the water-vapor content of the air. Absolute humidity is the weight of the water in a given volume of air.
Waterspout, a whirlwind over water. Within the waterspout is an area of rising air currents and relatively low pressure. See more »
Whirlwind, a general term for any whirling body of air. The term is most often applied to whirling air created by the swift rising of warm air from near the surface of the earth. See more »
Wind, the movement of air over the earth's surface. The upward movement of air is known as an updraft; movement downward, as a downdraft. See more »
Wind Shear, in meteorology, a difference in the speed or direction of the wind, or in both the wind's speed and direction, at two points a short distance apart. See more »