How is the heat wave formed?

The direct cause of the heat wave is the anticyclone or high pressure ridge in the weather. The anticyclone causes the climate to be dry, which means that all heat waves will cause the temperature to rise without evaporating water.

A heat wave means that the weather continues to be excessively hot and may also be accompanied by high humidity. This term is usually related to the region, so the normal temperature in a warm climate region may be a heat wave in a usually cold region. Some areas are more susceptible to heat waves, such as the Mediterranean climate, which is dry in summer and humid in winter.

Main influence

Under the control of the western Pacific subtropical high, hot and humid weather often occurs in midsummer in the middle and lower reaches of the Yangtze River. 1978 and 1988 are the two most serious large-scale high temperature weather since liberation, which has brought great influence on industrial and agricultural production and people's life. During 1988, controlled by subtropical high, downward flow prevailed in most parts of South China, and heat waves rolled.

High temperature and summer heat force early rice to mature at milk maturity stage, reduce 1000-grain weight and yield; Due to the increase of transpiration and the imbalance of water supply and demand, cotton has wilted and buds have fallen off. High temperature is harmful to the growth of vegetables and other crops. The high temperature and summer heat have greatly increased the water and electricity consumption of urban residents.

Baidu Encyclopedia-Heat Wave