关键词: 干热风, 环流特征, 低层干暖区, 数值产品应用

Abstract: Based on the daily highest temperature,the relative humidity at 14∶00 and wind speed during 1st to 20th in June from 1977 to 2006 from 5 observation stations in Changzhi city,the circulation situation in height of 500hPa,the configuration of temperature and humidity in height of 850hPa and the characteristic of ground pressure field of the 30 dry-hot winds were analyzed.The results showed that the 500hPa circumfluence situation,which resulted in dry-hot wind weather process,included four weather models: two groove-one ridge,northwest airflow,one groove-one ridge,and East Asian large groove.Hetao region was controlled by the huge warm-lower system in the ground pressure field.850hPa weather map,the dry warm area were in the range of 105 °E to 117°E and 32°N to 40°N,and its intensity affected dry-hot wind intensity.The dry-hot wind weather process in June 1-3,2009 was predicated successfully by using the numerical forecast products of Europe center and China's T213,T639 and the landmark weather model method and 850hPa dry warm area index.

Key words: Dry-hot wind, Dry-hot wind, Circulation characteristic, Low layer dry warm region, Numerical product application