Fire Danger Rating System to Change

The National Fire Danger Rating System, implemented in 1972, provides information on fire danger conditions over large areas. This system uses weather and mathematical models to estimate fuel moisture and fire potential, based primarily on the Rothermel Fire Spread Model (1972).

Proposed changes to the model include the following:

  1. Incorporate the Growing Season Index (GSI) to compute live fuel moistures.
  2. Incorporate the Nelson Model to compute fine dead fuel moisture.
  3. Reduce the number of fuel models in the National Fire Danger Rating System.

Experts hope these changes will increase accuracy and simplify decision making. The revised system is anticipated to take effect in 2016.

Find more details here: National Fire Danger Rating System Memo.

See the national map using the current system.