High An area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone. The amount of water vapor in the atmosphere. Normally applied to such storms in the Atlantic Basin and the Pacific Ocean east of the International Date Line. Crystals A barely visible crystalline form of ice that has the shape of needles, columns or plates.
Ice crystals are so small that they seem to be suspended in air.
An accumulation of broken river ice caught in a narrow channel that frequently produces local floods during a spring break-up. . An unseasonably warm period near the middle of autumn, usually following a substantial period of cool weather. Jet Stream Strong winds concentrated within a narrow band in the upper atmosphere. It normally refers to horizontal, high-altitude winds. An area of low pressure, usually accompanied by cyclonic and inward wind flow.