Wednesday 7 a.m.
My video shows two different scenarios on the extent of rain from a storm now just off the North Carolina coast. Rain appears likely for the I95 corridor from Richmond through D.C. and on northeast to New York City. Places outside the storm's reach will have fine weather for the rest of the week,
This map shows the pressure pattern around the Carolina coastal storm. The strongest winds are found where the lines are closest together.
The upper-air pattern is forecast to change from one favoring warmth across the Great Lakes and most of the Northeast to one favoring the advance of chilly air from central Canada, The top map is a forecast for late this week; the bottom is for two weeks from today.
Wet weather is coming toward the Northeast, and episodes of rain may be spread out over a two- to three-day period. Supporting this idea is this satellite/radar image from mid-morning Monday showing pockets and bands of rain affecting several areas.
On this map from 10 a.m. ET Thanksgiving Day, you can see the high pressure area that is causing dry and mild weather in the East and the cold front farther west.
During the late afternoon and early evening hours, the cold front of a knife will slice through the turkey and cause it to accumulate 1-2 inches on plates...
This satellite picture shows clouds over parts New York and Pennsylvania, as well as areas of low clouds, fog and snow cover from Michigan to Illinois. Most of the Northeast should have at least some sunshine through Thanksgiving Day.
As we go through the week, the flow aloft over the East will become southwesterly. This will promote a major warmup. This map shows the projected upper-air flow for Thanksgiving afternoon:
A major snowstorm will affect the area from Iowa to Michigan tonight and tomorrow. At first, snow can melt on streets, but as it continues and the temperature drops, the area impacted by slippery conditions will increase dramatically. This map shows expected accumulations: