Alaska State Troopers say bad weather has prevented rescuers from reaching the helicopter on Mount Mageik (ma-GEEK').
Troopers say everyone on board the Elgi Air Haul helicopter is in good condition.
There are no reported injuries or damage to the chopper, which is sitting at the 6,500-foot level of the mountain in Katmai National Park and Preserve.
The park's chief ranger, Neal Labrie, says a nature webcam in the area is helping to gauge the cloud cover on the mountain.
The researchers with the U.S. Geological Survey and the University of Alaska-Fairbanks were working on volcano-monitoring equipment before they were caught in the freezing rainstorm Wednesday evening.
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