Threats for severe weather and flash flooding for portions of theCentral Plains into the middle/lower Missouri River Valley throughSaturday......Excessive heat over the West and Southwest through Saturday but somerelief coming on Sunday...Most of the active weather across the lower 48 will focus across thecentral portion of the nation through the weekend in the form of severethunderstorms and potential for flash flooding. Anomalous moisture willpool in the vicinity of a pair of frontal bounda...