnings. Several warnings now stretch across parts of Prairies.
There will be another swath of snow tracking down the Rockies, bringing 10-20cm. It looks like Calgary will be limited to less than 5cm through Friday. By Saturday, a steep contrast in temperature envelopes the Prairies. Calgary will see a high of 9c and sunshine. Whereas, Eastern Saskatchewan will still be below freezing.
STRONG WINDS & BLOWING SNOW
Winds pickup between the
Grande Prairie – Whitecourt corridor early Saturday evening. Winds sustained at
or over 30km/h, gusting 60-80km/h. Gusty winds will overspread much of Alberta and
Southern Saskatchewan overnight Saturday into Sunday morning. The strongest
wind gusts aren’t expected to coincide with the heaviest swath of snow. Still,
freshly fallen snowfall, which is dry and light – will combine with gusty winds.
Bringing local blowing and drifting snow. Stay tuned to weather advisories, or
statements pertaining to any potential road closures.