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WEATHER TERMINOLOGY A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z A ABSOLUTE HUMIDITY A type of humidity that considers the mass of water vapor present per unit volume of space. Also considered as the density of the water vapor. It is usually expressed in grams per cubic meter. ABSOLUTE INSTABILITY When the lapse rate of a column of air is ...

Glossary of Meteorological Terms - A - Acid Rain- rain that is especially acidic as the result of water vapor condensing onto particles of sulfate or nitrogen oxide. Adiabatic- changes in temperature caused by the expansion (cooling) or compression (warming) of a body of air as it rises or descends in the atmosphere. Advection- the horizontal transport of air, moisture, vorticity or other ...