Alaska averages essentially zero tornadoes per year. The state's arctic and subarctic climate, dominant terrain features, and lack of warm continental air masses eliminate tornado formation potential. Along with Hawaii, Alaska is the rarest US state for tornadoes.
Cold temperatures prevent warm moist air convergence.
Mountain ranges, glaciers, and diverse terrain don't support supercell formation.
Far northern latitude far from continental air masses.
Cold air dominates; warm moist air never reaches interior regions in significant amounts.