A form of lift occurs when the wind meets a mountain, cliff, ridge or hill. The air is deflected up the windward face of the ridge forming lift. Gliders can climb in this rising air by flying along the ridge making long passes. Another name for flying with ridge lift is slope soaring.
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Check the site guide for locations. Ridges good for soaring exist all over the country
You need wind speed of anywhere from 8pm to 15mph blowing fairly straight into a ridge. Anything more than 45 degrees cross starts getting tricky. The more cross the wind, the higher the velocity required. The speed required also depends on the shape and height of the ridge. Some ridges are more optimal than others, but in general the steeper the ridge the better. Ridges can be as small as 5 feet tall and can sill be soared in higher winds. Really tall ridges, say 200+ feet that are steep can be soared in as little as 8mph.