Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 648 PM EDT Tue Mar 31 2020 Valid 12Z Sat Apr 04 2020 - 12Z Wed Apr 08 2020 ...A Stormy Pattern for Alaska... ...Guidance/Predictability Assessment... The WPC Alaskan medium range product suite was primarily derived from a composite blend of reasonably well clustered guidance from the 12 UTC GFS/ECMWF and 12 UTC GEFS/NAEFS/ECMWF ensemble means along with the 19 UTC National Blend of Models. Forecast spread has improved through medium range time scales, bolstering forecast confidence. This forecast strategy has been collaborated with Alaskan offices and maintains good WPC continuity in an active and stormy weather pattern. ...Weather/Threats Highlights... Dynamic mid-upper level trough/jet progression northeastward from the northern Pacific through the Bering Sea will support a well developed surface low/frontal system. This storm presents a maritime threat Saturday with hazardous coastal conditions including high winds possible into western/northwestern Alaska. Anomalous stormy weather including heavy snows will translate inland into the Interior and North Slope over the weekend and in addition act to cool anticedent much warmer than normal temperatures. The intrusion of Arctic stream energies may lead to upper closed low formation by Monday in an unsettled/cooling pattern for the Interior. Subsequent digging and energy transference may support well organized low/system formation over the northern and eastern Gulf of Alaska early-mid next week would offer a maritime threat along with a weather/precipitation threat for the southern/southeastern Alaskan tier. Meanwhile well upstream, there is a growing guidance signal in support for the gradual approach of amplified mid-upper level closed low/trough and deepened surface system over the north Pacific toward the western Aleutians next midweek. 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 Hazards: - High winds across portions of mainland Alaska, Fri-Sat, Apr 3-Apr 4. - Much above normal temperatures across portions of mainland Alaska, Fri-Sat, Apr 3-Apr 4. 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