Video © Christine Tartaglia Visitors captured a rare rock avalanche from the north face of Cheops Mountain in Glacier National Park on June 25th. Rock releases like this are more likely to occur in the spring and fall when temperature swings result in the repeated freezing and thawing of water captured in cracks in the rock. This widens the cracks and eventually leads to releases. Summer or winter, it's always a good idea to be aware of overhead hazards. Avoid spending time in avalanche paths or

Rock avalanche rolls toward hikers: panic breaks out