A cold front moving down from Canada and butting up against moisture out of the Gulf of Mexico has produced freezing rai冷空气前锋从加拿大南下，与墨西哥湾的潮湿气流汇合，形成了冰雹，大雪及山洪从堪萨斯州蔓延至德克萨斯州并向东延伸至密苏里州。