Anabatic = moving upwards ; Katabatic = moving downwards . Anabatic winds which flow upslope of a mountain from lower valleys develop during daytime in calm sunny weather. They are warm winds which blows up a steep slope or mountain side, driven by heating of the slope through insolation . Air which is in contact with slopes that are warmed expands upward and cool and sinks over neighbouring valleys. Anabatic winds are usually slow , at only 1-2m/s and are rarely important expect near coasts where they can increase the strength of sea breezes. Anabatic winds are particularly useful to soaring glider pilots who can use them to increase the aircraft's altitude. Anabatic winds can be detrimental to the maximum downhill speed of cyclists. Katabatic winds are downslope winds flowing from high elevations of mountains, plateaus, and hills down their slopes to the valleys or plains below. During and after sunset ,
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