The canvas covered and metal framed portable garage that most folks use around here is from Costco: Properly anchored and guy wired, they will take 30+ mph winds pretty easily.
One I had at Lake Amador for my CD-22 held up (according to a local, I was in the Bay Area) up to close to 50-60 mph, then folded up and ripped apart like a tornado hit it. Bent 2" steel tube frames like macaroni!
I don't see them listed on the Costco site, maybe they've been discontinued? You might check at your local retail store. The best part was the ~$175 price tag!
Joe.