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Outdoor concert in vegas yesterday. more than 30 people had to go to the hospital. alexandria steele is live for us in the cnn weather center. it is hot and only getting hotter. >> you mentioned death valley. if death valley hits 130, two degrees shy of our forecast, it will be the first time in 100 year, so we are in some rare air here. essentially, it's an atmospheric blast furnace. it's that high pressure ridge that's kind of acting like a dome, kind of trapping this heat in it. high pressure means sinking air, which means compressing air and thus, warming air and pretty rapidly. the proble...

Morning. 105 degrees in phoenix. their average for the high, which is hours from now, is 107, so they're used to being in the 100s on average. today, 118 degrees expected. only 2 degrees shy of 120. only hit 120 three times ever since records have been kept. to las vegas we go. right now, already 103. that's their high for the day this time of year. 117 potentially. sunday, that would be the warmest they have ever been. so, fredricka, we're not just talking about high for a day or high for a month. we're talking about rarefied air, places and temperatures these places haven't seen. >> that's i...

Normal summer day. it's pretty much too hot for anyone to be outside that doesn't have to. >> thank you very much for your reporting. there's no doubt it's dangerously hot out west. it's not your average heat wave. we have some perspective on what's happening in our western states and why. >> don, we're talking about record heat. not just the record for day or a month but some of these places in the desert southwest will get to temperatures that they have never been to before. if so maybe once or twice in the history of recordkeeping. here is why. this jet stream extreme is this dome of high p...

California's death valley today, and people are doing whatever they can to try to stay cool. alexandra steele is live for us in the cnn weather center. this is some oppressive heat, particularly dangerous, alexandra, for the most vulnerable of our population. >> you know, but with numbers as high as these are, it's not only that. i mean, we're talking about records that aren't just highs for the day or highs for the month, but some of these places in the desert southwest could see temperatures that they have never seen before. here is why. it is a jet stream extreme. so here is what's happenin...

They can come streaking through the earth earth's atmosphere. we're not tracking them like aster 'roids. -- asteroids. this one just happened to be on the large size. jon: what happens when it blows up? it is a rock. it comes streaking through the atmosphere at thousands of miles-an-hour. the friction when it encounters the earth's atmosphere that makes it hot. what causes the explosion? >> when it comes into the earth's atmosphere traveling over 30,000 miles-an-hour first thing that is happening compressing air ahead of it. so it heats the air ahead of it andmation the sky glow around it to m...