A large cumulonimbus cloud forms covering a 20- foot-radius, 40-foot-high cylinder centered on a point you can see within range. The cloud creates an area of dim light directly beneath it and lightning lances down along with rain and heavy wind. Each creature in the cylinder must make a Dexterity saving throw. A creature takes 2d8 thunder damage and 4d6 lightning damage on a failed save, or half as much damage on a successful one.
High winds and rain turn the storm's area of effect into difficult terrain until the end of your next turn. Strong winds of 50 mph or more can disperse the cloud
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the thunder damage increases by 1d8 and the lightning damage increases by 1d6 for each slot level above 4th.
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