I dont know about 70 --but on our last day here in vt iwas up on a mt across from my house and the wind was outragous, made me a lil nervous when really good size branches were falling, Scaryest thing was (not to drag on but.....) about 150yrds from sitting watched this 6in (roughly) come toppling over. but wind normally--even fairly high dont bother me, just the crashing of crap coming out of trees makes me leary.