CTP seems to be interested in the Monday snow chance. Very nice write up this morning
“The most interesting weather will be Monday, mainly in the morning and early aftn. A fast-moving low just now coming on- shore in the western U.S. will be arriving. Clouds will increase Sunday night, with a dusting of snow possible as an arm of warm advective precip crosses the NW half/two-thirds of the CWA overnight. The sfc trough which crosses the area will bring enough moisture to worry about a wint wx advy for a good portion of the area. The fast forward speed and daylight passage of the main slug of precip will be negatives for higher snow totals. The timing of the precip is about 3-4 hours different between the GFS and NAM at this point. The faster GFS would put down much of the precip very early in the day (some before sunrise in the wrn half). This would make it more likely all snow than a mix or plain rain. The slower NAM keeps the precip snow for a long time, as well, despite precip not arriving in the Lower Susq just an hour or so before Noon. The precip rates may also dictate what the p-type will be. Models all pumping out 0.15-0.4" of liquid equiv of pretty much all snow in just 3-5 hrs as the main wave of precip moves thru in the morning. That means 1"/hr rates are possible. But, the wind will not be all that gusty (S <10MPH and no real gusts) as it passes thru. Have nudged maxes down a deg on Monday looking at the cloud cover and snowfall. Snow amounts may end up 2-4" for lots of places, some higher amounts possible in the NW and lower amounts possible in the south-central mountains. The precip lingering behind the first shove of moisture could turn to rain in the SE, but I could easily see 1-2" there, and higher numbers are poss judging from NAM QPF of 0.4" despite SLRs in the 8-10:1 range. Since this event could negatively impact the Mon AM rush, this will need some close attention. Upright instability during the first/main push of precip on Monday is hardly noticeable if any exists. Some CAPE shows up in the aftn across the NW half of the area when the real trough moves through. So, if there is some heating, there could be some squalls there later in the day. But, additional accums will likely be less than in the morning hours.”