Abstract
This volume is concerned with prediction for periods of medium duration from one to three days. It presents those suggestions on forecasting appearing in the synoptic literature, those computations outlined in the theoretical papers, and those current ideas that in the authors’ opinion are useful or worth trying out.
The introduction takes up the methodology of forecasting. Following a description of the various routes chosen by different writers to make predictions, it is concluded that the prognostic-chart method is the most valid technique at this time; further, that for forecasts in excess of 24 hr, it is logical to make the upper-air prognosis at first and then translate it into a surface forecast with some computations and with the aid of rules and models. The minimum data and chart material requisite for the routine are listed.
Chapter II gives the tools for the upper-air prognosis, beginning with the broadest scale features and then narrowing the considerations by steps to the details of forecast districts. An initial section on the “index cycle” takes up the evolution of hemispheric weather patterns. Then the long-wave calculations determine the principal features of the variation of flow pattern with longitude. Such rudimentary methods as are now available to predict blocks and closed centers within the westerlies further establish the prognostic field of flow. A discussion of the prediction of the very important velocity concentrations and slow areas within the upper current follows, also a section on the placing of the short waves aloft which are superimposed on the long waves. The chapter closes with a suggested routine for preparation of the upper-air prognostic chart.
Chapter III treats the surface prognosis, beginning with the central subject of forecasting—the formation and deepening of cyclones. It is shown that most forecasting methods offered to date on this problem largely express instantaneous correlations so that their value for prediction is limited to very short time intervals. The conclusion is drawn that the prediction of cyclone formation two days ahead is best done by means of evaluation of the vorticity field of the upper-air prognosis. Next the chapter takes up the movement of highs and lows, based mainly on the steering principle, and it develops a routine for the construction of surface prognostic charts including some dynamical consistency checks between upper-air and surface prognosis. An extensive discussion of the preparation of temperature and rainfall prediction—usually treated very briefly in texts on forecasting—terminates the chapter.
In chapter IV, we go through the steps of the prognosis of a field example. The prognostic chart shown is essentially a copy of the prognosis made at the time.
Finally, the calculations that form the basis of chapters II and III are described in ten appendices.
A technical report prepared at the University of Chicago under contracts with the U. S. Weather Bureau and the Office of Naval Research.
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Riehl, H. et al. (1952). Forecasting in Middle Latitudes. In: Forecasting in Middle Latitudes. Meteorological Monographs, vol 1. American Meteorological Society, Boston, MA. https://doi.org/10.1007/978-1-940033-05-1_1
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