Stamp out a good, level platform before you set up the tent. Use rocks as anchors. If you leave the tent for the day, and expect windy conditions, place something heavy inside the tent (more rocks...or your partner).
In similar snow conditions, my N.F VE-24 blew away at Sam Mack Meadow, while three of us were battling winds while climbing in the Palisades (we gave up after being unable to stand up in the wind). It had been anchored with snow-flukes and skis. Anchors ripped out in 80 MPH winds. We found the tent and skis, but the rain-fly disappeared into the stratosphere. Only one tent nearby survived undamaged, and it had been anchored to trees by a climbing rope...