
Passive
Tailwind
Janna's allies gain Move Speed moving towards her. Janna deals a portion of bonus Move Speed as bonus magic damage on hit and with Zephyr.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
Janna's allies gain Move Speed moving towards her. Janna deals a portion of bonus Move Speed as bonus magic damage on hit and with Zephyr.

Q
By creating a localized change in pressure and temperature, Janna is able to create a small storm that grows in size with time. She can activate the spell again to release the storm. On release this storm will fly towards the direction it was cast in, dealing damage and knocking away any enemies in its path.
Base values from ability rank 1 upward.

W
Janna summons an air elemental that passively increases her Move Speed and enables her to pass through units. She may also activate this ability to deal damage and slow an enemy's Move Speed.
Base values from ability rank 1 upward.

E
Janna conjures a defensive gale that shields an ally champion or turret from incoming damage and increases their Attack Damage.
Base values from ability rank 1 upward.

R
Janna surrounds herself in a magical storm, throwing enemies back. After the storm has settled, soothing winds heal nearby allies while the ability is active.
Base values from ability rank 1 upward.