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Warm
Front
A warm front is an area of transition between two different airmasses
(see A is for… section), such that warmer air is replacing the
colder. The approach of a warm front often brings precipitation and
a fall of atmospheric pressure. The passage of a warm front usually
brings a steadying of pressure, reduction or cessation of precipitation
and a veering of wind (in the northern hemisphere). A warm front is
displayed on weather charts as a line with red semi-cicles along its
length.
Warm
Sector
The area of relatively warm, moist air sandwiched between the warm
front and cold front associated with a depression (low pressure
area).
Weather
Changing atmospheric conditions as they affect man. In meteorology,
the word "weather" is used in the more limited sense to
describe the state of sky (cloud amounts) and the occurrence of
any precipitation or mist or fog.
Wind
The movement of air, relative to the earth. Wind has a horizontal
and a vertical component, although the horizontal is usually much
greater than the vertical. By convention, wind direction describes
where the wind is blowing FROM, e.g. a westerly wind is blowing
FROM the west. Wind speed is normally measured using an anemometer,
in units such as knots, miles per hour or metres per second, or
estimated using the Beaufort Scale (see B is for… section).
Wind-Chill
The ability of strong winds, combined with low temperatures, to
cool warm blooded animals (such as humans) more than would be felt
by the low temperatures alone.
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