An Overview of Weather Maps

cobaki April 7, 2015 Comments Off on An Overview of Weather Maps

What are weather maps? Weather maps display different meteorological characteristics across certain areas at certain points in time and have several symbols that all have particular meanings. These maps are used by researchers and are helpful for various researches and climate forecasting purposes. Weather maps use isotherms that show gradients, temperatures that are helpful to locate weather fronts. Isotach maps, analysis of equal wind speed lines, with a pressure surface of around 250 MB or 300 MB. It indicates where the jet streams are located. Using constant pressure reports at 500 hPa and 700hPa level can show tropical cyclone movements. Streamlines of two dimensions are based on airstream speeds at different levels indicate places of divergence and convergence of the wind stream that is helpful in calculating the locations of characteristics inside the wind pattern. A well-known kind of surface climate map is surface weather analysis that draws isobars to predict the places of low pressure and high pressure. Certain weather maps in aviation indicate places of turbulence and icing for others. Types of weather maps


Aviation maps – aviation has a certain group of weather maps. One kind of map indicates where visual flight rules (VFR) are effective and where instrument flight rules (IFR) are effective. Weather representation plots indicate ceiling height to hundreds of feet, cloud cover and present weather. Icing maps locate areas where snowfall would be dangerous for flying. Aviation associated maps also locate places of turbulence.

Constant pressure analysis – Constant pressure analysis generally consists of specific temperature values, wind, vertical height and humidity above water level of pressure surface. They can be used for a number of purposes. In mountainous terrains of Mexican Plateau and Western United States, the pressure surface of 850 hPa is more realistic indication of weather patterns than that of normal surface analysis. Using 700 and 850 hPa pressure surfaces, people can determine where and when warm advection (immediate upward vertical movement) and cold advections (immediate downward vertical movement) occur within lower parts of the troposphere. Places with minor rain depressions and below freezing depict the existence of icing situations for aircraft. Shallow tropical cyclones that contain experienced vertical wind shears, are tended to steer by airstreams at 700 hPa level.

Surface weather analysis Surface weather reports are a kind of weather maps that indicate positions for low and high pressure places along with different kinds of synoptic scaling systems like frontal zones. Isotherms can be plotted on those maps that have lines of same temperature. Isotherms are plotted generally in the form of solid lines at the preferred temperature intervals. They indicate temperature gradients that are useful to find out fronts, present of the warmer side of big temperature gradients. By drawing the freezing lines, isotherms are helpful to determine precipitation kind. Mesoscal boundaries like tropical cyclones, squall lines and outflow boundaries are also examined in surface weather analyses.


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