Fairly uniform precipitation composed exclusively of fine drops with diameters of less than

0.02 inch (0.5 mm) very close together. Drizzle appears to float while following air currents,

although unlike fog droplets, it falls to the ground

Precipitation, either in the form of drops larger than 0.02 inch (0.5 mm), or smaller drops which, in contrast to drizzle, are widely separated

Precipitation of snow crystals, mostly branched in the form of six-pointed stars.

Precipitation of very small, white, and opaque grains of ice.

A fall of unbranched (snow crystals are branched) ice crystals in the form of needles, columns, or plates.

Precipitation of transparent or translucent pellets of ice, which are round or irregular, rarely conical, and which have a diameter of 0.2 inch (5 mm), or less.

Precipitation in the form of small balls or other pieces of ice falling separately or frozen together in irregular lumps.

Precipitation of white, opaque grains of ice. The grains are round or sometimes conical. Diameters range from about 0.08 to 0.2 inch (2 to 5 mm).

Precipitation type that is reported if the automated station detects the occurrence of precipitation but the precipitation discriminator cannot recognize the type.

Any phenomenon in the atmosphere, other than precipitation, that reduces the horizontal visibility.

A visible aggregate of minute water particles suspended in the atmosphere that reduces

visibility to less than 7 statute miles but greater than or equal to 5/8 statute miles.

A visible aggregate of minute water particles (droplets) which are based at the Earth's surface

and reduces horizontal visibility to less than 5/8 statute mile and, unlike drizzle, it does not fall to the ground.

A suspension in the air of small particles produced by combustion. A transition to haze may

occur when smoke particles have traveled great distances (25 to 100 miles or more) and when the

larger particles have settled out and the remaining particles have become widely scattered through the atmosphere.

Fine particles of rock powder that originate from a volcano and that may remain suspended in the atmosphere for long periods.

Fine particles of earth or other matter raised or suspended in the air by the wind that may have occurred at or far away from the station which may restrict horizontal visibility.

Sand particles raised by the wind to a height sufficient to reduce horizontal visibility.

A suspension in the air of extremely small, dry particles invisible to the naked eye and

sufficiently numerous to give the air an opalescent appearance.

An ensemble of water droplets torn by the wind from the surface of an extensive body of water, generally from the crests of waves, and carried up a short distance into the air.

An ensemble of particles of dust or sand, sometimes accompanied by small litter, raised from the ground in the form of a whirling column of varying height with a small diameter and an approximately vertical axis.

A strong wind characterized by a sudden onset in which the wind speed increases at least 16 knots and is sustained at 22 knots or more for at least one minute

Particles of sand carried aloft by a strong wind. The sand particles are mostly confined to the lowest ten feet, and rarely rise more than fifty feet above the ground.

A severe weather condition characterized by strong winds and dust-filled air over an extensive area.