blow up a storm
To play an instrument that requires blowing (such as the trumpet or saxophone) with great skill.
I love this jazz club. Did you hear that guy blowing up a storm? What a talent!
lull before the storm
A period of inactivity or tranquility before something chaotic begins. Likened to a literal period of
the calm before the storm begins.
This is the lull before the storm—the dinner rush will turn this place into a mad house.
a storm in a teacup
(also a tempest in a teapot) a small or unimportant problem that is treated as much more serious than it really is:
Don’t worry. It’s a storm in a teacup. Everyone will have forgotten about it by tomorrow.