Recent studies have documented possible ongoing changes to the climatology of tornadoes in the United States. Observed changes include increasing tornado counts in the Southeast and Midwest Regions, decreasing tornado counts in the Great Plains, and increased clustering of tornadoes on fewer days of the year. This study illustrates that the spatial dispersion of tornadoes in the United States is also changing. The dispersion of tornadoes decreased between 1954 and 2017, most notably in spring, summer, and fall. Furthermore, tornadoes tended to be less spatially dispersed in seasons with more tornadoes and with multiple days on which 20 or more tornadoes occur. This suggests that the increased occurrence of tornado outbreaks is contributing to the decrease in dispersion.

最近的研究表明，美国龙卷风的气候可能会不断发生变化。观察到的变化包括东南部和中西部地区的龙卷风数量增加，大平原上的龙卷风数量减少以及一年中更少的日子中龙卷风的聚类增加。这项研究表明，美国龙卷风在空间上的分布也在发生变化。在1954年至2017年期间，龙卷风的散布性有所下降，最显着的是春季，夏季和秋季。此外，龙卷风在具有更多龙卷风的季节以及发生多于20天或更多天的龙卷风的季节中，在空间上的分布往往较少。这表明龙卷风暴发的发生增加导致了散布的减少。