Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 255 AM EST Wed Jan 09 2019 Valid 12Z Wed Jan 09 2019 - 12Z Fri Jan 11 2019 ...Accumulating snows continue today across the Great Lakes into interior New England... ...Lower elevation rain and mountain snow on Wednesday for northern California and the Pacific Northwest... ...Moisture begins to increase by Friday ahead of a developing low pressure system in the Southern Plains... Snow across interior portions of the Northeast will continue through today as a surface low intensifies and moves up the New England Coast and into the Canadian Maritimes by Thursday. As much as 6+ inches of additional snowfall is still possible across parts of the lower Great Lakes into northern New England where winter storm warnings and winter weather advisories remain in effect. North to westerly winds on the backside of this storm is likely to allow for light lake effect snows into Thursday as well downwind of the Upper and Lower Lakes. This system will usher in a much cooler air mass into much of the Eastern U.S. as the storm moves away and surface high pressure builds into the region. Meanwhile, low pressure in the Northeast Pacific with a weakening frontal boundary moving into the West Coast will continue to bring precipitation from the Pacific Northwest into California on Wednesday. Rain, locally heavy at times, is expected in the lower elevations, with some accumulating snows for the higher terrain, especially the Cascades and Sierra Nevada ranges. Some wintry precipitation is also expected to make it farther inland into the Intermountain regions as well. After a very cold morning, a quick warm-up should move into the Northern Plains by Thursday and into Friday behind a warm front with warmer than average temperatures also extending into the Central Plains and Upper Mississippi Valley. Farther south, moisture should begin to increase across Texas by the end of the period as upper level energy moves towards the region and an area of low pressure begins to take shape in the Texas Panhandle. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php