 In the United States the subtropical ridge Bermuda High helps create the hot, sultry summers with daily thunderstorms with buoyant airmasses typical of the Gulf of Mexico and East Coast of the United States.This flow pattern also occurs on the eastern coasts of continents in other subtropical climates such as South China, southern Japan, central-eastern South America Pampas, southern Queensland and KwaZulu Natal province in South Africa.When surface winds become light, the subsidence produced directly under the subtropical ridge can lead to a buildup of particulates in urban areas under the ridge, leading to widespread haze.