Life-threatening' heat warning across much of US Overall pattern looks like it is going to stick around well into July,' meteorologist says msnbcmedia1.msn.com/j/MSNBC/Components/Photo/_new/120628_HeatWave.grid-8x2.jpg http://www.msnbc.msn.com/id/47991674/ns/weather/#.T-x5r7We58E