Weather Graphic Products

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

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

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

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

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