With warmer temperatures forecast for later this week, authorities are reminding parents about the dangers of leaving children unattended in a vehicle. There have been eight such heatstroke deaths in the U-S already this year. Jannette Fennell with KidsAndCars.org suggests always looking before you lock, or leaving an important item, such as a cell phone or handbag in the back seat so you have to open the back door to retrieve it every time you park. On average, nearly 40 children die each year from heat-related deaths after being trapped inside motor vehicles.