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>> will carr joins us now from palm desert, california. this is the third heat wave in a row gripping much of the west. how rare is it to see such high temperatures this early and this often in the season? >> reporter: whit, it is rare, and it is hot here. this is the third heat wave we've had in a short amount of time. at this point last year, we only had one heat wave with temperatures that reached these levels. firefighters tell me they're not only worried about the temperatures this weekending but the impact on fire season moving forward because we have a long way to go. >> those firefighters will have their hands full. will carr, thank you. let's get right to abc's senior meteorologist rob marciano. rob, this heat is truly historic. >> reporter: it is. each one of these heat waves has been threatening or breaking all-time high temperature records. vegas could do just that. it's expansive, too. across ten states we have heat alerts up. this heat wave is encompassing a lot of people. 113 tomorrow as far north as redding, california. 103 in salt lake. 117 is the all-time record for