I finally came across a map that I find helpful for understanding the rough boundaries of a current fire in relation to a topographic map which gives me a better sense of what trails have burned or may be in imminent danger of burning than other maps I’m aware of. The map is updated about every two hours as explained here where there are also explanations of the map’s limitations. Viewing the map from the viewer is helpful because one can zoom in. Although more detailed views don’t also display the fire data, zooming back and forth allows considerably closer study than the image I’ve shared below. I’ve added a link to this viewer on my hiking links page for future reference.

Sand Fire Map from the morning of 7-24-2016. Red is active burning. Yellow is last 12 hours. Black is last 24 hours.

To get an image with the topo map and Modis Thermal Satellite Imagery shown above, one needs to select the appropriate data layers in the drop down menu from the viewer. For the above map, I chose Modis Fire Detection from the Dynamic Data menu and US Topographic Map from the Base Data menu.