fully erect bright yellow wind indication sock

yellow blue sky wing wind flight parachute aircraft vehicle parachuting flag flower paragliding fully erect bright indication sock post indicating strong clouds tree leaves blowing erect windsock wind windy gust air sock flag tree leaves cloud clouds pole post sky direction indicating indication fair favorable weather meteorology forecast speed windage airspeed knots crosswind aviation flight safety guidance marker visible tube cylinder cone shape airport yellow blue south africa close-up photograph color colors background backgrounds horizontal