The best bet for weather info is to go to the National Weather Service website.
www.weather.gov This brings up a national map. You can then click over the omaha area to bring up the local weather service forecast. They have been updating the Winter Storm with web briefing updates you can watch. Here is the link for the one at 1 pm Wednesday
http://www.crh.noaa.gov/oax/?n=webbriefing
They are talking about a little dryer air, so have reduced some of the snow fall totals. Storm will move from west to east, so the farther west you go, the quicker it will start. They think snow will start about Noon in Omaha.