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Air masses are how weather travels through out the world and the weather creates weather patternsAir masses and accompanying fronts do not remain stationary for long Although their movements are never exactly the same they do exhibit some patterns that help meteorologists and others predict the weather The boundary between two air masses is called a front As a result moving fronts indicate a change in the weather The fronts are moved in things called Jet Streams On a weather map fronts are drawn where there is a large change in temperature and a shift in wind direction A front can also be described as the boundary between adjacent Highs with different conditions Meteorologists often call climate patterns oscillations since they change on time scales ranging from days to decades Interactions between the atmosphere and the oceans are at the core of most of the patterns The atmosphere and ocean push and pull against one another When one does something it affects the other Since the ocean is much slower to respond to environmental changes than the atmosphere the two players are unequal partners Jet streams are bands of very strong winds which occur at limited altitudes usually in the 30-40000 feet area They can be over 150 miles wide and 1000 miles long and can travel at over 250 mph Like most winds they occur where there is a difference between hot and cold and in the jet streams case this means around the joins of tropical and polar air The jet stream is a river of fast flowing air at high altitudes above the earth that generally flows from west to east over the mid-latitudesTo be called a jet stream the winds should be faster than 57 mph Usually the jet stream separates cold polar air to its north from warmer air to its south During major
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