Alaska Extended Forecast Discussion National Weather Service College Park MD 602 PM EDT Thu Aug 28 2025 Valid 12Z Mon 01 Sep 2025 - 12Z Fri 05 Sep 2025 ...Labor Day Weekend Heavy Rain/Flooding/Wind Threats for Southwest/Western Alaska... ...Guidance Evaluation/Preferences... Favor a composite of the 12 UTC GFS/ECMWF/Canadian models and GEFS/ECMWF/Canadian ensemble means solutions that seem reasonably well clustered through medium-range time scales, bolstering forecast confidence in the protracted mid-larger scale pattern and associated threats. WPC product continuity is well maintained. ...Weather/Hazards Highlights... The next big weather maker in a recent series of impactful storms is slated to develop over the Bering Sea this weekend. This will initially affect the Aleutians by Saturday with heavy rain and strong winds, and then will affect western mainland Alaska going into Sunday and through Labor Day and persisting into early-mid next week. This will be accompanied by strong southerly flow that will advect long fetch deep atmospheric river moisture northward and bring periods of moderate to locally heavy rainfall from the Alaska Peninsula to Southwest/Western Alaska up to the western Brooks Range where enhanced snows are expected. Coastal flooding is also possible for areas near Bristol Bay and the Yukon Delta. The overall inland wind threat will be maximized up through Southwest/Western Alaska over the extended holiday weekend. Meanwhile, southeast Alaska should enjoy a pleasant week ahead overall as an upper ridge yields continued low rainfall chances/benign weather. Schichtel Additional 3-7 Day Hazard Information can be found on the WPC medium range hazards outlook 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