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# Unit 11: Fire Behavior Prediction Systems

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Systems Pt. 1   ::   Worksheet & Field Guide   ::   Practice   ::  Systems Pt. 2  ::   Estimating   ::   Exercises

## Effective Windspeed

Effective Windspeed : The midflame windspeed adjusted for the effect of slope on uphill fire spread.

## Slope Considerations in Fire Behavior Calculations

Calculation procedures based on midflame windspeed and slope.

 Wind upslope, spread upslope – use the midflame windspeed and maximum slope value. Wind downslope, spread upslope – use the maximum slope value with zero windspeed. Wind upslope, spread downslope – use zero slope and zero windspeed. Wind downslope, spread downslope – use midflame windspeed and zero slope.

The procedures for using the fire behavior prediction model go on and on. If you're a Plans Chief on a large fire, you will want to know what to expect of fire behavior on all portions of the fire perimeter. This requires line source fire predictions. How far might firebrands travel to cause spot fires? What will be the maximum scorch height in a stand of timber? What is the potential for a free burning, continuous fire front?

These questions and many others are covered by procedures taught in advanced fire behavior courses. If you have special needs or interest in the fire behavior predictions area, note the publications listed in the reference bibliography in the student guide. You might also contact a qualified Fire Behavior Officer in your area for help.