I have a diy tarp made from polyurethane, that withstood a night of 40mph gusts in the Linville Gorge. It was my first tarp and is twice the weight of a silnylon tarp, but it's pretty tough. It's 11'x10' and I think it weighs about 27oz. As was stated above, though, I'm not sure if there is any material capable of withstanding continuous 60mph winds. That's tropical storm weather and I don't tend to camp in that, on purpose.
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