After gathering information from weather stations across the country for the month of October 1861, he plotted the data on a map using his own system of symbols, thereby creating the world's first weather map. Using the 850 and 700 hPa pressure surfaces, one can determine when and where warm advection (coincident with upward vertical motion) and cold advection (coincident with downward vertical motion) is occurring within the lower portions of the troposphere. On top of that, you get Weather Maps, which is a radar map displaying past and future radar. Also remember that winds flow from high to low areas, so this gives meteorologists a chance to predict local wind patterns as well.  Recent advances in both the fields of meteorology and geographic information systems have made it possible to devise finely tailored products that take us from the traditional weather map into an entirely new realm. Temperatures, fronts, high temps. Temperature is generally recorded in Celsius degrees and rainfall is recorded in millimeters. Physical maps have been around much longer. 1. Many maps use isotherms -- lines connecting points with the same temperature -- to show areas of similar temperature. Northern Hemisphere (data from NWS Ocean Prediction Center) North America (Weather Prediction Center) North America (isobars only - data from the University of Illinois WW2010 Project) Southeast Surface Plot (Data from the University of Illinois WW2010 Project) 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. Snow forecast map for Germany showing snow accumulation over the next 10 days and past 7 days, plus snow reports, live weather conditions and webcams. If these elements for any étage at the time of observation are deemed to be of equal importance, then the type which is predominant in amount is coded by the observer and plotted on the weather map using the appropriate symbol. This enables it to produce velocity data relating to objects present at some distance. Location is the weather station where the current weather is sourced, Current Time shows the time in the city, and Latest Report shows the time the weather report was updated last. Use of constant pressure charts at the 700 and 500 hPa level can indicate tropical cyclone motion.  An area of confluent streamlines shows the location of shearlines within the tropics and subtropics. Detailed maps display wind with symbols that show both wind speed and direction. The pressure pattern will always show you a number of things – we always have areas of high pressure (H) and areas of low pressure (L) and the white lines that circulate around, show where the pressure is equal. Naval Research Lab is powering the feature that shows cloud coverage on the map. SURFACE MAPS w/ ISOBARS and/or FRONTS and/or PLOTTED DATA. Isotachs are drawn at these levels, which a lines of equal wind speed. (The number is in kilopascals (kPa), which is the same as millibars). For instance, icing conditions can be mapped onto the road network. High pressure is usually associated with settled weather while low pressure is normally associated with unsettled weather. In the US, temperatures are in Fahrenheit and rainfall is measured in inches. In the US, The Smithsonian Institution developed its network of observers over much of the central and eastern United States between the 1840s and 1860s once Joseph Henry took the helm. Patterns on the map show areas where rainfall or snowfall is predicted, plus special symbols for thunderstorms, hail, sleet and ice. Maps using isotherms show temperature gradients, which can help locate weather fronts. On generalized maps, the barometric pressure is summarized into a contour map: lines connecting points of equal pressure, called isobars, curve across the map.  The symbol used on the map for each of these étages at a particular observation time is for the genus, species, variety, mutation, or cloud motion that is considered most important according to criteria set out by the World Meteorological Organization (WMO). This is important because masses of air with relatively low or high pressure move across the Earth's surface, changing the weather as they pass.  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. … A surface weather analysis is a type of weather map that depicts positions for high and low-pressure areas, as well as various types of synoptic scale systems such as frontal zones. The station model is primarily used on surface-weather maps, but can also be used to show the weather aloft. A 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. Satellite images allow us to track large storms, while radar informs us … What is a weather map? Kelvin O'Donahue has been writing since 1979, with work published in the "Arizona Geological Society Digest" and "Bulletin of the American Association of Petroleum Geologists," as well as online. Labels on isobars allow readers to observe regional pressure trends and locate zones of high and low pressure. Meteorologists study today's weather and use it to predict what will happen tomorrow. Interactive Weather and Wave Forecast Maps; Numerical Weather Prediction (NWP) Products; Australian Region. 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. It displays a variety of meteorological features in a particular area at a particular moment in time. SW Productions/Brand X Pictures/Getty Images, Brand X Pictures/Brand X Pictures/Getty Images, Hemera Technologies/Photos.com/Getty Images, Hemera Technologies/AbleStock.com/Getty Images, Michael Blann/Digital Vision/Getty Images, National Center for Atmospheric Research: Tips for Forecasting the Weather, Oklahoma Climatological Survey: Weather Fronts, University of Illinois: Wind Direction and Isobars, University of Illinois: Isotherms, Surface Maps. 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 (19 km/h) of wind. Blue "cold front" lines bring rain and wind in the direction the triangular marks point. A line showing a cold front has triangles pointing in the direction the air mass is moving, while warm fronts have half-circles on the side toward which the air is moving. A map legend (or key) lists the features shown on that map, and their corresponding symbols. 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