perfect storm

1.
globalformaltechnical
- A meteorological event in which several weather systems coincide to produce an unusually severe storm.
2.
USUKglobalneutralinformal
- A rare combination of adverse circumstances or factors that together produce a particularly serious, harmful, or disastrous outcome.
3.
USUKglobalinformalneutral
- A convergence of multiple elements or influences that together create an especially intense or notable result, not necessarily negative.

Examples: