Indian summer as a characteristic weather type of the eastern United States

The author's studies of the weather maps which characterize Indian Summer weather have led him to recognize a type of pressure distribution which uniformly gives several days of weather commonly called Indian Summer. This pressure distribution was described as a more or less stagnant area of high pressure over the southeastern States and a weak cyclonic area passing slowly down the Saint Lawrence Valley. The resulting winds are light, and the moderate chill of the early morning and evening resulting from a fairly well marked diurnal range of temperature is swept away by the genial warmth of the light southerly winds, and by the strong isolation of the daytime.