Wouter is right about the wing mast being a danger when loose.
I had a bad scene in a 50 knot blow at my beach. I keep my boat mast up and used the same common sense approach...let mast turn to wind.
Problem is when the gusts got high enough with the boat aimed directly into the wind the mast started to occilate. It vibrated so fast and intensely that it started to pull the pegs which were driven 800 into the ground right out. The whole boat was shuddering and trying to fly.
Tie the boat down well. Tie mast off using spanner and halyard back to rear beam.
When you know it is a storm of over 40 knots, pull the mast down.

I differ very much with Wouter about hitching to side stays. At the time I spoke of I had straps over the bows to pegs and from the side stays to pegs. The energy broke one of the chain plates.
I tie off to the main beam now. The stays front and back are a bad idea as they are engineered to be strong on an upward pull, not a downward one and get 'worried' and will leak or break.