Here are experimental radar forecasts that show the development of the winter storm and the potential thunderstorms.
The graphic below is valid at 6pm CST:
The forecast below (courtesy of the NWS) is valid at 10pm this evening:
The above forecasts do not differentiate rain versus snow. From a separate forecast model (hat tip: Dr. Ryan Maue) is the rain versus snow for 6pm this evening:
11:59pm this evening:
6am Friday morning:
This set of graphics should give you a good idea of the timing of the storm.
While the snowfall forecast below still looks good, some preliminary guidance from the new model runs indicate more than a foot of snow may fall farther south in eastern Nebraska and far western Iowa from Grand Island to Lincoln to Omaha to Council Bluffs. While still preliminary, keep this in mind if traveling.