How to make a quinzhee
Shovel snow
Create a rounded mound about 12 feet across and six feet high.
Make it solid
Pat down the outside of the snow to help it consolidate. If you have time, let the snow settle for a few hours.
Find some twigs
Collect two dozen twigs and insert them into the mound to a depth of at least 12 inches. They should be spaced evenly and will let you gauge the thickness of the dome when you are digging from the inside.
Open it up
Dig an entrance tunnel into the most protected side of the mound.
Hollow out the inside
Leave the excavated snow near the entrance to act as a windbreak.
Finish it up
Stop digging when you see the ends of the twigs from the inside.