Abstract
This chapter highlights the reasons why the prognostic pressure chart should be constructed. If the forecaster cannot visualize clearly what the surface pressure and frontal configurations will look like at a time near the close of his forecast period, he will be completely unable to make consistently accurate forecasts. Further, the better is his ability to visualize these future developments, the greater skill he will show in his weather forecasts. It does not necessarily follow that if a perfect pressure and frontal chart, which is also called a prognostic chart, can be drawn, the weather forecast will also be perfect. Many times it will be less than perfect and it is also possible to miss the forecast entirely and still have a nearly perfect prognostic chart. On the other hand, if a good prognostic chart is not available, particularly in bad weather conditions, an accurate forecast can be made only by great good fortune. It is necessary to construct such chart following appropriate methods so that it can succeed in its goal. The chapter discusses practical methods of constructing such charts using methods not beyond the scope of the average forecast office. It discusses the items to be considered in the construction of such charts.
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