Alberta backcountry enthusiasts are being warned about an avalanche danger this weekend.

The risk in Kananaskis and the south Rockies is rated as considerable to high, while some parts of B.C., including the north and south columbia regions, are rated as extreme.

The Canadian Avalanche Centre is blaming the “Pineapple Express,” a weather system that originates near the Hawaiian Islands, for creating unstable conditions by raising temperatures and dumping rain on recent heavy snow.

The centre says natural and human-triggered avalanches are sure to occur in southern and southeastern B.C.