After transitioning into a post-tropical cyclone, Katia moved quickly across the North Atlantic and toward Europe, prompting the Met Office to begin warnings citizens for potential impacts over subsequent days on September 9.
轉化為後溫帶氣旋後，卡蒂婭迅速橫過北大西洋，向歐洲方向移動，促使英國氣象局開始警告市民在9月9日後數天風暴的潛在影響。