FBP Go: Crown Fraction Burned difference

[brettedw]

Describe the task

I have noticed a difference in the crown fraction burned calculation between FBP Go and the Red Book and Red App. Here’s an example using an FFMC of 95, a wind speed of 10, and BUI of 150. I had thought there would be some differences due to rounding between the red book and FBP Go, but that Red app and FBP Go would be the same. Red App is at 88%, similar to the Red Book, while FBP Go is 94% CFB. I have a scenario in the S-390 where I ask them to estimate the time of day the fire may go from surface to intermittent crown, then to a continuous crown fire. Currently, Red App and the red book show no continuous crown fire, while FBP Go shows continuous crown fire during the peak of the burning period. They are all quite close, so not a big deal, but I tested it with M4 30% and there is a 2% difference between FBP Go and Redapp. I don’t think it’s a priority, but I’m curious why there is a difference.

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[brettedw]