comes into effect. >> it falls apart but it falls apart much more violently than a typical rainstorm and winds come downright back towards the ground. the winds go every direction and they could be 30, 40, 50 miles an hour, and that's happened several times on this fire. >> you can hear, it's like a train almost. it sounds like something crashing through the forest. >> reporter: it sounds like a train crashing through the forest. i mean, that's terrifying. it just shows you how dangerous and volatile this fire is. they do have about 40% of it contained, thanks to higher humidity and smaller wind gusts but that weather can change and the fire can effectively create its own weather. it's terrifying, alisyn. >> it looks terrifying. all the video looks terrifying and we are thinking of everyone there on the front lines and those who have to evacuate. lucy, thank you very much for bringing us that report. well, no fans in the stands and rising covid cases. how challenging will these games be for the athletes themselves?