Guess me: I am eight letters long '12345678', My 1234 is an atmospheric condition. My 34567 supports a plant....

Question

I am eight letters long '12345678'
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is to appropriate.
My 45 is a friendly thank-you.
My 678 is a man’s name.

What word am I?

Answer 1

May be MISTAKEN