Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
259 AM EST Tue Dec 27 2022

Valid 12Z Tue Dec 27 2022 - 12Z Thu Dec 29 2022

...Increasingly stormy weather to impact the West Coast through Tuesday
before spreading across Rockies...

...Lingering lake-effect snows downwind from Great Lakes will become less
intense and fade on Tuesday...

...Temperatures in the Midwest and East moderate this week...

The western states will become increasingly more active as an atmospheric
river moves inland in conjunction with a low pressure system and its
attendant cold front. As a deep layer of moisture streams onshore it will
help spread a few inches of rainfall/feet of snowfall at elevation
possible along the coastal areas and south into central California through
early Wednesday morning. The pattern will present the possibility
for widely scattered instances of flash flooding are possible at lower
elevations, particularly in burn scars. Increasingly strong winds are a
concern today in these areas, especially near the coast and at higher
elevations as the center of this potent low reaches coastal Washington.

Meanwhile, temperatures are expected to moderate across the Midwest and
the East over the next few days ahead of this system. The long-duration 
lake enhanced snow bands will shift northward as well as diminish as the
low level winds become more west/southwesterly through the day. Locally
hazardous travel conditions are possible for as long as they persist.

Campbell


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