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[ A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | R | S | T | U | V | W | Z ]
J
JET STREAM: Relatively strong winds concentrated within a narrow current in the atmosphere.
K
KNOT: A unit for the measurement of speed in the nautical system. It is the nautical miles per hour.
L
LANDFALL: The term used to describe where the hurricane eye actually passes over land, usually used to describe the continental States rather than islands in the Caribbean.
LATITUDE: The location north or south in reference to the equator, which is designated at zero (0) degrees. Parallel lines that circle the globe both north and south of the equator. The poles are at 90 degrees North and South latitude.
LEEWARD: The side of an object or obstacle, such as a ship's sail, a mountain, or a hill, furthest away from the wind, and therefore, protected from the direct force of the wind. The opposite of windward.
LOCAL ACTION STATEMENT: A release prepared by a National Weather Service Forecast Office in or near a threatened area giving specific details for its area of responsibility.
LONGITUDE: The location east or west in reference to the Prime Meridian, which is designated as zero (0) degrees longitude. The distance between lines of longitude are greater at the equator and smaller at the higher latitudes, intersecting at the earth's North and South Poles. Time zones are correlated to longitude.
LOW: A region of low pressure.
LOW-LEVEL INVEST: An investigative mission for tropical disturbances to: 1) determine the existence or non-existence of a "closed circulation" (winds blowing in a complete circle); 2) supply weather observations in required areas, and; 3) determine the vortex center, if any. These missions are flown at 500 to 1500 feet.
LOW-PRESSURE SYSTEM: An area of a relative pressure minimum that has converging winds and rotates in the same direction as the earth. This is counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. Also known as an cyclone, it is the opposite of an area of high pressure, or a anticyclone. See closed low, cold low, and cut-off low for further examples.
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