Fog Cloud

1st-Level Conjuration Spell (Druid, Ranger, Sorcerer, Wizard)

Casting Time: Action
Range: 120 feet
Components: V, S
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: Player's Handbook, p. 243