Numerical model simulations of a surface cold front are performed to examine the role of differential cloud cover on frontal propagation speed. The cold front occurred on 12 August 2002 when an unusually strong mid level trough propagated through the upper Midwest. Precursor disturbances initiated convection ahead of the cold frontal boundary early on 12 August. Cloud cover eventually eroded ahead of the front while staying cloudy behind the front. Numerical model simulations using MM5 will explore the role of clouds both with and without the cloud radiation effects. In addition, rawinsonde and surface data will be used to update the model initialization. We will also explore the role of different model physics. Results from the model simulations will be presented at the conference.