Water vapor imagery suggests a disturbance is moving to the east, and this is reflected by shower and embedded thunderstorm development in a linear fashion now entering the Midwest region. This disturbance will continue moving east, and could very well strengthen, as a water vapor loop sees an enhancement of moisture currently ongoing in southern Canada in close proximity to the disturbance.
The line is expected to traverse the coast and move offshore. Model guidance does suggest sustained winds in excess of 20 knots in some areas, so a damaging wind event is certainly a possibility, as the SPC is suggesting.
REMEMBER: The Official 2012-2013 Winter Forecast will be released TOMORROW at 12:00 PM CT.