In the Chinook, after 30 knots, that's when you pull out the charts and see if the windgust speeds will take you out of limits for rotor shutdown. The Chinook has 30inch blades and like to sail in very gusty winds... but I've found the charts pretty conservative. Having said that, if you don't obey the charts, then you do so at your own peril (and the Accident Investigation Board will have your guts for garters!)
Because both rotors intermesh and (almost) meet over the mid-cabin, the charts show you the best wind azimuths to try and get the blades to sail UP as they approach mid-cabin an thus afford the greatest clearance from blade and fuselage. Where possible, you park so as to keep the mean wind direction within these 'preferred' azimuth arcs if the wind speed is of concern.
CB