ANTICYCLONE
– A large area of high pressure around which the winds blow clockwise in the Northern Hemisphere.
ARCTIC AIR
– a mass of very cold, dry air that usually originates over the Arctic Ocean north of Canada and Alaska.
ARCTIC HIGH
– a very cold high pressure that originates over the Arctic Ocean.
ASOS
-Automated Surface Observing System. Observes sky conditions, temperature and dewpoint, wind direction and speed, and barometric pressure.
ATMOSPHERE
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ATMOSPHERIC RIVER
– a long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
ATWC
-Alaska Tsunami Warning Center, located in Palmer, AK.
AVALANCHE
– a large mass of rapidly moving snow down a steep mountain slope.