force of nature

Short definition from Wiktionary

Noun

1. 1
   A mighty natural force which is beyond human control, notably if potentially catastrophic, such as the elements (e.g. storms and extreme temperatures) or geological (e.g. seismic and volcanic) activity.
2. 2
   A thing or person that exhibits qualities which appear to be beyond outside control.
3. 3
   A fundamental force.