Your Hunter uses Summon Flight of Eagles to get 11,000 feet above your enemy. You'll be level 13 before you can cast Call Lightning Storm, so it will have an effective range of only 900 feet so you got quite a dive to get within range, so spend an action casting Horn of Pursuit on your way down to announce yourself with a Stuka siren. Don't worry HoP has a two mile range so they'll hear ya.
Oh and when you come back in ten hours you'll want to let them know what's coming.