中雪大雪，即将抵达长沙县！

Group 1 - The Hunan Meteorological Observatory has issued an orange cold wave warning, predicting a temperature drop of over 12°C in most areas of Hunan from 8 AM today until 8 AM on the 21st, with minimum temperatures expected to fall below 0°C in many regions [1][3] - A yellow warning for low temperature, rain, and snow has also been issued, forecasting freezing rain, sleet, or snow in parts of Hunan from 8 AM on the 19th to 8 AM on the 20th, with minimum temperatures below 0°C [3] - The provincial meteorological bureau has activated a level three emergency response for low temperature, rain, and snow, with relevant units entering a state of emergency response [3] Group 2 - The latest weather forecast for Changsha indicates a transition from light rain to freezing rain on the 19th, with temperatures ranging from -1°C to 3°C, and a forecast of snow on the following days [5][6] - Specific weather conditions include freezing rain turning to snow on the 20th, with temperatures dropping to -3°C to -1°C, and continued snow on the 21st [5][7] - The forecast also includes a clear day on the 23rd, with temperatures ranging from -3°C to 6°C [5][7] Group 3 - The public is advised to take precautions against the cold wave, including wearing warm clothing and securing outdoor items that may be affected by strong winds [9] - Recommendations include avoiding outdoor activities during severe weather and ensuring safety measures are in place for vulnerable populations [9][12] - The impact of cold waves includes potential damage to agriculture, transportation disruptions, and health risks due to extreme temperature drops [12][21]