Call Lightning
A storm cloud appears at a point within range that you can see above yourself. It takes the shape of a Cylinder that is 10 feet tall with a 60-foot radius.
When you cast the spell, choose a point you can see under the cloud. A lightning bolt shoots from the cloud to that point. Each creature within 5 feet of that point makes a Dexterity saving throw, taking 3d10 Lightning damage on a failed save or half as much damage on a successful one.
Until the spell ends, you can take a Magic action to call down lightning in that way again, targeting the same point or a different one. If you're outdoors in a storm when you cast this spell, the spell gives you control over that storm instead of creating a new one. Under such conditions, the spell's damage increases by 1d10.
Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 3.
Call Lightning 5e 2024 vs. 2014 edition differences
The 2024 version states "up to 10 minutes" duration, while the 2014 version states "10 minutes" (no change). The 2024 version specifies "a point within range that you can see above yourself," whereas the 2014 version states "a point you can see within range directly above you"—the latter implies a fixed position directly above. The 2024 version uses "call down lightning in that way again" and "take a Magic action," whereas the 2014 version states "use your action to call down lightning again." Damage scaling remains the same.