McCall, Idaho – Anyone traveling along ID-55 north of Boise toward McCall should avoid backcountry terrain immediately as avalanche danger has reached High above 6,500 feet Tuesday, with slides capable of reaching valley floors near roadways.
According to the Payette Avalanche Center, an Avalanche Warning remains in effect for the West Central Mountains and Salmon River Mountains through late Wednesday morning. Heavy, wet snowfall combined with valley rain and strong winds is creating widespread instability. Above 7,500 feet, danger is rated Level 4 out of 5, or High, meaning natural avalanches are likely and human-triggered slides are very likely. Between 6,500 and 7,500 feet, conditions remain High, while elevations below 6,500 feet are rated Considerable.
Forecasters report 2 to 4 feet of storm snow forming slabs over weaker layers. Wind slabs and loose wet avalanches are expected as temperatures rise this afternoon. Some avalanches may run long distances and impact trails or roadways beneath steep terrain, including stretches of ID-55 between Cascade and McCall and backcountry routes off ID-21 near Lowman.
Travel in avalanche terrain is not recommended. Backcountry recreationists should avoid steep slopes, especially those facing wind-loaded aspects. Snowmobilers and skiers should stick to low-angle terrain well away from avalanche paths. Motorists should remain alert for debris near canyon corridors.
The most unstable conditions are expected to persist through Tuesday night as additional precipitation and gusty ridge winds continue. Warnings remain in effect through Wednesday morning, and further updates are likely if heavy snowfall continues.
