Denver was from almost north at 55 or 65 kts at 12k' at the time. Steamboat was MVFR to worse just prior. I stayed in Granby, to the southeast of Steamboat, on Sunday to wait for VFR and calm winds the next day. The day before, I went from 9k to 16k in minutes in a 182 at almost idle on the way to go skiing. On the other (down) side of the wave, I pegged the VSI at 75 mph or so ground speed and normal cruise power and airspeed. It was glassy smooth, of course, but the rotors beneath the waves in these conditions can be other worldly.
Northerlies along the divide can be brutal, and this time it brought pockets of ice and snow with it in places in the mountains while the rest of the state enjoyed spring weather.
I've found downward wave activity over rabbit ears pass on more than one occasion, and the up side is by the flat tops to the west. Things can happen really fast on either end of the wave.
Someone made a safe forced landing just west of the flat tops the same day apparently. I don't think it was a coincidence.