A situation of national danger or disaster in which a government suspends normal constitutional procedures to regain control. It can be an earthquake, flood, landslide, cyclone, tsunami, urban flood, heatwave; a man-made disaster can be nuclear, biological, and chemical, there is no fixed term to declare a national calamity as a 'national disaster. The government is also allowed to stop production and/or stop any citizen from traveling, working, or going to school depending on how serious of danger or disaster the nation is in.
"the government has declared a national state of disaster"
by miss anonymous FMM September 2, 2020