Thunderfall

Several bolts of lightning hurl from the sky in quick succession. Choose a target you can see within range, as 1d4 +4  lightning bolts are summoned to rain down on the target. Make a ranged spell attack for each bolt. On a critical hit, roll another ranged spell attack for an additional bolt attacking the target (This effect can only happen twice per casting). The target takes 2d6 lightning damage per bolt. 

Using a Higher-Level Spell Slot. Increase the die size for determining how many lightning bolts by 1 stage for each spell slot level above 5th (1d6 at 6th, 1d8 at 7th, 1d10 at 8th, 1d12 at 9th). 

Feel the storm.