During the Crimean War a storm devastated the French fleet at Balaklava, and the French scientist Urbain Le Verrier was able to show that if a chronological map of the storm had been issued, the path it would take could have been predicted and avoided by the fleet. The use of weather charts in a modern sense began in the middle portion of the 19th century in order to devise a theory on storm systems. Sir Francis Galton, the inventor of the weather map Cloud codes are translated into symbols and plotted on these maps along with other meteorological data that are included in synoptic reports sent by professionally trained observers. A popular type of surface weather map is the surface weather analysis, which plots isobars to depict areas of high pressure and low pressure. Two-dimensional streamlines based on wind speeds at various levels show areas of convergence and divergence in the wind field, which are helpful in determining the location of features within the wind pattern. Use of constant pressure charts at the 700 and 500 hPa level can indicate tropical cyclone motion. Isotach maps, analyzing lines of equal wind speed, on a constant pressure surface of 300 or 250 hPa show where the jet stream is located. Maps using isotherms show temperature gradients, which can help locate weather fronts. Such maps have been in use since the mid-19th century and are used for research and weather forecasting purposes. A surface weather analysis for the United States on October 21, 2006.Ī weather map, also known as synoptic weather chart, displays various meteorological features across a particular area at a particular point in time and has various symbols which all have specific meanings.
0 kommentar(er)
