qIn cases when winds are strong and blow with a component across
the short axis of a
lake, wind-parallel rolls may form.
q When the cool air moves
across the warm lake, cooler air aloft must sink to replace the warmer rising air.
qThese rising and sinking motions often take the form of rolls
that align parallel to
the wind.
qThe upward branches (develop clouds and precipitation) of the
rolls are typically
1 to 2 km wide and spaced (by the clear sky associated with the sinking branches) up to 10km.