Alaska Extended Forecast Discussion National Weather Service College Park MD 758 PM EDT Thu Oct 9 2025 Valid 12Z Mon 13 Oct 2025 - 12Z Fri 17 Oct 2025 ...Series of potent storms offer Aleutians to western and southern Alaska high wind/wave and heavy rain threats... ...Guidance Evaluation and Preferences... A mean trough will be present through the extended period over the Bering Sea. Multiple deep, closed lows will lift northward while while several impulses of energy ejects from the flow into the Gulf of Alaska/Mainland. Guidance is above average on clustering on Day 4 however quickly returns to near average with the evolution of low at the beginning of the week. Spread increases by midweek and beyond, particularly across the Gulf of Alaska. Impulses and increase moisture within the flow will maintain the potential for wet and unsettled conditions on the southern part of the state. Maintained continuity by starting with a compromise of the CMC/EC/GFS; including the EC/GEFS means for Day 5 and then bumping up to a 50/50 deterministic to means ratio from forecast hour 180 and beyond. ...Weather/Hazards Highlights... An active pattern will support multiple days with locally enhanced winds and precipitation. A closed upper low/trough will support a main deep mean surface storm/low position over the Aleutians and Bering Sea late week through early next week that will offer a prolonged opportunity for periods of high winds/waves and wrapping rainfall. Approach and downstream undercutting energy and system/frontal progression across the Alaska Peninsula into the Gulf of Alaska should act to enhance lead inflow to fuel growing precipitation to spread across Kodiak Island and SouthCentral to Southeast Alaska Sunday into early next week with downstream translation. Additional deep low approach on the heels of this system will renew potential for scattered to widespread precipitation and strong winds for the southern tier of the state. Campbell 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