火か勢せい

noun

force of a fire; strength of flames

Refers to the intensity or power of a fire, often used in news reports about fires spreading or being brought under control.

• 火か勢せいが強つよくて、消しょう防ぼう士しは近ちかづけなかった。

  The force of the fire was so strong that the firefighters couldn't get close.

• 風かぜにあおられて火か勢せいが増ました。

  Fanned by the wind, the flames grew stronger.