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A third round of mountain upslope snow showers is due to arrive on Monday night and Tuesday. Like before, the best chances of accumulating snow will be on west-facing slopes and in higher elevations near the Virginia-West Virginia border and, especially, in eastern West Virginia. (Does the Hydrometeorological Prediction Center snowfall forecast map at left look familiar? The blue is a 10-39 percent chance of 4-plus inches, the green a 40-69 percent chance. Looks like the last two snow shower events. More snow for West Virginia ski areas.) Like before, there is a chance that a more intense upper-level disturbance moving through the northwest flow could rack up higher snow totals in a localized area or even spread snowfall farther east. Unlike the last two systems, this system will involve a rather potent surface low over the Great Lakes dragging a cold front through. The system will sweep in slightly milder air ahead of it, so anything that falls on Monday will likely be rain -- though sleet or freezing rain can't be ruled out entirely, especially in colder valleys or right as the precipitation begins. Once the front pushes through, cold northwest winds will kick up again, snow showers will begin to form as these winds glide up the western slopes of the Appalachians, and another blustery week of weather will set in for Thanksgiving.