Fire Danger Rating

Fire Danger Ratings are scientifically derived using data from our Remote Access Weather Stations (RAWS). By measuring things like temperature, humidity, wind speed and fuel moisture and comparing them to historical fire occurrence, fire managers are able to set thresholds or triggers that signal the potential for larger and more intense fires. The National Fire Danger Rating System (NFDRS) automatically produces the Fire Danger Rating daily based on these trigger thresholds and daily readings from the RAWS, then categorizes them accordingly for use by the public as follows:

Low (L) - Fuels do not ignite readily from small firebrands although a more intense heat source, such as lightning, may start fires in rotted wood. Fires are likely to remain small and their control is easy.

Moderate (M) - Fires can start from most accidental causes, but with the exception of lightning fires in some areas, the number of starts is generally low. Fires are not likely to become serious and their control is relatively easy.

High (H) - All cured grasses ignite readily and fires start easily from most causes. Unattended brush and campfires are likely to escape. Fires may become serious and their control difficult unless they are attacked successfully while small.

Very High (VH) - Fires start easily from all causes and, immediately after ignition, spread rapidly and increase quickly in intensity. Extreme fire behavior is possible. Fires will be very difficult to control.

Extreme (E) - Fires start quickly, spread furiously, and burn intensely. All fires are potentially serious. Extreme fire behavior is likely. Fires will be unlikely to be controlled unless attacked immediately and aggressively.