Transcription of SIGNIFICANT WEATHER PROGNOSTIC CHARTS
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SIGNIFICANT WEATHER PROGNOSTIC CHARTS
11-1 SIGNIFICANT WEATHER PROGNOSTIC CHARTSS ignificant WEATHER PROGNOSTIC CHARTS (progs) (Figure 11-1) portray forecasts of selected weatherconditions at specified valid times. Each valid time is the time at which the forecast conditions areexpected to occur. Forecasts are made from a comprehensive set of observed WEATHER conditions. Theobserved conditions are extended forward in time and become forecasts by considering atmospheric andenvironmental processes. Forecasts are made for various periods of time. A 12-hour prog is a forecast ofconditions which has a valid time 12 hours after the observed data base time, thus a 12-hour forecast. A24-hour prog is a 24-hour forecast, and so on. For example, a 12-hour forecast based on 00 Zobservations is valid at 12Z. Altitude information on the prog CHARTS is referenced to mean sea level(MSL) and compatible with aviation.
11-1 SIGNIFICANT WEATHER PROGNOSTIC CHARTS Significant weather prognostic charts (progs) (Figure 11-1) portray forecasts of selected weather conditions at specified valid times.
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