Large-scale pattern features the amplified ridge axis shifting
eastward, off the Atlantic seaboard. This sets up a broad moist-
sector with PWAT values per GFS/Canadian rising to summerlike and
tropical-type levels (around 1.75 to near 2") by late in the week.
This feed of moisture is tied to southerly flow ahead of a closed
upper-low progged over the lower MS Valley/eastern portions of the
Southern Plains, with another northern-stream upper trough in the
stronger belt of westerlies over the northern Plains/Canadian