to be under the weather
not feeling well
to get wind of
to receive information about sth indirectly
calm before the storm
a period of peace before a crisis
to have one's head in the clouds
not paying attention or daydreaming; to have unrealistic ideas
it's raining cats and dogs
It's raining heavily
save it for a rainy day
keep something i.e. money for a time when it is needed
a snowball's chance in hell
little or no chance to succeed
steal someone's thunder
take the attention away from someone, usually to your own advantage
to make a storm in a teacup
a lot of fuss over something small (Don't worry about those two arguing. it's just a storm in a teacup.)
every cloud has a silver lining.
Be optimistic, even difficult times will lead to better days.
a fair-weather friend
a person who is only a friend in good times
break the ice
to make a start by overcoming initial difficulties