Environment Canada is issuing a winter weather travel advisory for a large portion of the Ottawa Valley, including Arnprior, Renfrew, Pembroke, Petawawa, Cobden, Calabogie, Barry's Bay and Killaloe.
It expects periods of rain or drizzle to change to snow overnight as cold air floods into the region early Friday, November 26, and temperatures begin to fall.
About 5 cm of snow is expected to fall by the time it tapers off late Friday afternoon, or in the evening.
The weather agency says falling temperatures and snowfall will lead to hazardous road conditions.
For road conditions and other traveller information from the Ministry of Transportation, click here, or call 5-1-1.