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BFB - What it does (outputs)

Using the analysis start date, WFDSS retrieves the previous days (number determined by FBS on General Information page) of RAWS data, as well as National Weather Service (NWS) Forecast Data to complete fuel moisture conditioning (of dead fuels) for each cell of the landscape extent. WFDSS Basic Fire Behavior (BFB) uses the dead fuel moistures calculated by the analysis start date and time and the forecasted wind information to provide fire behavior outputs for one instant in time for the entire landscape extent. BFB provides many of the same fire behavior outputs as BEHAVE (and BehavePlus). Below are the outputs currently available in WFDSS BFB and their units:    


Display Units

Flame Length

meters or feet

Rate of Spread

meters per meter (m/min) or chains per hour (ch/hr) or miles per hour (mi/hr)

Fireline Intensity

kilowatts per minute (kw/m) or BTUs per foot-second (BTU/ft-sec)

Heat per Unit Area

kilojoules per meter squared (kJ/m2 )

Crown Fire Activity

No Fire, Surface Fire, Passive Crown, Active Crown

Maximum Spread Direction



Wind Direction


Wind Speed

miles per hour (mi/hr)

Hauling Chart

meters or feet


WFDSS Automated BFB also calculates the following environmental outputs:


Display Units

1 hour fuel moisture

percentage (e.g., 0.06 = 6%)

10 hour fuel moisture

percentage (e.g., 0.18 = 18%)

Solar radiation

watts per meter squared (W/m2 )

Because it is geospatial, WFDSS BFB calculates and maps the outputs for every cell on a landscape for an instant in time. In WFDSS BFB, the user can change the units for some outputs and ACCEPT/REJECT the outputs.

The ACCEPT / REJECT button is located at VIEW RESULTS / RESULTS for each analysis.

Last updated on 12/30/2021 3:49:07 PM.

In This Section

WFDSS Basic Fire Behavior (BFB)

See Also

BFB - What it is

BFB - What it needs (inputs)

BFB - What it means (interpretation)

BFB Assumptions and Limitations

BFB - Why use it - (potential uses)


Field Descriptions

Glossary Resources

Spatial Data Reference

Landscape Data Source Reference

Relative Risk Reference

Organization Assessment Reference

Fire Behavior Reference

About the WFDSS Decision Editors