Friday 9 a.m.
The computer models all show a precipitation-producing feature affecting areas over or near the Middle Atlantic coast late tonight (1 a.m. to 7 a.m. period), but they differ from each other in important ways. This is really a time when you should plan to check back on accuweather.com a number of times as you go through the weekend. Here is the European model's take on this.
The GFS has the same features but is farther along than the Euro. The Euro showed some enhanced precipitation in New Jersey and New York City during this period, while the GFS has the same thing in southern New England.
The NAM seems to have the same timing as the European model but is lighter and less extensive with the precipitation:
The current maps with precipitation areas give few clues about which model will be best.
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:
This map shows two cold fronts in the northeast quarter of the nation; 9 a.m. ET temperature are plotted. The isobars are closest together over the central and western Great Lakes, and this is where the strongest winds were occurring.