Slope soaring is a gliding technique used to maintain altitude by flying in the updraft produced by wind blowing up the face of a steep slope. Model glider pilots commonly refer to this as "slope gliding" or "sloping". Pilots of full-sized gliders also call the lift "ridge lift" and its use "ridge flying". They use it to fly hundreds of kilometers where there is suitable terrain, such as in the Ridge-and-valley Appalachians. Birds, such as many seabirds (in particular albatross) and raptors, also use slopes in this way.
The rising air from the slope is used to keep gliders airborne. Although a glider is always descending through the air, it will climb if the surrounding air is rising faster than the glider's sink rate.
Timing and magnitude of Broad-winged Hawk Migration at Montclair Hawk lookout, New Jersey, and Hawk Mountain Sanctuary, Pennsylvania.(Author Abstract)
Dec 01, 2002; The Broad-winged Hawk (Butec platypte rus) is a small, forest-dwelling, migratory buteo that breeds in central and eastern Canada...