Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 300 PM EST Mon Feb 05 2018 Valid 00Z Tue Feb 06 2018 - 00Z Thu Feb 08 2018 ...A new threat of heavy rain will be developing for the lower Mississippi and Tennessee Valleys toward the middle of the week... ...More snow and some ice will be setting up across the Ohio Valley and the Northeast as a new storm impacts the Eastern U.S in the coming days... ...Mild temperatures continue over most of the Western U.S. while frigid weather remains east of the Rockies... Coastal rain and mountain snow will begin to decrease in intensity and coverage across the Pacific Northwest and east to the Northern and Central Rockies as onshore flow steadily reduces. High pressure over the Interior West/Great Basin will keep mild and dry conditions over the much of the region. Maximum temperatures are forecast to average 10 to 20 degrees above normal. Colder and drier air has settled into the Ohio Valley, Northeast and Mid-Atlantic in the wake of a cold frontal passage. Another cold front is forecast to swing through the Great Lakes and Ohio Valley this evening and though the Appalachians, northern Mid-Atlantic and Northeast on Tuesday. This system will usher in another blast of cold air and spread snow, heavy at times, from the Great Lakes, Ohio Valley, Appalachian Spine and the Northeast through midweek. At the same time a separate system will quickly organize across the Lower Mississippi Valley by late Tuesday, which will bring widespread rain Texas to the Mid-Atlantic and Southeast. Locally as much as a few inches of rain will be possible across these locations and as a result there may be some runoff concerns and possible flooding. This storm system will be lifting northeast across the Tennessee Valley and Mid-Atlantic region through Wednesday, and ultimately this will bring widespread precipitation to areas of the Ohio Valley, Mid-Atlantic and Northeast through late Wednesday. A stark thermal boundary will set up as warm Gulf air lifts northward into the southern states and meets the Arctic airmass over the central U.S. A narrow swath of mixed precipitation will be possible from Oklahoma to Maryland as the system advances eastward Tuesday and Wednesday. Heavy snowfall can be expected north and west of the low track and areas of the northern Mid-Atlantic region and interior Northeast will see the heaviest snowfall with some areas seeing as much as 6 to 12 inches. Farther south, there will be plenty of shower and some thunderstorm activity for the Southeast and spread out across the Gulf Coast states. Campbell/Orrison Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php