Those cracks open and close virtually every day, depending on wind direction. Only way to know for sure is to talk to someone who's there, or go look your self. I think South and Southwest are the winds you don't want. I'm no expert, but know a few who spend quite a lot of time out there. A buddy of mine posted a video on facebook of them crossing one of those cracks on a side by side Saturday night. Didn't look like much fun, unless you like being puckered up.