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W
WARM FRONT: The leading edge of an advancing warm air mass that is replacing a retreating relatively colder air mass. Generally, with the passage of a warm front, the temperature and humidity increase, the pressure rises, and although the wind shifts (usually from the southwest to the northwest in the Northern Hemisphere), it is not as pronounced as with a cold frontal passage. Precipitation, in the form of rain, snow, or drizzle, is generally found ahead of the surface front, as well as convective showers and thunderstorms. Fog is common in the cold air ahead of the front. Although clearing usually occurs after passage, some conditions may produced fog in the warm air. See occluded front and cold front.
WARNING: An announcement that is issued when severe weather: 1) has developed; 2) is already occurring and reported; or 3) is detected on radar. Warnings state a particular hazard or imminent danger, such as tornadoes, severe thunderstorms, flash and river floods, hurricanes, etc
WEATHER SURVEILLANCE RADAR (WSR-88D): The newest generation of Doppler radars. These radar units, with help from a set of computers, show very detailed images of precipitation and other phenomena, including air motions within a storm.
WINDWARD: The direction from which the wind is blowing. Also known as the upwind side of an object. It is the opposite of the downwind or leeward side.
Z
ZULU TIME (Z): One of several names for the twenty-four hour time that is used throughout the scientific and military communities. Other names for this time measurement are Universal Time Coordinate (UTC) or Greenwich Mean Time (GMT). See Greenwich Mean Time for more information.
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