What does the weather forecast always mean by what level the fire signal or ignition signal is?

Fire risk forecast is generally divided into five grades: 1 grade, with low or no fire risk grade, which is not easy to cause fire; Level 2, which is a low fire risk level or a weak fire risk level, is generally difficult to cause a fire; Level 3, a medium fire risk level, can cause a fire, but it is generally not easy to spread and it is easier to put out; Grade 4, high fire risk level, easy to catch fire and conducive to the spread of fire, not easy to put out; Level 5, the highest fire risk level or extra-large fire risk level, which is prone to fire, easy to spread and difficult to put out.