By Jackson Pausback and Mihir Khadri
Model Link: Link
This stage represents the initial state of the model. The fire is stationary and it will spread when the start button is clicked.
The second stage is after the fire has been spreading for 14 time steps, this is one time step before the fire will stop burning on the first ignited trees.
And the last picture shows when every tree has been burning for 15+ time steps so the fire has died off and all that is left is a few trees that did not get ignited and a forest of burnt trees.