Tornado

Create a tornado in a 30ft by 30ft area of affect. Any creature who starts thier tornado must succeed on a dc 13 dexterity saving throw, or take 2d4 thunder damage and is knocked prone, and half as much on a failed save without becoming prone.

The tornado is stationary. If a creature moves while in the torando its speed are reduced by 10ft. A vehicles speed is reduced to 3/4 speed.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d4 for each slot level above 3rd.