Little change in the thoughts from yesterday. Feeling a bit more confident on the specifics of this system. The surface low has not developed yet but will over SE CO into the Panhandles of TX/OK, tonight. In its advance, a southwesterly flow will develop from east TX into WI. This will allow warmer and more moist air move northward. A band of freezing rain will develop from south central IA into southeastern IL after midnight, tonight, in response to the return of the warmer and more moist air. Amounts will be light, below a 1/10 of an inch but enough to create some travel problems, especially on bridges. This area of precipitation will track off to the NE and expand through the day on Monday. It will also turn into more of a snow event, especially from MN-MI.
Monday afternoon will also see snows expand along the Rockies from WY to Northern NM. Rain will begin to develop from TX into western MO. The surface low will move into western OK.
Monday night will see the system become much better organized. Moderate to heavy rain will spread across much of eastern OK into central IN. Even a few thunderstorms are possible from eastern TX into southeastern MO. Accumulating snow will be falling from SE CO to MI. Affecting much of the western 2/3 of KS, NE, IA, WI, MI and MN.
Tuesday, the surface low will track NE across MO into NW IN. Rain and thunderstorms will progress eastward into the OH Valley and the SE. Some severe thunderstorms will be likely across LA/MS/SE AR/W TN. As cold air punches into OK/MO/IL, rain will change over to snow. Some accumulating snow will be possible from OK, mainly along and north of I-40, along and north of the I-44 corridor through MO and along and north of I-70 in IL.
Tuesday night, the low will rocket into the eastern Great Lakes and Ontario. Rain will stretch from the central Gulf Coast to southern New England. Snow will be occurring from northern New England through the OH Valley. This is some question as to whether or not a secondary surface low ill develop across the NE Gulf or not during this time period. Still believe one will and it will track along the east coast during the latter half of the work week.