Looking at the extended, we are going to be on a houseboat on July 17-19th and am hoping for nice warm weather, but not oppressively hot. The GFS and Euro are miles apart. The GFS is seasonably cool while the Euro has a major heat wave. Below is early afternoon on the 17th. I'll be in northeast Iowa right up by the Iowa/MN/WI borders. GFS has heat indices around 80, the Euro around 100.