Isolated thunderstorms are possible Tuesday night in the Nebraska City area, forecasters say, and coverage may increase overnight with a few storms producing hail.
Thunderstorms are forecast to continue into Wednesday morning before a brief decrease in activity in the late morning and early afternoon.
More thunderstorms are likely Wednesday afternoon and evening as a stronger cold front moves into eastern Nebraska, western Iowa and northwest Missouri, the National Weather Service office in Valley said.
Strong to severe storms, with large hail and damaging winds, will be possible. There is some potential for a tornado or two between 5 pm to 8 pm, southeast of a line from Seward to Onawa.
Instability and wind shear will be adequate for some super-cell storms. As the evening progresses Wednesday, it appears there will be a transition to more outflow dominate storms with strong winds.
The NWS says there is a 40% of showers and thunderstorms Wednesday and Wednesday night for the entire region.