At about 1645 central time, a Piper PA-28-180 struck terrain near Clarkfield while flying VFR in an area with visual to instrument conditions. The pilot was killed. The flight was en route from Norfolk, Neb., to Montevideo, Minn., on a VFR flight plan but did not arrive as scheduled. The wreckage was found about eight hours later. Weather conditions at the time included ceilings of 1,200 to 1,400 feet and visibility of 2.5 to 7 miles with mist.