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E - continued
EVACUATION TIME: The
lead-time that a populated coastal area must have to
safely relocates all residents of vulnerable areas from an approaching
hurricane. This time can also be perceived as the necessary amount
of time between the local official evacuation order and the arrival
of sustained gale force winds (40 mph) and/or flooding.
EXPLOSIVE DEEPENING: A decrease in the minimum sea-level pressure of a tropical cyclone of 2.5 mb/hr for at least 12 hours or 5 mb/hr for at least six hours.
EXTENT OF EVACUATION: The identification of vulnerable people who must evacuate based on estimated damage and/or homes susceptible to hurricane force winds.
EXTRATROPICAL: A term used in advisories
and tropical summaries to indicate that a cyclone has
lost its "tropical" characteristics. The term
implies both poleward displacement of the cyclone and
the conversion of the cyclone's primary energy source
from the release of latent heat of condensation to baroclinic
(the temperature contrast between warm and cold air masses)
processes. It is important to note that cyclones can
become extratropical and still retain winds of hurricane
or tropical storm force.
EXTRATROPICAL CYCLONE: A cyclone in the middle and high latitudes often being 2000 kilometers in diameter and usually containing a cold front that extends toward the equator for hundreds of kilometers. These cyclones forms outside the tropics, the center of storm is colder than the surrounding air, have fronts and the strongest winds in the upper atmosphere.
EYE: The center of a tropical storm or hurricane characterized by a roughly circular area of light winds and rain-free skies and the lowest pressure. An eye will usually develop when the maximum sustained wind speeds exceed 78 mph. It can range in size from as small as 5 miles to up to 60 miles (20-50 km) but the average size is 20 miles. In general, when the eye begins to shrink in size, the storm is intensifying.
EYE WALL: An organized band of convection surrounding the eye, or center, of a tropical cyclone. It contains cumulonimbus clouds, severest thunderstorms, heaviest precipitation and strongest winds.
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