.LONG TERM /THURSDAY THROUGH SUNDAY/...
The pattern starts to at least try to change as the long term
progresses with a deep trough developing over the western CONUS.
This eventually allows for Pacific moisture in southwest flow to
advance toward the Great Lakes by late this week as the resident
ridge gradually deamplifies and becomes more positively-tilted. A
leading shortwave trough may start to work at the apex of the ridge
by Thursday with the Canadian and ECMWF favoring this scenario. This
would lead to less warm weather later in the week and wetter
conditions, however the GEFS doesn`t favor this scenario and
instead spins up a massive system for next weekend. Given the
amount of time between now and these eventualities, a blended
solution was favored with a modest decrease in warming late in
the week. While the models don`t agree much between Thursday
and then, there does see to be decent agreement on the next
shot of Arctic air making its way toward the region by the end
of next weekend. Granted, modeling systems all seem to be too
aggressive with these types of situations, so it wouldn`t be all
too shocking if it was delayed, but it certainly seems like the
trend amongst global ensembles to favor troughing spreading
east across North America beyond day 7.