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Fronts and Lows
– A front can range from 200 meters to 200 kilometer in width, can be
as high as 5 kilometers and as long as 2000 kilometers.
– Fronts are most common at mid-latitudes where northward moving
tropical air masses and southward moving polar air masses often
– Air masses on either side of the front may differ in temperature, in
humidity, or in both.
– Fronts can have steep slopes (ranging from 1/50 to 1/300).
– Fronts usually bring precipitation.
• Weather associated with a particular front depends on the types of
air masses involved and the speed at which the front is moving.
• Fronts are usually classified according to the temperature of the
advancing front.
• There are four basic kinds of fronts: