Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 228 PM EST Fri Jan 26 2018 Valid 00Z Sat Jan 27 2018 - 00Z Mon Jan 29 2018 ...A new storm will arrive this weekend across the Pacific Northwest bringing additional heavy rain and snow... ...Heavy rains and possible flash flooding will impact parts of the Gulf Coast states... ...Briefly milder temperatures will arrive across the East as much colder temperatures filter down across the Midwest... High pressure initially along the Eastern Seaboard will advance east and offshore this weekend which will allow for warmer southerly winds to return across the Eastern U.S. out ahead of a cold front dropping southeast across the Midwest. High temperatures will be as much as 10 to 15 degrees above normal and will range from the 40s across parts of the Northeast, to the 50s over most of the Mid-Atlantic region, and then well into the 60s over the Southeast. Florida will be the warmest with temperatures well into the 70s. The warmer weather across the East will be short-lived though as the aforementioned cold front over the Midwest arrives along the Atlantic Seaboard by Sunday. Increasing clouds and a good threat of rain can be expected with the cold front which will be aided by multiple waves of low pressure running up along the front across the Southeast. In fact, heavy rainfall is likely across parts of the Gulf Coast states on Saturday and Sunday in association with the front and the attendant waves of low pressure. Rainfall amounts of as much as 2 to 4 inches with locally heavier amounts can be expected, and as a result, some potential for flash flooding does exist. Colder temperatures behind the front will filter across the East by early next week. Meanwhile, a theme of unsettled weather will generally continue for the West Coast, Great Basin and Intermountain region this weekend as the next in a series of storm systems arrives. The biggest impacts will be to the Pacific Northwest and the northern Rockies where heavy rain for the lower elevations, including the coastal ranges, can be expected. Meanwhile, heavy snowfall with additional amounts of as much as 1 to 2 feet can be expected for the higher terrain and especially the Cascades and favored terrain of the northern Rockies including the Sawtooth, Bitterroots and Tetons. Temperatures will generally be near or above normal given the influx of milder Pacific air across most of the West. The warmest temperatures though will again be found down across the Desert Southwest where much drier conditions and plenty of sun will allow temperatures to reach as high as the low to mid 80s by Sunday and Monday. Orrison Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php