Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 234 AM EST Tue Jan 08 2019 Valid 12Z Tue Jan 08 2019 - 12Z Thu Jan 10 2019 ...Heavy snow likely across portions of the interior Northeast Tuesday into Wednesday... ...Heavy precipitation moves into the West Coast on Tuesday... ...Much above normal temperatures on Tuesday quickly change to below normal by Wednesday from the Northern Plains to the Ohio Valley... A weakening area of low pressure moving through the Great Lakes into New England will continue to allow for some wintry precipitation across the region this morning, with a likely changeover to rain or a rain/snow mix for most by Tuesday afternoon. A second low pressure area enters the Northeast today, and is expected to deepen as it moves up the coast. This storm will usher in much cooler air resulting in rain changing back to snow with moderate to heavy snow accumulations likely from the Central Appalachians to interior portions of the Northeast, as well as downwind of the Upper Great Lakes. The greatest accumulations, likely in excess of 8 inches, is expected to fall from upstate New York to northern Maine. Winter weather advisories and winter storm watches are in effect for portions of the Northeast. On the West Coast, the next round of precipitation arrives Tuesday morning as a deep low pressure system moves across the eastern Pacific. Locally heavy rainfall is likely in the lower elevations of northern California and the Pacific Northwest with localized flash flooding possible, especially along favored upslope regions of northern California. Accumulating snows are possible in the highest terrain, particularly from the Cascades to the Sierra Nevada and eastward into parts of the northern Rockies. Light freezing rain is also possible in the lower elevations of the Cascades and into parts of northern Washington and the northern tip of Idaho. The eastern half of the country will be warm to start the short range period with daytime highs on Tuesday as much as 20 to 30 degrees above normal across the Ohio Valley and parts of the Mid-Atlantic. Colder air arrives by Wednesday and looks to linger towards the end of the work week. Windy conditions across the northern Plains are also likely to result in sub-zero wind chill values on Wednesday morning. In the West, temperatures should be near normal for most places with slightly warmer air arriving by Wednesday. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php