"Extreme" fire danger means any spark could start a blaze Western Montana fire danger soars from "high" to "extreme" in just a week By: Dennis Bragg and last updated 2021-07-13 22:32:53-04 MISSOULA â With fire danger soaring from "high" to "extreme" in just a week, fire managers are warning Western Montana residents any spark could start a big blaze right now. The fire danger levels are based on a variety of factors, such as weather conditions and especially the measurement of moisture content in fuels like grass, brush, and timber. And when we go to "extreme" that's the worst case scenario.