In a previous post I discussed the “wedge,” a weather phenomenon that brings cool air down the east side of the Appalachian Mountains into the Southeast.  Officially, it is called a cold air damming event, since the mountains prevent the movement of cool dense air into the mountains but direct it along the eastern slopes.  Some wedges are relatively weak and only cover northeast Georgia but the one today is a doozy, bringing cool northeast winds, clouds and relatively cold temperatures to most of Georgia and the Southeast, with the exception of NW Georgia.  You can see the flow of cool air clearly in this surface temperature map.  A combination of a developing low pressure area off the East Coast and high pressure to the west has increased the intensity of the flow in this event.

wedge 9-25-2014