I'll call in 15-20 mph winds just about every time. Do I prefer it? Nope, but I'll take it over sitting at home and channel surfing!
When calling in those types of winds, I try to find an area with a little more topography so I can get in a low spot or I try to find an area with larger trees to help block the wind. Also, keep track of the wind direction and kill 'em before they cut your wind.
Regarding higher winds, I usually pack it up if the wind gets much higher than 20 mph. No sense in having coyote after coyote wind you from hundreds of yards away.......that is if they are even moving in those winds to begin with. /ubbthreads/images/graemlins/frown.gif I've seen them suddenly "turn off" when the winds get higher. I think they'd rather bed down and wait it out vs. trying to hunt. If you'll notice, most of the prey animals like jackrabbits will typically bed down in higher winds, too.
Hope this helps and let us know how you do!! /ubbthreads/images/graemlins/grinning-smiley-003.gif
Take care and God Bless,
Rusty