Cold Pool - A region of relatively cold air, represented on a weather map analysis as a relative minimum in temperature surrounded by closed isotherms.
The distance that cold pools of air can spread under the influence of the Coriolis force. A cold pool will initially spread out toward and under warmer air because of higher pressure under the cold, denser air.
Such systems typically are weakening and are slow-moving, and are less likely to produce severe weather than tilted systems. However, cold pools aloft associated with vertically-stacked systems may enhance instability enough to produce severe ...
MID-LEVEL COOLING
Local cooling of the air in middle levels of the atmosphere (roughly 8 to 25 factors are equal. Mid-level cooling can occur, for example, with the approach of a mid-level cold pool.
cut-off low - A cold low that has grown out of a trough and become displaced out of the basic westerly current and lies equatorward of this current. See cutting-off process, cut-off high, cold pool.
middle levels of the atmosphere (roughly 8,000-25,000' or 2,000-8,000m), which can lead to destabilization of the entire atmosphere if all other factors are equal. Mid-level cooling can occur, for example, with the approach of a mid-level cold pool.
However, cold pools aloft associated with vertically-stacked systems may enhance instability enough to produce severe weather. Very Low Frequency (VLF)That portion of the radio frequency spectrum from 3 to 30 kHzVery Windy30 to 40 mph winds.
 See also: Pressure, Weather, Storm, Thunderstorm, Surface
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