Mar 9, 2012; 8:12 AM ET
Friday 9 a.m.
The video today shows colder air moving into the Northeast. Also, some places that were in the 50s and 60s will have snow. It has been snowing this morning from southern Michigan to western New York, and that snow could streak eastward across central and southern New England tonight.
Tomorrow's temperatures will not get out of the 30s from Maine to northern Pennsylvania, However, mild air comes back in a big way on Sunday afternoon. Numerical forecast models suggest it will be mild to warm in the Northeast next week and the week after!
The National Weather Service's GFS model (the one I use most often in my videos) is run many times to produce an ensemble of solutions. Each run has slightly different initial data, a practice justified by the fact that a set of "real" observations does not exist for all points on Earth. Anyway, if you plot certain contours, such as the 500 mb flow aloft, you can see how well the model runs agree or don't agree with each other out into the future. Because these lines may go all over the place, the plots are called spaghetti plots. This map shows a plot for Monday, March 19. The individual lines for each contour do not all go the same way, but all of them suggest that the air coming into the Northeast originates in the Southwest.
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