Fog Cloud

Level: 1

Casting Time: 1 action

Range: 120 feet

Duration: Concentration, up to 1 hour

You create a 20-foot-radius sphere of fog centered on a point within range. The sphere spreads around corners, and its area is heavily obscured. It lasts for the duration or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the radius of the fog increases by 20 feet for each slot level above 1st.

Source: PHB, page 243. Available in the SRD.