How are hurricanes and tornadoes classified?

Answer:
Hurricanes are rated on the Saffir-Simpson Scale from category 1 (weakest) to category 5 (strongest) based on sustained wind speed.

Tornadoes are rated on the Enhanced Fujita of "EF" scale (formerly the Fujita of "F" scale) from EF0 (weakest) to EF5 (strongest) based on the severity of the damage they cause.
First answer by Stormish. Last edit by Stormish. Contributor trust: 533 [recommend contributor recommended]. Question popularity: 75 [recommend question].