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From what I've been able to tell by comparing my own local seeing to those maps it seems that once you pass the 30-40 m/s mark it will have some effect, though with the bulk of my observing done from suburban skies (though not "big city" suburban) it may be that a good dark sky will be visibly affected by even less wind.
Things definitly deteriorate rapidly as the speed increases past and over that 50 m/s (100mph) mark, and I suspect it affects astro imaging more than it does visual observing.
All I can say is I pity anyone who suffers those 200+ mph winds!
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