If you're ever wondering when to catch the river in the winter as it explodes with Yellowstone-like steam, just keep an eye on the temperature forecast.
Friday, Jan. 6 of 2013 was an interesting case in point. With air temps plunging into the negative, the river's water temperature on that day was obviously lagging a bit behind, thus the beautiful swirls of mist that shrouded the banks until well after 11 a.m..
Check it out.