Abstract
THE possibility of seasonal forecasts in India was first investigated by H. F. Blanford about 1876, using only the snowfall in the Himalayas. As the research proceeded, it was found necessary to consider conditions farther and farther away, until in the hands of Sir Gilbert Walker it developed into an investigation of the inter-relationships of weather in all parts of the world. A chart of the average barometric pressure over the globe shows a number of more or less permanent areas of high and low pressure; for example, the Azores high and the Icelandic low. In these areas the variability of pressure reaches a maximum, and they are accordingly termed “centres of action”; the pressure changes of intervening places, such as the British Isles, are dominated by those at the centres of action.
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World Meteorology and Long-range Forecasting1. Nature 116, 413–414 (1925). https://doi.org/10.1038/116413b0
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DOI: https://doi.org/10.1038/116413b0