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Weather Graphic Products

This guide provides insights into various weather graphic products, including surface analysis charts, radar summaries, and graphical forecasts. It details how surface analysis illustrates fronts, temperature, dewpoint, and wind data, using isobars to indicate pressure gradients. The weather depiction chart offers real-time information from METAR reports every three hours, and the RADAR summary highlights thunderstorms and precipitation dynamics. Additionally, analytical terms like isopleths, isohumes, isotherms, and isotachs are defined, enhancing understanding of meteorological data.

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Weather Graphic Products

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  1. Weather Graphic Products

  2. Surface Analysis Chart • Surface Analysis - Shows fronts, data such as temperature, dewpoint, & wind Solid lines, called isobars, close together, indicate pressure gradient is greater and winds are stronger A dashed line indicates a weaker pressure gradient

  3. Weather Depiction Chart • Information from the METAR reports • An overview of favorable and adverse weather • Prepared every three hours • This bracket symbol ] to the right of a station circle means it is an automated location

  4. RADAR-Summary Chart • Shows lines and cell of thunderstorms • Numbers indicate the height of the tops and bases of the echoes. The intensity of the precipitation and direction of movement is also provided. • Use in combination with other weather charts, reports, and forecasts

  5. Analytical Terms • Isopleths – lines of equal value, used on precipitable water panels • Isohumes – lines of equal humidity, used on average relative humidity panels • Isotherms - lines of equal temperature • Isotachs - lines of equal wind velocity on Constant Pressure Analysis Charts

  6. Graphic Forecasts • Low-level Significant Weather Prognostic Chart, valid up to 400 millibars of pressure, or about 24,000 feet • Issued four time per day, valid time printed on the lower margin of each panel • Shows areas of IFR, MVFR, VFR and moderate or greater turbulence

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