Source: Zack Leasor, 573-882-5908; Karen Funkenbusch, 573-884-1268Columbia, Missouri – The Fourth of July in Missouri might be hotter than a firecracker this year, according to University of Missouri Extension state climatologist Zachary Leasor.The heat wave is forecast to blanket the state with highs in the upper 90s or even the low triple digits, according to…