4:50 AM EST Saturday 19 November 2016
Snow squall watch in effect for:
- Barrie – Collingwood – Hillsdale
Snow squalls are expected to develop. Under the snow squall bands, visibilities will be significantly reduced due to the heavy snow combined with blowing snow, and snow will quickly accumulate.
Lake effect snow likely beginning tonight and continuing Sunday..
After the record setting warm spell of the past couple of days, a significant change in the weather is expected as much colder arctic air blasts in over the mild waters of the Great Lakes tonight and Sunday. As a result, conditions will quickly become favourable for snow squalls to develop tonight and continue through Sunday.
Local snowfall amounts in the heaviest snow squalls of 10 to 20 cm are expected overnight and Sunday. In addition, strong and gusty northwest winds will whip up freshly fallen snow, resulting in sudden very low to at times nil visibility in blowing snow.
Driving conditions will quickly deteriorate tonight after the flurries and snow squalls arrive. Motorists should consider adjusting their travel plans accordingly.
Latest indications suggest that snow squalls will continue through Sunday night before slowly weakening to flurries on Monday.
Snow squalls cause weather conditions to vary considerably; changes from clear skies to heavy snow within just a few kilometres are common. Visibility may be significantly and suddenly reduced to near zero. Surfaces such as highways, roads, walkways and parking lots may become difficult to navigate due to accumulating snow.
Snow squall watches are issued when conditions are favourable for the formation of bands of snow that could produce intense accumulating snow or near zero visibilities.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to firstname.lastname@example.org or tweet reports to #ONStorm.