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HIGH-PRESSURE SYSTEM: An area of relative pressure maximum that has diverging winds and a rotation opposite to the earth's rotation. This is clockwise the in Northern Hemisphere and counterclockwise in the Southern Hemisphere. Also known as an anticyclone, it is the opposite of an area of low pressure or a cyclone.
HIGH WIND ADVISORY: Announcement issued by the National Weather Service for substained winds exceeding 25 mph (19 knots).
HIGH WIND WATCH/WARNING: A high inland wind watch/warning issued by the National Weather Service when either of the following occurs or are expected to occur in the near term: 1) Sustained surface winds (1-minute average) of 40 mph (35 knots) or greater lasting for 1 hour or longer; or 2) Sustained winds or gusts of 58 mph (50 knots) or greater for any duration.
HUMIDITY: The amount of water vapor in the air.
HURRICANE: A tropical cyclone in the Northern Hemisphere with substained winds of at least 74 mph (64 knots) or greater in the North Atlantic Ocean, Caribbean Sea or Gulf of Mexico. These winds blow in a large spiral around a relatively calm center of extremely low pressure known as the eye. Around the rim of the eye, winds may gust to more than 200 miles per hour. The entire storm, which can be up to 340 (550) in diameter, dominates the ocean surface and lower atmosphere over tens of thousands of square miles. Hurricanes draw their energy from the warm surface water of the tropics (usually above 27 Celsius) and latent heat of condensation, which explains why hurricanes dissipate rapidly once they move over cold water or large land masses.
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