WORST tone ever

[kiddomagic]

okay, wtf is wrong with my tone.
when I go to school, my band period starts at 11:30 something.
when I play, & do my warm ups, I sound SO AIRY. which is sad because I'm first chair in my top band. (we have band before lunch)
but then as soon as I come home, do my warm ups, my tone is good, not airy at all.

what do I do? usually in band, I have a very empty stomach. is this why my tone is like this?

[meghanflute]

i have that same pob. it is usually the climate like the diff room temps and humidity. i sound better at school tho! but yah that is the main prob! hope this helped and try more breath exercises and u can build ur embishure for better sound