EF1 tornado in Cass County, Iowa

Brief tornado which destroyed an old barn but otherwise remained in rural cropland.

Thunderstorms moved northeast into Iowa overnight. While overall instability was around 500 J/KG, the 0-3km MLCAPE was over 125 J/KG across southwest Iowa accounting for around a third of the overall updraft strength. Effective helicity values were nearly 500 m2/s2. The strongly sheared environment along with decent near surface instability led to the development of two tornadoes across southwest Iowa during the night. The first tornado was an EF-1 and virtually destroyed an old farm building southeast of Anita. The second more powerful tornado occurred southeast of Adair and impacted a few different farmsteads. The final farmstead encountered received EF-2 damage producing 1 injury and 1 fatality. The tornado crossed Interstate 80 and then remained in rural cropland for the remainder of the path.