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Anticyclone........................... region of relatively high atmospheric pressure

Barometer............................instrument for determining atmospheric pressure

Cloud....................................visible accumulation of minute water droplets suspended in the atmosphere

Depression............................an area of Low Pressure with closed isobars

Equinox.................................time of the year of equal daylight and night Mar21/22 Sept 21/22

Fog.......................................visible suspension of water droplets in the atmosphere near land surface

Gale......................................wind reaching 45mph or more or 43knots

Hail....................................... solid precipitation in the form of balls or pellets of ice

Isobar.....................................a line joining areas of equal atmospheric pressure

Jet Stream...............................narrow current of high speed winds in lower stratosphere

Knot.....................................speed of one nautical mile per hour, measuring wind equal to 1.853km/h

La Nina.................................upwelling of cold water off the coast of South America causing noticeable changes in earths climate mostly cool

Maritime Climate.....................climate governed by an areas proximity to the sea esp islands

Nightglow................................faint airglow emission that is detectable at night

Occlusion..............................front that develops at the later stages of a depressions lifetime when the cold front overtakes the warm front

Permafrost..........................permanently frozen ground where summer heating is insufficient to counter low temperatures attained during winter

Q-Burst................................abnormal spike in the low frequency radio noise generated by thunderstorms

Rainbow.............................optical phenomena when sunlght is refracted or reflected by falling raindrops

Sea-Breeze........................... local breeze that occurs during differential heating of land and sea

Thunder...............................sound produced by lightning discharge from heating and expansion of air by electrical current

Upwelling..............................movement of water to the surface from deeper in ocean

Vog.....................................volcanic smog

Warm Sector.........................triangular region that lies between warm and cold front in early stages of a depression

Xenon....................................inert gas that occurs at extremely low concentration in the atmosphere

Yellow Dust..........................smog like pollution in Beijing

Zephyr................................ light warm breeze

IN PROGRESS...