Denver will offer cooling centers at rec centers this weekend to help residents escape the high temperatures forecast from Friday through Sunday. The National Weather Service has issued a heat advisory that is in effect from 10 a.m. to 8 p.m. on Friday, Saturday and Sunday, noting that most of the state will see high temperatures between 99 and 104 degrees. The city will open cooling centers in all currently operating rec centers during their business hours over the weekend.