强对流天气预警：北京内蒙古河北等地部分地区有10级以上雷暴大风

Group 1 - The Central Meteorological Observatory issued a blue warning for severe convective weather, predicting strong thunderstorms and hail in various regions from September 13 to September 14 [1] - Areas expected to experience wind speeds exceeding level 10 include central Inner Mongolia, northern Hebei, and northwestern Beijing, with significant rainfall forecasted in parts of southern Hubei, northwestern Hunan, southeastern Chongqing, and northeastern Guizhou [1] - The main impact period for severe convective weather is anticipated to be from the afternoon to the night of September 13 [1] Group 2 - Government and relevant departments are advised to prepare for short-term heavy rain, thunderstorms, and strong winds, with meteorological departments readying for artificial hail prevention [4] - Outdoor activities should be minimized, and individuals are advised to stay away from temporary structures and billboards [4] - Precautions include securing livestock in covered areas, checking drainage systems, and preparing for potential disasters such as mountain floods and landslides [4]