Analysis of the November 2016 Atmospheric Circulation and Weather
The main characteristics of the general atmospheric circulation in November 2016 are as follows. There were two polar vortex centers in the Northern Hemisphere. In the midhigh latitudes of Eurasian areas, there were a high pressure ridge over Ural Mountain and a strong transverse trough over West Siberian. The midhigh latitudes of China were under the control of negative geopotential height anomaly areas, and the zonal circulation was more straight. The northwestern Pacific subtropical high was stronger than normal, located more westward. The south branch trough was located around 90°E averagely. In November, precipitation was characterized by more rainy days and more rainfall amount in the South of the Yangtze River and Southern China. The monthly mean precipitation amount is 30.6 mm, which is 61% more than climatological mean (19 mm). There were four major severe precipitation processes. Extreme continuous precipitation day events occurred over 14 stations, and the daily rainfall amount of 71 stations exceeded the local maximum records in November. Meanwhile, the monthly mean temperature is 2.9℃, which is similar with the climatological mean. There were four main stronger cold air processes, which caused extreme drop in temperature events at 180 stations, among which the readings at 30 stations broke historical extremes. Meanwhile, there were four serious and wide foghaze weather processes. Besides, three typhoons were generated in the Northwest Pacific, South China Sea and Philippines, but their influence on China was little.