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Weather Terms




          In this section you'll find many weather terms and their definitions. All of these weather terms are defined in as easy-to-understand terms as possible. Within each definition, if there is another word that has a meteorological definition, you can click-on it for its definition, as well. The weather terms are broken-up into alphabetical order by their first letter. These definitions come from valid meteorological sources. I invite you to see the bottom of this page for all the information sources I used to compile this list of definitions. If you have a weather term that is not listed on this site and you want to know what it means, e-mail the Webmaster for help.

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J


JET STREAM

An area of strong winds that are concentrated in a relatively narrow band in the upper troposphere of the middle latitudes and subtropical regions of the Northern and Southern Hemispheres. Flowing in a semi-continuous band around the globe from west to east, it is caused by the changes in air temperature where the cold polar air moving towards the equator meets the warmer equatorial air moving polarward. It is marked by a concentration of isotherms and strong vertical shear. Various types include the arctic, the low level, the polar, and the subtropical jets.









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