fire starting at the cab of the tractor trailer. it spread almost halfway down the truck. if you pull up you can see how big this is together 500 plus acres. there are mandatory evacuations in place. that's worth mentioning as well. >> again, i say that was el cajon, california. actually, the cajon pass. that's where the images you see on your screen are coming from. look at the black smoke coming out of that tractor trailer. chris hayes has been reporting on the drought in california all week. we just cut in 15 minutes ago. looking at this incredible scene south of where you are right now. just your reaction looking at this? >> you can actually see the plumes of smoke emanating up over the santa monica mountains which are right behind me here