The Middle and North Atlantic states will emerge from the depths of harsh cold tomorrow, and weekend high temperatures can easily reach 40 or higher (50s in D.C.). A storm that brings several inches of snow to Chicago on Saturday will likely follow a path that takes most of the snow north of I-90 in the Northeast. This video show things should progress.
Looking ahead to next week, it appears a large storm will move from the southern Plains to New England at midweek, with heavy snow north and west of the track and rain elsewhere... maybe even thunderstorms in the Southeast. This snapshot map is from the GFS model for next Tuesday night. Since that is still almost a week away, future adjustments are virtually certain.
After reaching the 80s today from NYC to Boston, it might not be that warm again through much of next week.
A noticeable push of cooler air will spread southward from Ontario and Quebec into the eastern Great Lakes and New England between tomorrow and Saturday.
A cold front from eastern Canada will slide southward along the East coast between late Friday and the end of the weekend. For the area from Philadelphia to Boston, where temperatures will reach the summery 80s each day through Friday, it will mean a noticeable change to cooler weather.
Average high temperatures in Chicago and New York City are in the mid-70s now, but for the next several days, temperatures will run 8-15 degrees above those long-term averages. Supporting this warmth is a flow aloft that originates over the Southwest:
Rain was common in the Northeast this morning, though Boston was still waiting as of 9 a.m. Their summer dry spell has continued.
There will be an increase in warmth and humidity in the Northeast that will not be reversed until the next cold front arrives.