NORMAN, Okla. (AP) - Stormy weather is in the forecast for parts of the Southern Plains on Friday.

The Storm Prediction Center in Norman, Oklahoma, says the area at greatest risk for thunderstorms and hail includes central and southern Oklahoma, northern Texas and southwest Arkansas.

A severe thunderstorm watch is in effect for much of Arkansas and eastern Oklahoma until mid-morning Friday. Forecasters say strong thunderstorms are expected with the possibility of large hail, and tornadoes can't be ruled out.

A flash flood warning is also in effect for Little River, Howard and Sevier counties in southwestern Arkansas and McCurtain County in southeastern Oklahoma, where heavy rainfall is expected Friday.