Alaska Extended Forecast Discussion National Weather Service College Park MD 630 PM EST Wed Nov 12 2025 Valid 12Z Sun 16 Nov 2025 - 12Z Thu 20 Nov 2025 ...Powerhouse Storm to Impact Aleutians/Bering/Southwest Alaska... ...Synoptic Overview... Wet, and unsettled pattern for mainly the maritime areas and the southern/southeast coastal tier. Rain and mountain snow will linger for southern Alaska Peninsula and Kodiak Island as the low moves further into the Gulf of Alaska. Potent storm lifting northward expected to yield high winds, impacting the Aleutians,the Bering Sea and Southwest Alaska. Scattered to widespread precipitation will primarily focus along the southern tier as well. ...Guidance Evaluation/Preferences... Much of the Interior and North Slope vicinity will be cooler with limited areas of precipitation on a mean upper trough. Periods of enhanced wind/waves along with precipitation is expected to reach the Gulf and focus along the southern coast and Southeast. A deep extratropical low with energy and moisture connection to current West Pacific Typhoon Fung-Wong looks to focus impacts into the Aleutians/southern Bering Sea and may affect Southwest Alaska and onward late weekend into early next week. Guidance has been persistent in maintaining a lot of spread with the evolution and track of this system however a constant has been that this storm will likely pack a punch wherever it ends up tracking. A majority of the forecast was based on the ECMWF/EC ensemble means for the extended period, with some inclusion of the UKMET/CMC/GFS very early on. ...Weather/Hazards Highlights... Periods of rain and mountain snow are likely for the southern coastal areas of the state into Saturday as an emerging Gulf of Alaska low enhances onshore flow, but it mainly appears to be moderate in intensity for the most part. Mean temperatures are generally expected to trend below average across much of the Interior and the North Slope over much the forecast period. A very stormy and unsettled weather pattern will likely impact the Aleutians and Bering Sea. A deep and powerful low pressure system is expected to move off eastern Siberia and become occluded into the western Bering Sea. A stronger and impactful extratropcial low tracking from the northwest Pacific is then slated to lift ahead of the western Bering Sea low up through the Aleutians into the Bering Sea. This latter deep system has some energy and long fetch moisture connections to current west-Pacific Typhoon Fung- Wong. This will likely result in strong winds, heavy rains, and high seas through the Aleutians/Bering Sea and could lead into later weekend to early next week impacts into Southwest Alaska along with subsequent unsettling downstream translation of system energies and moderate precipitation/winds through the Alaska Peninsula to the Gulf of Alaska and southern Alaska tier. 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