communityweather.org.nz

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Definitions (754)

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debris cloud


Considered a rotating cloud of debris or dust that is on the ground or near the ground. The debris cloud appearing beneath a thunderstorm will most likely confirm the presence of a tornado.
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cyclonic flow


Winds that blow in and around a cyclone, that is counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere.
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polar front


A semi-continuous, semi-permanent boundary between polar air masses and tropical air masses. An integral part of an early meteorological theory known as the Polar Front Theory.
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valley breeze


An anabatic wind, it is formed during the day by the heating of the valley floor. As the ground becomes warmer than the surrounding atmosphere, the lower levels of air heat and rise, flowing up the mo [..]
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zonal flow


The flow of air along a latitudinal component of existing flow, normally from west to east.
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zonal index


The measure of the strength of the westerly winds of the middle latitudes. It is expressed as the horizontal pressure difference between 35 degrees and 55 degrees latitude, or as the corresponding geo [..]
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convective condensation level


The height at which a parcel of air, if heated sufficiently from below, will rise adiabatically until it is just saturated.
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equatorial trough


The quasi-continuous area of low pressure between the subtropical high pressure areas in both the Northern and Southern Hemisphere.
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foehn


A warm dry wind on the lee side of a mountain range, whose temperature is increased as the wind descends down the slope. It is created when air flows downhill from a high elevation, raising the temper [..]
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frontal passage


It is the passage of a front over a specific point on the surface. It is reflected by the change in dew point and temperature, the shift in wind direction, and the change in atmospheric pressure. Acco [..]
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