Monday, February 12, 2007
Winter Mix Continues to Develop
Team Forecast @ 9:30 PM
Now
*Winter Storm Warning in Effect from 4am Tuesday morning through 2pm Wednesday afternoon*
Light mixed precipitation, cold. Late this afternoon, radar showed a band of light snow (generally west of the District) and mixed precipitation (DC eastward) streaming out ahead of a cold front moving southeastward from the Great Lakes. Meanwhile, a low pressure area getting organized in the Southern Plains was preparing to move northeastward along the boundary between the Arctic air to the north and the warmer, more humid air to the south. This afternoon's latest models continue to indicate that the warmer air will move northward at upper levels over the Mid Atlantic area, eventually displacing the cold air near the surface. Because cold air is more dense, it can be difficult to displace, making it almost impossible to specify the exact timing at any given location of an expected changeover from snow to sleet and freezing rain, to rain in some places.
Based on the latest available information, we are holding our timeline and accumulation forecast as shown in the earlier post below. Scroll down for that information. We will continue to monitor the situation tonight with updates if necessary and periodic reports as conditions develop tomorrow.
Temperatures this afternoon reached 40° for the first time this month, with highs of 43° at National and Dulles, 46° at BWI.
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