Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 344 PM EDT Fri Mar 15 2019 Valid 12Z Tue Mar 19 2019 - 12Z Sat Mar 23 2019 Expect periods of terrain and coastal convergence enhanced precipitation into the southern coast of the Mainland and to Southeast AK. Moist inflow will wrap around a series of deepened Gulf of AK surface lows under influence of ample mid-upper level troughing. Systems will tap an atmospheric river to produce daily totals averaging several inches with some locally favored 5-day totals of 10+ inches. The airmass quickly loses moisture content farther inland, but expect modest snows from southwest AK to the western/central Interior to northern AK as energy lifts in a channel between a Bering Sea mean mid-upper level trough/low and an Interior AK/western Canadian mid-upper level ridge. Relatively dry conditions are expected to persist for much of the east-central Interior under that ridge. Meanwhile, increasingly stormy maritime conditions for over the Bering Sea mid-late next week with deep surface low development. Unsettled weather should work steadily underneath through the Aleutians toward southwest/western AK late next week. Overall, the WPC Alaskan Days 4-8 product suite was mainly derived from the ECMWF ensemble mean that best maintain WPC continuity, with offshore lows further deepened considering favorable support aloft and pattern history. Schichtel Bullet points from the WPC Days 3-7 Hazards chart: https://www.wpc.ncep.noaa.gov/threats/threats.php - Heavy precipitation across portions of the Alaska Panhandle and southern mainland Alaska, Mon-Tue, Mar 18-Mar 19. - High winds across portions of the Alaska Panhandle and southern mainland Alaska, Mon, Mar 18. WPC medium range Alaskan products including 500mb, surface fronts/pressures progs and sensible weather grids can also be found at: https://www.wpc.ncep.noaa.gov/alaska/ak_5dayfcst500_wbg.gif https://www.wpc.ncep.noaa.gov/alaska/akmedr.shtml https://www.wpc.ncep.noaa.gov/alaska/ak_5km_gridsbody.html