Alaska Extended Forecast Discussion National Weather Service College Park MD 601 PM EDT Sat Sep 13 2025 Valid 12Z Wed 17 Sep 2025 - 12Z Sun 21 Sep 2025 ...Multi-day SouthCentral to Southeast Alaska Heavy Rain/Flooding Threat Next Week... ...Guidance Evaluation/Preferences... Model and ensemble solutions seem reasonably well clustered through medium-range time scales, bolstering confidence in the forecast of quite the energetic and stormy pattern with overall above normal predictablity. Favor a composite blend of the 12 UTC GFS/ECMWF/Canadian and GEFS/ECMWF/Canadian ensemble means to mitigate smaller scale embedded system differences consistent with individual predictability to help WPC product continuity. ...Weather/Hazards Highlights... Expect a continued series of deepened low pressure systems mid- later next week into next weekend to bring high winds across the Aleutians/Southern Bering Sea to then moderately impact Southwest Alaska and the Alaskan Peninsula. Guidance signals are growing in support for the deepest moisture plumes to focus repeat periods of moderate to heavy rainfall and high winds from Kodiak Island to especially the Kenai Peninsula/SouthCentral Alaska and Southeast Alaska. More details of collaborated threats are linked below including for our WPC Hazards Outlook product. 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