Another northeaster threatens but details still elusive

1. This map shows the pressure pattern at 7 a.m. There is a cold high pressure area in east central Canada and a low pressure area heading east from the southern Plains.

2. There is great uncertainty as to whether the bulk of the storm will be confined to areas south of I-80 (or even I-70/I-76)... or instead take a turn up the East Coast at midweek. The GFS ensemble mean (which represents an average of all the individual model runs) predicts the following snowfall amounts for 8 a,m. ET Tuesday, Wednesday and Thursday:

forecast for period ending 8 a.m. ET 3-20-18

forecast for period ending 8 a.m. ET Wednesday. The map for the next day at the same time follows:

3. Today's video: