Here are a few top tips from Mark Gear for skiing deep powder snow!

A two footed platform
Aim to push both skis into the snow when intitiating your turns, this will provide you with a two-footed platform of pressure through your turns. It's important to change your edges simultaneously and not sequentially.
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Make smooth shaped turns
Go for smooth fluid movements, this will encourage smooth shaped turns. Any abrupt movements or turns will have an abrupt effect on your balance. Smooth turns and a good rhythm are essential for a fluid powder skiing run.

Push the heels downwards
Not to be confused with leaning back! In deep snow we should push the heels downwards a little to keep the ski tips up. This will stop the feeling of the ski tips wanting to dive deep into the snow which is oftern proceeded with the classic forward face plant.
Remember to pole plant
Smooth coordinated pole plants are very important. This will help you to build fluidity and rhythm into your run. The pole plant also helps for commiting to the turn and helps move your body forwards and in the direction of the turn.
Hope you enjoy the ski tips and all that great powder!
Mark Gear Head Coach All Mountain Performance
http://allmountainperformance.com/advanced-all-mountain-ski-courses-1