[nomadking]

So are there any other examples of where a national emergency has been declared in this sort of situation?

The UK is affected by natural hazards, such as flooding, heatwaves and wildfires, which can cause significant human, economic, environmental
and infrastructure damage. Emergency planning for natural hazards is
legislated for under the Civil Contingencies Act (2004), which puts the
onus on local emergency responders to plan for civil emergencies.