Simple, keep both skis together, parallel, at same elevation and equally weighted, maintain the balance and keep going, ski like water flows, the flotation of the powder will take care of the rest.
How do you handle 31” of Sierra powder? Don’t, if you are not an experienced [deep] powder skier, you maybe drown in there if you fail, and most likely you would fail. No kidding...
“Avalanche dogs on Tuesday morning found a missing Seaside skier dead under massive amounts of snow powder, less than 100 feet from a groomed run at Heavenly Mountain Resort, authorities said...”
Another reality of resort skiing, a perfectly groomed trail in the morning becomes treacherous bumpy and icy skiing in the afternoon, especially, if you have to also deal with the holiday crowds. Compare.