12/17/2013 04:56 EST | Updated 02/16/2014 05:59 EST

Flash freeze warning issued in B.C., Alberta Peace Region

A flash freeze warning has been issued for B.C.'s South Peace River region and the area around Grande Prairie, Beaverlodge and Valleyview in Alberta.

Environment Canada said Tuesday that a "vigorous cold front" was moving into the region, and warned that above-zero temperatures would plummet suddenly in the afternoon or early evening.

Earlier Tuesday morning, the temperature in Fort St. John, B.C., dropped 14 C in one hour.

In the Grande Prairie region, new snowfall that melted with the day's warmer temperature is expected to suddenly refreeze by the early evening.

Environment Canada says a flash freeze warning is issued with the passage of a front when above-zero temperatures are predicted to drop below 0 C at a rate at or above 12 C in three hours.