UPDATED: 8/19/26
FEMS 3.7.1 Hot Fix Release Notice
- A hot fix was deployed August 11, 2026, to address several issues, including the snow flag gap-fill process, precipitation gap-fill issues, NFDRS Download fuel model limitations, and security vulnerability fixes.
Understanding the Basics of NFDRSv4
- An entry-level overview of the science behind the National Fire Danger Rating System. This document outlines the scientific foundations used to develop NFDRS, references supporting sources, and describes the inputs required to calculate fire danger and how the resulting outputs represent modeled conditions. It is designed specifically to help FEMS users understand the data involved and how it relates to system functions. 22 pages.
Default FEMS FireFamilyPlus Database v2
- A top trending resource
On the National Fire Danger Rating System page in the FEMS Data Sets Information accordion, a link to the abstract for the paper describing the foundation of the dead fuel moisture model in NFDRSv4 has been changed to a link to the published paper (Nelson, 2000).
Transition Materials from WIMS to FEMS
- Everything you need to navigate the transition