Yellowstone National Park, WY – Yellowstone and Grand Teton National Park officials have opened a 30-day comment period on temporary rules for snowmobiling this coming winter in both parks. Park service officials say the comments will be used to come up with several management options. Those alternatives will then be opened for a 30-day public review that will begin by August 20th. A final management plan for the winter is expected before the winter season begins around December 15th. The temporary rules will be in place while the issue of snowmobile use in both parks is challenged in court.