Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 606 PM EDT Wed Mar 26 2025 Valid 12Z Sun 30 Mar 2025 - 12Z Thu 03 Apr 2025 ...North Slope high wind and blowing snow threat Sunday into Tuesday, with snowy flow from western Alaska to the Interior... ...Guidance/Predictability Assessment... The 12 UTC cycle guidance solutions remain quite well clustered across and near Alaska Sunday-Tuesday. A GFS/ECMWF/UKMET/Canadian model blend again serves as a solid and detailed forecast basis. While the overall pattern evolution seems reasonably well defined overall through longer time frames, increasing system timing spread portends closer to average predictability. Opted to switch to a blend of GEFS/ECMWF/Canadian ensemble means solutions to maintain best WPC product continuity amid growing uncertainty. ...Weather/Hazards Highlights... An amplified upper trough with rotating surface lows will encompass much of the Gulf of Alaska this weekend into early next week. Most rainfall will hold offshore, but light to terrain enhanced moderate activity will wrap into southern/southeastern Alaska. Expect some enhanced flow on the backside of these lows from the eastern Aleutians and the Alaska Peninsula to the Gulf of Alaska. Meanwhile, a strong upper ridge over the Aleutians and Bering Sea will hold into the weekend. Modest upper troughing to the lee of the ridge in the Interior may support some local snow. Upstream, a dynamic upper trough set to exit eastern Asia and developing surface low/frontal system will lift robustly northeastward on the western periphery of the aforementioned upper ridge and then slam through the northern portion of ridge to impact western through northern and Interior Alaska into early next week. This is expected to support a high wind and blowing snow threat later Sunday into Monday/Tuesday across Northwest Alaska and the North Slope. Flow underneath the feature into western Alaska and the Interior is expected to support periods with organized moderate to locally terrain enhanced snows/winds. Additional system energies in this stream flow remain less certain with organizational details, but still seem likely to subsequently work within this developing system track on the heels of the lead system through next midweek. Renewed lead upper energies over the Interior in this pattern dig southward over the cooling southern mainland to the Gulf of Alaska next Wednesday and Thursday to spur additional moderate low/frontal genesis. 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