 Together with the resources of News Center 7, you're on Dayton's number one news team. Now, back to Miami Valley's morning news on WHIO. 547, I'm Larry Hanskin. We've got 74 degrees in Dayton. Here are the big three things you need to know. Chance for some scattered thunderstorms this morning, then mostly cloudy this afternoon with a high of 82. Mosquitoes in Clark County test positive for West Nile virus. And our top story, Columbus police working security at the RNC shoot a man with a knife.