World Weather1

Abstract

THE data recognised as necessary for the forecasting of weather come from a region that is ever widening. Before telegraphic charts were prepared the local observatory had to suffice; but the daily maps now used in predicting the weather of a single country of Europe may cover several thousand miles from west to east. Further, the desirability of warnings of the famines that have devastated semi-tropical and tropical countries has led to thinking in terms of seasons rather than days, and it soon became clear that seasonal variations over much of the earth are related to a surprising extent.