Replay from the National Weather Service, Norman Forecast Office (regarding question to them about the Lawton/Fort Sill area):
It still appears that the heaviest snow will impact location across both nw/north central OK and central/e central OK. The precipitation will begin as early as midnight tonight as rain/thunderstorms. Then, after 6 AM sleet and snow will be possible, turning to almost all snow after lunchtime. Total accumulations for the Lawton area will be around 2-4 inches, with dangerous driving conditions due to blowing snow and slick roadways.