The Winter Storm Watch has been upgraded to a Winter Storm Warning.

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Environment Canada has upgraded their Special Weather Statement in the region to a Winter Storm Watch.

A developing low-pressure system is expected to bring heavy snow to parts of northwestern Ontario. Snow is expected to begin Wednesday night and continue through Friday, before tapering to light snow or flurries on Saturday.

The snow will be accompanied by strong winds at times which could result in reduced visibilities due to blowing snow especially on Thursday and possibly Friday.

Total accumulations of 25 to 40 cm are possible by Friday evening however regions in the swath of heaviest snow could see local amounts of up to 50 cm.

Travel is expected to rapidly deteriorate Wednesday evening.

Rapidly accumulating snow could make travel difficult over some locations. Visibility may be suddenly reduced at times in heavy snow. Surfaces such as highways, roads, walkways and parking lots may become icy and slippery.

Public Safety Canada encourages everyone to make an emergency plan and get an emergency kit with drinking water, food, medicine, a first-aid kit and a flashlight.