Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 531 PM EST Mon Nov 30 2020 Valid 12Z Fri Dec 04 2020 - 12Z Tue Dec 08 2020 ...Stormy Gulf of Alaska offers a heavy precipitation and high wind threat for southern and southeast Alaska.... ...Guidance and Uncertainty Assessment... Model forecast spread and run to run continuity remains less then stellar, so system details remain more suspect than usual. GEFS/ECMWF ensemble means lack details, albeit being more consistent with uncertainties. Accordingly, the WPC Alaskan medium range product suite was primarily derived from the mainly compatible 12 UTC GEFS/ECMWF ensemble means and the 19 UTC National Blend of Models, with only limited additional input from the 12 UTC GFS/ECMWF. This solution was collaborated with local Alaskan offices. ...Weather/Hazards Highlights... An overall more benign weather pattern settles into much of the North Slope and the Interior heading into the weekend. Underneath, a lead Pacific system lifting up through the eastern Gulf of Alaska Friday into the weekend offers less than ideal model forecast spread, but does show potential to focus heavy precipitation and high winds from a stormy Gulf into southern/southeast Alaska. A subsequent deeper low with more amplified upper trough/low support has an emerging guidance threat signal for additional maritime disruption and heavy precipitation/high winds across the Gulf and onshore back into southern and southeast Alaska later weekend into early next week. Schichtel Hazards: - Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Sun-Mon, Dec 6-Dec 7. - High winds across portions of the Alaska Panhandle and mainland Alaska, Sun-Mon, Dec 6-Dec 7. 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