Flood warnings/storm warnings where I live today:
When it rains it pours!
It is an ill wind that blows nobody well.
A rising tide raises all boats.
It's time to bring your ship into the shore.
Any port in a storm.
Don't be a fair-weather friend. (mine are definitely not!!)
Its raining cats and dogs.
Come hell or high water.
A friend is more precious than rubies.
Gimmee shelter.