Idaho averages 5 tornadoes per year - one of the lowest counts in the country. Mountain terrain and semi-arid climate suppress most tornado formation. Southern Idaho occasionally experiences weak tornadoes.
Rocky Mountains dominate. Terrain suppresses tornado formation.
Dry air limits convection potential.
Higher elevations limit tornado dynamics.
Boise area. Snake River Plain sees occasional events.
Rugged mountain terrain. Very rare tornadoes.
Mountains and forests. Rare tornadoes.