a dangerous heat wave is set to scorch massive parts of the country this week. cbs news meteorologist with what we can against, jeff good evening. >> good evening, the heat wave that is building and intensifying across the west is about as extreme as it can get for this time of year. we have a record-breaking heat dome taking shape across the rockies, this will slide towards california as we head into wednesday and thursday, we could see as many as 150 records broken or tied over the next several days. high temperatures are going to be way up there, about 15 to 30 degrees above normal for this time of year, places like billings, montana, 107 is possible on tuesday, look at the deep southwest, palm springs, phonix, 120 degrees and watch sacramento, up to 113 degrees there. this is on top of an exceptional drought. 27 percent of the west covered under exceptional draught, the worst category.