"severe fire" is correct and usable in written English.
You could use it when referring to a large, destructive or intense fire. For example: "The severe fire destroyed nearly half of the city."
Results also suggest that fuel reduction management prescriptions may marginally minimize wildfire severity during a severe fire season, when scheduled in a spatial pattern.
Fuel reduction treatments simultaneously reduced fire severity and enhanced short-term metrics of ecosystem resiliency to uncharacteristically severe fire.
The South is in one of the most severe fire seasons in recorded history.
Severe fire danger warnings are in place for Sydney and the Illawarra.
Rising temperatures will result in a "greater number of days with severe fire danger".
When a severe fire threatened in 1996, the village was evacuated for three days.
A Cornwall seafront hotel was destroyed today by a severe fire.
Pine forests often suffer severe fire damage, being very combustible because of their high resin content.
The Victorian Country Fire Service has also issued severe fire danger warnings for parts of northwest rural Victoria on Tuesday.
No one was injured in the blast, but the bomb caused severe fire damage to the front of the hotel.
