Starting this weekend and continuing for much of next week the weather patterns will change. The ridge of high pressure that has been bringing the relatively dry pattern for much of December will shift out of the region. The new pattern that we will get is a zonal flow westerly flow which will bring moisture in and out of the region. With this pattern above normal precipitation and snowfall will be the pattern towards the end of December. The map below (500 mb- 18,000 feet) indicates this. This map is for the period 12-28-2011 through 1-3-2012
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