Studies on Seasonal Weather Forecasting (III) - Verification of an experimental seasonal weather forecasting -

Abstract

An experimental seasonal weather forecasting has been made since the fall of 1951. Assuming 20-,25-,35- and 65-day periodicity in the pressure and temperature change,5-day mean chart and 5-day mean temperature were forecasted for the following 80days, and such forecasts were confirmed to be possible. Next, a brief consideration was given for th e mean synoptic pattern and 700 mb or 500 mb chart was found to be preferable for the seasonal weather forecasting. Thirdly,25-day periodic i ty in solar activity was proposed as the probable cause of 25-day periodicity in the meteorological phenomena. And some analyses were made on such a hypothesis.