On the Forecasting of Long Waves in the Upper Westerlies

This study of the interrelations and interactions in the long waves in the upper westerlies on daily charts has disclosed several results having prognostic significance. The relation of the movement of the long waves to the wave length and the speed of the zonal westerlies is discussed. The basic current of westerlies is studied and some indications for its variations are shown. Some interactions between the long waves, which have prognostic value, are those involving change of wave number, change of wave length, and change of amplitude. A Study of these interactions leads one to conclude that daily upper-air charts showing several of the long waves are a prerequisite for the forecasting of the long-wave pattern.