On March 4, 2009, Nanping City, Fujian Province lasted for a long time with rainy weather.

Last week, due to the heating of the ground and the warm advection in front of the trough, a large warm low pressure was generated in Sichuan Basin and Central China, and Nanping was located at the front of this dry warm low pressure, and the weather was sunny and dry, which was further aggravated by the southwest wind blowing dry before the warm low pressure. However, Nanping has been under the influence of cold air since the cold air east road went south. Because the subtropical high is extremely active in the upper level, the south branch trough is extremely strong, the southwest warm and humid airflow is continuously transported, and the cold and warm air meet to form long-term precipitation. Due to the infiltration of cold air on the ground, the temperature dropped sharply and remained at a low level. The current forecast of this tragedy is that there will be a pause of precipitation in Nanping area until the 8th, but there will be a new round of precipitation around 10.