Analysis of the February 2019 Atmospheric Circulation and Weather
The main characteristics of the general atmospheric circulation in February 2019 are as follows. The polar vortex center in the Northern Hemisphere was stronger than normal and located by north in the Eastern Hemisphere. The circulation at middlehigh latitudes of Eurasia showed a fourwave pattern, and the degree of meridionality was lower than normal generally. The Western Pacific subtropical high was strong relatively, and the Bay of Bengal trough was weaker and more to the west than normal. Cold air processes attacked China twice in February, one nationalwide strong cold air process and one moderate cold air process. The monthly mean temperature was -1.3℃, higher than normal by 0.4℃. The temperature was abnormally high in Northeast China. The monthly mean precipitation amount was 23.2 mm, 33.3% higher than normal. Also, one persistent rainy weather event happened in southern China. Snowfall hit the Tibetan Plateau frequently, causing snow disaster in southeastern part of Qinghai Province. In addition, continues foghaze weather appeared in the central and eastern part of China in late February.