– Sustained winds of 15 to 25 mph.

– Clouds which cover between 6/10 and 9/10 of the sky.

– Cold Air Advection. The movement of colder air toward a fixed point on the earth’s surface.

– the absence of apparent motion in the air.

– Temperature inversion which prevents convection from occurring.

– A category. Usually refers to a category of precipitation given by the forecast models.

– The height of the lowest layer of clouds, when the sky is broken or overcast.