PHILADELPHIA (AP) — The heat wave gripping parts of the country including Philadelphia, where tens of thousands are descending upon the city for the Democratic National Convention this week, is not going away anytime soon and will hit a peak Monday with temperatures in the city feeling like 108 degrees. Excessive heat warnings will continue Monday, the first day of the convention, in the Philadelphia area, most of the Midwest and regions out west. The dome of high pressure traps hot air and is the basis for the "critical high temperatures" the country has been experiencing the past week, Robinson said, even for being the warmest time of the year. "The Northeast is a little bit of a mixed bag, but the bottom line is that the conditions have deteriorated over the past several weeks to a couple of months," said Rich Tinker, a drought specialist at the National Oceanic and Atmospheric Administration.