但NOAA表示，目前的预测技术已较以往大有改进。在2024年的大飓风海伦（Helene）还未成为低气压，只能说是几片云和一场雨之时，NOAA已预测到它将成为大飓风。

WASHINGTON, May 17 (Xinhua) -- At least 21 people were killed as suspected tornadoes swept through parts of the U.S. states of Missouri and Kentucky from Friday into Saturday morning, said authorities ...