BOISE, Idaho -

 Authorities say heavy snow and poor visibility are hampering the search for a small airplane that disappeared in the central Idaho backcountry.
    
The Valley County Sheriff Department launched the search Monday for a single-engine Beach Bonanza that went missing Sunday afternoon. Five people all from the same family were on board.
    
Lt. Dan Smith says more than 20 people are combing a mountain ridge near the Johnson Creek Airstrip, a backcountry landing strip near the tiny town of Yellow Pine. Smith says heavy snow has so far foiled efforts to search by air.
    
The plane was flying from Baker City, Ore., to Butte, Montana when it lost radio contact with controllers in Salt Lake City.
    
Authorities say the pilot reported engine troubles and asked for coordinates to the landing strip.