For Fort St. John and the North Peace, we could see up to 4 cm of snow by Sunday morning with the snow ending Sunday.  

Below is the full warning from Environment Canada.

B.C. South Peace River
10:45 PM PDT Saturday 27 October 2012
Snowfall warning for
B.C. South Peace River issued

10 cm of snow expected tonight.

This is a warning that significant snowfall is expected or occurring in these regions. Monitor weather conditions..listen for updated statements.

A Pacific frontal system will move across Central British Columbia tonight. The front is giving moderate to heavy snow to the above regions. 10 cm of snowfall accumulations are expected by Sunday morning when the front moves to the north.