Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
244 AM EST Sat Feb 18 2023

Valid 12Z Sat Feb 18 2023 - 12Z Mon Feb 20 2023

...Locally heavy snow to spread across the high terrain of the Northern
Rockies and Northwest...

A vast majority of the country will have very little if any precipitation
this weekend and into the start of this coming week. However, potentially
heavy mountain snow forecast forecast for the Pacific Northwest and the
Northern Rockies. Northwesterly flow aloft around an eastern Pacific
upper-level ridge will allow for waves of moisture to enter the region.
Some of the highest snow accumulations are expected in the favored upslope
areas which may reach a foot prior to Monday. Lower elevations across
Idaho and western Montana may also experience lighter snowfall amounts.

A chilly airmass is settling in over much of the eastern third of the
country after the cold frontal passage. Lingering Lake effect snow showers
are possible  early today, along with upslope snow throughout the central
Appalachians. Scattered showers are expected to continue along the cold
front as it moves southward across the Florida Peninsula. Easterly flow
will continue across the Sunshine State this weekend and allow for
isolated shower chances. Lastly, in terms of precipitation, light snow may
traverse the Northern Plains and Upper Midwest on Sunday, while shower
chances enter Arizona and New Mexico ahead of a churning upper-level low.
Below average temperatures are forecast across the southern tier on today
underneath a modest high pressure system. Above average temperatures then
become more widespread on Sunday (outside the Rockies and Intermountain
West).

Campbell

Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php