According to the National Fire Danger Rating System, extreme fire danger is the highest, most volatile rating.
"Fire Danger Level: Extreme
When the fire danger is “extreme”, fires of all types start quickly and burn intensely. All fires are potentially serious and can spread very quickly with intense burning. Small fires become big fires much faster than at the “very high” level. Spot fires are probable, with long-distance spotting likely. These fires are very difficult to fight and may become very dangerous and often last for several days."
The weather criteria for fire weather watches and red flag warnings usually include the daily vegetation moisture content calculations, expected afternoon high temperature, afternoon minimum relative humidity and daytime wind speed.
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