While browsing for historical fire maps, I ran across this interesting study of Yosemite wildfire issues. I scanned some of the study and felt it would be useful information.
I didn’t know that there are fewer individual and less severe wildfires in the early season, due to snowpack’s effect on thunderstorm development. The Forest Service land, where I took this 1990 picture of the A-Rock Fire, has burned 13 times in the last 100 years. Why did this particular wildfire kill so much old growth, when previous uncontrolled fires did not?
You can also see the fire’s “twin”, across the canyon. It also has suffered a re-burn, although it was the Park Service who let a fire get out of hand, on that incident too. The A-Rock re-burned when a prescribed fire was lit, and lost, within an hour of ignition. The Meadow Fire burned for weeks, costing $17 million, closing the Park during the height of tourist season. The Forest Service portion of the A-Rock Fire hasn’t re-burned, yet.