BOX:
“10 AM Update... It would appear that yet again it was the NAM that best caught on to the evolution of the warm nose with this winter system. Correlation coefficient, mping reports, and a plethora of public reports all together tell us that the snow/sleet line has moved as far north as southern Worcester county in central MA and northern Norfolk county in eastern MA. 12Z NAM guidance is right on track with this so the forecast continues to follow that most closely, lifting the mixed precip line as far north as Route 2 or just south by 11am to noon before colder air enters and switches things back to snow by early to mid afternoon. Forecast is largely on track.”
More than once it has been mentioned here than NAM is very good it picking up on the mid level warmth in these events…