Golf umbrella in the mountains, or even our spring coastal winds here? Might as well be attached to a hang-glider and find out where you're going to land.
I once spent a night inside a crack in the huge boulder on a peak summit, trying to hold my tent together from inside, with hurricane force winds roaring overhead as loud as a jet. The next morning it was quiet, and there were 8 ft long icicles projecting completely horizontal from the face of the cliff. If it hadn't been for that large crack in the boulder, everything would have blown off, including me. And that was hardly a unique experience for me, back when I took my Sinar monorail system everywhere, extra-long bellows included.
Technique-wise, I could still be doing that. I got many great shots by learning how to anticipate and time the winds. But now I'm just too old and lazy. Had high winds most of last week, and finally a calm afternoon yesterday. Simply grabbed the 6X9 RF. I am hoping for a reasonable weather break in January, like we often get here, to get out with the 8x10 again. But everything is so unpredictable these days, climate-wise.