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The formation of a lee low may happen if a current of air flows towards…

  • A
    the south along a coastline, in northern latitudes, and to the north, in southern latitudes.
  • B
    the east, perpendicular to a north-south-oriented mountain range that forms a barrier.
  • C
    a large canyon with a river originating from a glacier.
  • D
    the east or the west along an east-west-oriented mountain ridge.

Refer to figure.
LEE LOW/TROUGH

Small-scale cyclone that forms on the leeward, or downwind, side of mountain barriers as the general air flow is disturbed by the mountain. A lee trough's development begins as the air flows down the lee side of a mountain warming and compressing. The atmosphere counteracts the compression by producing convergence at the surface, and forcing air to rise. This action causes the pressure at the surface to decrease. Eventually, a trough forms in the lee of the mountains. 
A pressure trough formed on the lee side of a mountain range in situations where the wind is blowing with a substantial component across the mountain ridge.

  • A downslope wind will be most intense if the windflow is perpendicular to the mountain range and the winds have a high velocity

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