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new system moving in. all this while high humidity means triple-digit feel-like temperatures in the south, and heat building to record status in the northwest. in fact, by monday, temperatures could be as high as 105 degrees in portland, oregon. and you know, heat this rare is very extreme in areas in the northwest, which could prove to be very dangerous. whit? >> whit: samarra theodore, thank you. next tonight, a deadly and fiery home explosion near pittsburgh this morning. at least one person is dead and several others unaccounted for. flames from the blast destroying or damaging nearby homes. emergency responders searching the rubble tonight for survivors. here's abc's jaclyn lee. >> reporter: tonight, a fatal home explosion rocking this pittsburgh suburb, flattening buildings and scattering debris across the neighborhood. >> this is the worst i've seen in 47 years, just due to the amount of damage. >> reporter: authorities in plum, pennsylvania, responding to reports of the blast just before 10:30 a.m. local time.