Usually, the first two spell disaster, and in the case of northern MO, it will be a very dangerous situation tonight and tomorrow.
Currently, a low pressure system located in the Colorado Rockies and its northeast advancing warm front are bringing enough lift to cause rain. But a cold dome of air that was brought here late Sunday is still lingering on causing this rain to freeze.
As of this post, the temperature is 32° and climbing, so we won't receive much if any glaze. Northern MO won't be so lucky, as they aren't expected to see above freezing temperatures for a few days, and could receive up to 1/2" of ice. That is enough to snap branches and cut power for days, as it did in Springfield, MO two winters ago.
Another chance of snow exists for the area on Saturday.