There is an elevated risk of severe storms this afternoon and evening, mainly across Osage and Pawnee counties in northeast Oklahoma. Large hail to 2 inches in diameter, damaging winds to 70 mph and an isolated tornado are possible. A limited risk of severe storms exists southeast of the elevated risk area, and includes areas to the north of the I-44 corridor in northeast Oklahoma. Hail to the size of golf balls and damaging winds to 60 mph are possible in the limited risk area. A marginal severe risk lies along and to the southeast of the I-44 corridor across east central and northeast Oklahoma and far northwest Arkansas for tonight. Storms are expected to develop from southwest into north central Oklahoma and southeast Kansas this afternoon along a boundary. This activity will gradually migrate into northeast Oklahoma during the late afternoon and evening hours. The storm potential will gradually spread east during the overnight as the boundary sinks southeast into the region, though severe potential is expected to wane during this time. Locally heavy rainfall is possible if storms can train over the same areas tonight. Isolated to scattered storms remain possible mainly during the daytime hours Sunday thru Tuesday across western Arkansas and southeast Oklahoma. Daytime thunderstorms will be possible across all of eastern Oklahoma and western Arkansas Wednesday thru Friday. While isolated severe storms can`t be ruled out, a more widespread organized severe event is not expected due to weak flow aloft.