A jet stream trough will dig across the Eastern two-thirds of the United States this forecast period, and this will make cold air available to a majority of the country, eliminating any widespread above normal temperatures. The coldest air will be present for the start of the forecast period, with moderation to near-normal temperatures possible for the end of the period.
In the interim, two disturbances will likely create back-to-back storms in the Eastern United States - one around midweek, and the other toward week's end. Both of these storms will utilize a southern disturbance and attendant Gulf of Mexico moisture, and rain/snow line will be determined in each event by eastern extent of cold air associated with the longwave trough. Interestingly, though the intensity of cold in the East may be greater early in the period, New England, in particular, may have more available cold for the second storm, given a strong anticylcone over South-Central Canada and the Upper Lakes later in the week.