How do I keep a grill cover from blowing off in the wind?

Reviewers consistently flag wind as the biggest failure point — one r/grilling poster described a covered grill tumbling 15 feet in a storm. Covers with adjustable straps, drawstring hems, and windproof buckles or clips fare best. Snug fit and side-tie-downs come up far more often than fabric thickness when owners describe what actually keeps a cover in place.