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Graphical Weather Products

Surface analysis charts provide essential information over large areas, indicating the position of fronts, temperature, dewpoint, and wind at the chart's valid time. Close isobars indicate stronger winds, while dashed lines reflect a weaker pressure gradient. Weather depiction charts, derived from METAR reports, offer a three-hourly overview of weather conditions, marking automated locations. The RADAR summary chart visualizes thunderstorm activity. Understanding key terms like isopleths, isotherms, and isotachs enhances interpretation of various weather conditions for effective forecasting.

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Graphical Weather Products

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  1. Graphical Weather Products Chapter 9, Section D

  2. Surface Analysis Chart • Surface Analysis chart is a good source for general information over a large area. Shows position of fronts, temperature, dewpoint, wind at valid time of the chart • When solid lines, called isobars, are close together the pressure gradient is greater and the winds are stronger • A dashed line indicates a weak pressure gradient

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

  4. RADAR Summary Chart • Only chart which shows lines and cell of thunderstorms • You can determine the tops and bases of the echoes, the intensity of the precipitation and direction of movement • Most effective when used in combination with other charts, reports, and forecasts

  5. Terms • Isopleths - used on precipitable water panel and are lines of equal value • Isohumes - used on average relative humidity panel and are lines of equal relative humidity • Isotherms - are lines of equal temperature • Isotachs - are lines of equal wind velocity on Constant Pressure Analysis Charts

  6. Graphic Forecasts • Low-level Significant Weather Prognostic Chart is valid up to 400 millibars of pressure or about 24,000 feet • Issued four time a day with a 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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