perfect storm
US /ˈpɜr.fɪkt stɔrm/
UK /ˈpɜr.fɪkt stɔrm/

1.
a situation where a combination of negative circumstances will severely worsen a crisis
:
•
The economic downturn, coupled with rising unemployment, created a perfect storm for many families.
•
The company faced a perfect storm of declining sales, increased competition, and a major product recall.