Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 301 AM EST Tue Jan 22 2019 Valid 12Z Tue Jan 22 2019 - 12Z Thu Jan 24 2019 ...A winter storm is expected to impact parts of the central Plains into the upper Midwest and the Great Lakes through Wednesday... ...Active weather returns to the Pacific Northwest... ...Very cold conditions across the eastern U.S. will moderate... A low pressure system continues to consolidate as it exits the central Rockies into the central Plains this Tuesday morning. Parts of the central High Plains has already been impacted by blizzard or near-blizzard conditions as the storm intensifies. This low is forecast to track east-northeast across the central Plains and into the Great Lakes through Wednesday. A swath of snow is expected to the north of the storm track with a foot of accumulation possible over the Great Lakes. Some mixed precipitation can also be expected near the storm track, as well as parts of interior Northeast on Wednesday. South of the storm track, rain is expected to fall ahead of a cold front, especially over the Southeast later on Wednesday into Thursday morning where heavy rain along with thunderstorms are possible. Before the arrival of the aforementioned cold front, very cold air will dominate much of the Eastern Seaboard. However, as the cold high pressure system gives way to the developing low pressure system coming from the central Plains, temperatures will moderate to above normal levels on Wednesday under increasing southerly flow. Meanwhile, moisture associated with a rather energetic Pacific cyclone is about to reach the Pacific Northwest. Rain could become heavy later today over the coastal sections as well as across the Olympic peninsula. The moisture will then continue to penetrate further inland, reaching the Intermountain region on Wednesday in the form of snow. The snow will move into the northern Rockies Wednesday night and early Thursday just as the next surge of arctic air from central Canada arrives. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php