What do the yellow triangles represent?

[OHFW Bill]

I am using this tool to help deal with wildfires in our area. We are quite dry in north central Washington State, US during the summer and next to human activity lightning strikes are the most common causes of fire starts.

When I zoom deeply into the map I see a number of yellowish triangles. I can not find any information that states what they mean, could someone please let me know.

Thank you.

Bill
Okanogan Highlands Fire Watch FaceBook Group