Fog Cloud

Level & School
1st-level conjuration
Casting Time
Action
Range
120 feet
Components
V, S
Duration
Concentration, up to 1 hour
Classes
Druid, Ranger, Sorcerer, Wizard

You create a 20-foot-radius Sphere of fog centered on a point within range. The Sphere is Heavily Obscured. It lasts for the duration or until a strong wind (such as one created by Gust of Wind) disperses it.

Using a Higher-Level Spell Slot. The fog's radius increases by 20 feet for each spell slot level above 1.

Level & School
1st-level conjuration
Casting Time
Action
Range
120 feet
Components
V, S
Duration
Concentration, 1 hour
Classes
Druid, Ranger, Sorcerer, Wizard

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.

Using a Higher-Level Spell Slot. 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.

Fog Cloud 5.5e 2024 vs. 5e 2014 edition differences

The 2014 version states the fog disperses with moderate or greater wind (at least 10 mph), while the 2024 version specifies dispersal by a strong wind, such as from Gust of Wind. The 2014 version explicitly mentions the radius increasing by 20 feet per slot level above 1st; the 2024 version states the radius increases by 20 feet per slot level above 1 without specifying the method.