Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 756 PM EDT Tue Mar 30 2021 Valid 12Z Sat Apr 03 2021 - 12Z Wed Apr 07 2021 ...Guidance/Uncertainty Assessment... The latest runs of the model guidance and the ensemble means agree on the big picture over the course of the extended period, however there is quite a bit of spread beyond initialization. This spread does lower the confidence on exactly timing, location and amplitude of the various features. The ECWMF continues to be near the fringe of being an outlier, especially in terms to amplitude. A multi-model and ensemble blend was preferred to help dampen the noise/spread, with a heftier lean toward the GFS and its mean. ...Weather/Hazards Highlights... Portions of the Interior may have cool, unsettled weather with possibly some locally enhanced snowfall Friday thanks to a lingering upper-level trough. Meanwhile to the south, an amplified upper trough dug over the eastern Gulf of Alaska will support a lingering precipitation focus into the Panhandle. Upstream, an unsettling northern Bering Sea system Friday will progress into the mainland by the weekend. This should support some threat of enhanced snows from western and southwestern Alaska into the central mainland. There is an additional, but uncertain, western Bering Sea system potential by early next week that could effect the Aleutians. These system energies may tend to dig to the lee of a mean upper ridge built up through the Aleutians. This pattern may favor periodic reinforcement of surface lows from the northern to eastern Gulf of Alaska that would offer a recurring threat for lead flow to fuel periods of moderate terrain enhancing precipitation for southeast Alaska. Campbell/Schichtel Hazards: - Heavy snow across portions of mainland Alaska, Fri-Sat, Apr 2-Apr 3. Additional 3-7 Day Hazard information can be found on the WPC medium range hazards chart at: https://www.wpc.ncep.noaa.gov/threats/threats.php 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