Cause of September Typhoons in Hong Kong

Abstract

AN investigation of the average distribution of atmospheric pressure in South-Eastern China and neighbouring regions has proved the existence of a trough of relatively low pressure in the channel between Formosa and Luzon, and in the northern part of the China Sea during September. This appears to be the reason why typhoons so frequently enter the China Sea during that month of the year, and cause north-east veering to south-east gales to be felt in Hong Kong. Like storms that visit the British Isles, they move along between two areas with higher pressures, and are sometimes developed under the influence of those areas. This remark would be of considerable value in forecasting typhoons in Hong Kong if the district round the China Sea were better furnished with telegraphic reporting stations than it is at the present time.