Mt. Rainier shows off again with lenticular cloud display

December seems to be a magnet for great cloud displays on Mt. Rainier, and this December was no different.

Ryan Verwest submitted these photos taken on Dec. 1 -- two separate but equally amazing lenticular cloud events.

The clouds are caused when Mt. Rainier's summit creates turbulence. And when the air lifts, it condenses into a cloud, but then as the air sinks, the air dries out and is no longer visible. While these clouds look as if they float in place, there is actually a steady flow to them.

In addition, there was a colorful prism effect shown, as ice crystals in clouds refracted the sunlight into the colors of the rainbow.

Here are some of Verwest's other great photos: