last phrase "Kρήτη μου όμορφο νησί'

Γειά σας φίλοι μου,

Χρειάζομαι τη βοήθειά σου!

I've been busy translating a song about my second love Crete, song called "Kρήτη μου όμορφο νησί', and I'm struggling with the last phrase:
Αντάρα πιάνει στα βουνά
τ’ αγρίμια βγαίνουν όξω
κι όταν αστράφτει και βροντά
βγαίνεις, ουράνιο τόξο...

Bear in mind that I'm Dutch so be gentle with me :-)

Hoi vriend haha

Well... this part of the song talks about weather conditions in general... With some idiomatic words!

Storm is breaking at the mountains
the beasts get out
and when it thunders and there are lightnings
you come out, rainbow...

Hope I helped!

Da's een goeie! )

You've been a big help, thank you!