Maybe I'm stupid, or maybe it has already been said in a former thread.

But why don't you turn the cat 180 degrees over, bottom up.

Bind and tie the rest of the tarp underneath and set the whole thing under inclination for getting rid of the water and snow.
The advantage is less windsensitive and you have to store the mast somewhere inside; which is anyway much better.

The whole installation is a bit flatter and more down to earth, so seems less vulnerable.