Calm before the storm – затишье перед бурей
In the brief calm before the storm, the clerks prepared themselves for the doors to open and bring in thousands of shoppers. (from TheFreeDictionary)
Storm in a teacup – буря в стакане воды
I think it’s all a storm in a teacup — there’s probably no danger to public health at all.
Make heavy weather of something – делать из мухи слона, усложнять
He’s making heavy weather of writing his report — Ingrid finished hers days ago.
A fair-weather friend – ненадежный друг (друг “на хорошую погоду”)
To weather the storm – пережить трудности
Bob lost his job, but somehow his family weathered the storm.
To take something/somebody by the storm – быстро добиться успеха
Today we’re interviewing the 20-year-old fashion designer who has taken Paris by storm.
The Beatles took the US by storm in the early 1960s.