There are some changes to the extended portion of the forecast as
the invasion of the next shot of cold air now looks to come in as
early as Thursday. Unlike the previous cool down earlier in the week
that was brief, this round of cold will likely stick around for at
least a few days, possibly right through next weekend.
Brief zonal flow mid week quickly amplifies starting Thursday as
large upper ridge builds across the Rockies northward into Canada
forcing a deep trough to carve out across the eastern third of the
CONUS. There will be several shortwaves and associated surface cold
fronts/troughs bringing reinforcing shots of cold air Thu-Sat.
However, the airmass looks to be fairly dry, so not expecting much
more than some light snow showers from time to time as of now with
the passage of any wave. Otherwise, this will translate to below
normal temperatures for the latter part of the week through as least
next weekend.