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extratropical cyclone
Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are an everyday phenomenon which, along with anticyclones, drive the weather over much of the Earth. They are capable of producing anything from cloudiness and mild showers to heavy gales and thunderstorms. These types of cyclones are defined as synoptic scale low pressure weather systems that occur in the middle latitudes of the Earth (outside the tropics) not having tropical characteristics, and are connected with fronts and horizontal gradients in temperature and dew point otherwise known as "baroclinic zones".
==Terminology==
Extratropical cyclones encompass a class of storms with many names. The term "cyclone" applies to numerous types of low pressure areas. The descriptor ''extratropical'' signifies that this type of cyclone generally occurs outside the tropics in the middle latitudes of Earth. The term ''mid-latitude cyclones'' may be used because of where they form; post-tropical cyclones if extratropical transition has occurred.〔 Weather forecasters and the general public often describe them as "depressions" or "lows". Terms like frontal cyclone, frontal depression, frontal low, extratropical low, non-tropical low and hybrid low are often used as well.
Extratropical cyclones are classified mainly as baroclinic, because they form along zones of temperature and dewpoint gradient known as frontal zones. They can become barotropic late in their life cycle, when the distribution of heat around the cyclone becomes fairly uniform with its radius.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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