Well silver normally shuts down the gondola anything above 65mph but it doesn't happen a lot.
It depends on the altitude and direction of the winds, as an employee of several ski resorts, we use anemometers to measure the wind speed in different areas and make decisions based on patterns, we might decide to place a short wind hold or we might evac and shut down chairs entirely, the gondola is more high tec than the fixed grip chairs and can handle a bit more wind than a chair, as well as the safety factor of a gondola box versus an open exposed lift chair, if the winds hit or go near triple digits you can expect delays and shut downs
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