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A weather map is a tool used to display information quickly showing the analysis of various meteorological quantities at various levels of the atmosphere. Maps utilizing Isotherm s show probable location of Weather Fronts . Isotach maps of the upper atmosphere show where the Jet Stream lies. Streamline s show areas of converging and diverging winds, particularly in the tropics. At the surface, the popular type of weather map is the Surface Weather Analysis , which uses Isobar s to depict areas of High Pressure and Low Pressure , as well as help locate weather fronts. Special weather maps in aviation show areas of icing and turbulence. USES A weather map is used to depict a picture of the atmosphere at a specific time in the free . PLOTTED WINDS See Also: Station model Winds have a standard notation when plotted on weather maps, whether they be of the surface, some higher level in the atmosphere, or to depict temperature or moisture Advection . More than a century ago, winds were plotted as arrows, with feathers on just one side depicting five knots of wind, while feathers on both sides depicted 10 knots of wind. The notation changed to that of half of an arrow, with half of a flag depicting five knots and a full flag depicting 10 knots. TYPES OF ANALYSES PERFORMED Isobaric analysis An isobaric analysis involves the construction of lines of equal mean . Isotach analysis Isotachs are lines of equal wind speed drawn on weather maps. They are helpful in finding maxima and minima in the wind pattern. Minima in the wind pattern aloft are favorable for Tropical Cyclogenesis . Maximum in the wind pattern at various levels of the atmosphere show locations of the upper level jet stream and low level jets, both of which play a role in severe weather. Certain quadrants of upper level wind maxima are areas where upward vertical motion is preferred. Isotherm analysis Isotherms are lines of equal temperature drawn on weather maps. Isotherms are drawn normally as solid lines at a preferred temperature interval.American Meteorological Society. Air Temperature Patterns. Retrieved on 2007-05-10 . They easily show areas of temperature gradient, which is useful in finding fronts, located normally at the warm edge of temperature gradients. They also show areas above and below freezing, which is useful in determination of precipitation type. Streamline analysis A streamline analysis is a series of arrows oriented parallel to wind, showing wind motion within a certain geographic area. C's depict cyclonic flow or likely areas of low pressure, while A's depict anticyclonic flow or likely positions of high pressure areas.. TYPES OF WEATHER MAPS Surface weather analysis See Also: Surface weather analysis A surface weather analysis is a type of weather map that depicts positions for . Aviation maps . SEE ALSO REFERENCES |
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