Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 418 PM EST Sat Feb 20 2021 Valid 12Z Wed Feb 24 2021 - 12Z Sun Feb 28 2021 ...Overview and Guidance/Uncertainty Assessment... The 12 UTC GFS/GEFS mean and 00 UTC ECMWF/ECMWF ensemble mean seem best clustered at medium range time scales. A composite solution is preferred to highlight the most predictable weather features. Leaned blend emphasis in favor of the ensemble means by days 7/8 consistent with growing model forecast spread. The WPC medium range product suite was primarily derived from these WPC blends along with the National Blend of Models in a pattern with near average forecast predictability/uncertainty. This solution maintains good WPC product continuity. ...Weather/Hazards Highlights... A series of deepening lows in an energetic Pacific stream will work across the Bering Sea/Aleutians all next week in an active pattern. This may favor a downstream warming trend across southwest Alaska and much of the Interior midweek into next weekend, but lingering upper troughing and flow underneath may inhibit warming over an unsettled North Slope and possibly the eastern Interior. A main storm track will focus precipitation and wind/waves to the Aleutians, the AKpen and southwest/western Alaska as they progress eastward, with energies to track into an unsettled Gulf of Alaska to support periodic heavier precipitation into southern and southeast Alaska. Schichtel 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