Regional Tornado Risk
Iowa Tornado Season Guide: Corn Belt Storms, Derechos, Tornadoes, and Flooding
A guide to Iowa severe weather, including tornadoes, derechos, hail, flash flooding, warm fronts, and fast-moving storm lines.
Quick answer: Iowa severe weather risk includes tornadoes, derechos, large hail, damaging wind, and heavy rain from Midwest storm systems.
Storm modes
Supercells, squall lines, bow echoes, and mesoscale convective systems can all affect Iowa.
The same day can start with tornado risk and evolve into damaging wind risk.
Derecho risk
Long-lived wind storms can cross large parts of the state and cause widespread power and crop damage.
Severe thunderstorm warnings deserve action.
Flooding
Training storms over farm fields, towns, and rivers can create flood issues.
Road flooding is a major travel hazard.