OKLAHOMA CITY -- A section of the Midwest stretching from Texas to South Dakota is at risk for large hail, strong wind gusts and tornadoes Saturday afternoon and evening.

The Storm Prediction Center in Norman, Okla., said isolated to scattered severe storms are expected to develop across the central and southern Plains on Saturday afternoon and continue into the overnight hours.

The main threat will be large hail and damaging wind gusts. The strongest area for storm potential is centered on northern Texas and southwestern Oklahoma.

The National Weather Service's Norman forecast office said hail up to the size of baseballs and wind gusts up to 65 mph will be possible Saturday evening from northwestern Texas to southwestern Oklahoma. As the storm moves east overnight, wind gusts will pick up and tornadoes will become possible.

On Sunday, the Storm Prediction Center said, an outbreak of severe storms is possible across parts of the central U.S. Large hail, damaging winds and tornadoes are possible.

The greatest risk for tornadoes Sunday will be in Arkansas as well as parts of Louisiana, Missouri, Oklahoma and Texas.

Organizers of outdoor events have kept a watchful eye on weather conditions. Organizers with the Oklahoma City Marathon, set for Sunday, urged runners to be aware of the race day alert system intended to warn participants of impending bad weather. Three shelter locations have been picked to house runners and spectators if the stormy weather moves through.

In northwest Arkansas, the University of Arkansas rescheduled its Sunday baseball game against Auburn, instead opting for a doubleheader Saturday afternoon.