暴雨大暴雨，要来了！

Core Points - A strong cold air mass is currently affecting most parts of China, leading to significant temperature drops and increased precipitation [10][11] - The most intense rainfall is expected from the night of October 16 to October 17, particularly in the Huaxi to Huanghuai regions [3][5] - The cold air will also bring snowfall to areas such as the northeastern Inner Mongolia and the western Sichuan Plateau [3][7] Summary by Sections - Cold Air Impact: The cold air mass is expected to lower average temperatures by 4 to 8 degrees Celsius across most regions, with some areas experiencing drops exceeding 10 degrees Celsius [10][11] - Rainfall Forecast: Rainfall will intensify in the Huaxi to Huanghuai regions, with heavy rain and potential for localized severe weather events such as flash floods and landslides [9][3] - Temperature Records: Following the cold front, many areas will see their lowest temperatures in the past six months, with northern regions experiencing maximum temperatures below 10 degrees Celsius [11][10] - Weather Warnings: Residents are advised to prepare for significant temperature changes and potential health risks associated with the cold weather [11][10]