Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 242 AM EST Sat Dec 12 2020 Valid 12Z Sat Dec 12 2020 - 12Z Mon Dec 14 2020 ...Light to moderate snow to continue throughout portions of the central Great Lakes today and enter northern Maine by Sunday morning... ...The next winter storm threat currently over the Intermountain West will bring a swath of snow from the central/southern Rockies, across the central Plains, and eventually toward the central Appalachians by Monday... ...Additional coastal rain and mountain snow to enter the Pacific Northwest and northern California this evening through Sunday... A low pressure system currently located over central Illinois is producing light to moderate snow from central Iowa to northern Michigan. Additional snowfall amounts of 6 to 12 inches are expected through this evening across northern Michigan, where Winter Storm Warnings are in effect. Snow is also expected to spread across northern Maine tonight, with places such as Caribou potentially receiving upwards of 6 inches of snow. Freezing rain will also be possible across portions of northern New England. Further south, warm southerly winds will lead to temperatures feeling quite comfortable for mid-December across the eastern third of the United States this weekend. Scattered showers and thunderstorms could put a damper on any outdoor activities however. The next winter storm threat to keep an eye on is forecast to bring light snow to portions of the Intermountain West, central and southern Rockies today. As the associated deep upper-level trough swings into the southern Plains by Sunday, wintry precipitation is expected to break out across the central High Plains and eastward towards central Oklahoma. Snowfall amounts over 4 inches will be possible from southeast Colorado to central Oklahoma through Sunday evening. This could lead to snow-covered roadways and limited visibility across the region at times. By Monday morning, there is the potential for light snow across portions of the central Appalachians and northern Mid-Atlantic States; however, there still remains rather large uncertainty whether temperatures will be cold enough to support any impactful accumulation. Meanwhile, there is higher confidence that locally heavy rain could fall across the southern Appalachians, as well as portions of North Carolina and Virginia during this time frame. Across the West Coast, after a short relief from active weather another round of heavy coastal rain and mountain snow will enter the region this evening and last through Sunday. Rainfall amounts of 1 to 3 inches will be possible for coastal regions from northern California to Washington. Meanwhile, around a foot of additional snowfall is likely on both the Sierra and Cascade mountain ranges. Snell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php