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with lester holt good evening americans feeling the heat tonight in ways and places they maybe never have where they live as high temperature records are expected to fall across much of the country. it is where we begin tonight. 38 million people across 20 states from california to the mississippi river right now living under heat alerts. record highs in the forecast today from cheyenne, wyoming where the forecast high is 99 to dallas/ft. worth airport which could reach 109. between now and wednesday nearly three dozen new record highs could be set the heat wave working its way to the east tonight, leaving the most vulnerable in its path at considerable risk experts are warning it is not summer as usual but rather another global gut check moment from a changing climate just as we face new obstacles in dealing with it. we ll get to that and the forecast from our team standing by in just a moment. let s start with miguel almaguer. reporter: shattering records and thre ....
Central air. it would have me at over 100 degrees inside of the house. reporter: in fresno, california where it will be triple digits all week the fire department is responding to dozens of calls for heat exhaustion how quickly can this weather turn deadly? it could be depending on your age within a half hour. reporter: in scottsdale, a ring camera captured a delivery driver collapsing in the heat record temperatures and historic drought also forcing cash strapped cattle ranchers to sell their herds, which will inevitably drive up beef prices later this year out of grass, out of water, nobody is making any hay reporter: with drought also crippling europe, the uk is poised to be hotter than 99% of the planet, up to 30 degrees above average, forcing the closures of airport runways, crumbling in the summer weather tonight our nation already feeling the heat with the hottest ....