FDC Logo Burning Index/Fire Behavior Cross Reference

Home
NWCG Guidance
Standards Checklist
Objective
Guidelines
Create
Approval/Post
Approval Contacts
Approval Information
Publications
Presentations
View Cards

(Deeming et al. 1977)

BI-1978
Potential
Flame
Length (ft)
Fireline Intensity
(BTUs/sec/ft)
Narrative Comments
0-30
0-3
0-55
Most prescribed burns are
conducted in this range.
30-40
3-4
55-110
Generally represent the limit of control for
direct attack methods.
40-60
4-6
110-280
Machine methods usually necessary or indirect
attack should be used.
60-80
6-8
280-520
The prospects for direct control by any means are
poor above this intensity.
80-90
8-9
520-670
The heat load on people within 30 feet of the fire
is dangerous.
90-110+
9+
670-1050+
Above this intensity, spotting, fire whirls, and
crowning should be expected.