Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 611 PM EST Sun Nov 29 2020 Valid 12Z Thu Dec 03 2020 - 12Z Mon Dec 07 2020 ...Storm systems are expected to lie over and south of Alaska during the next week... A blocky pattern characterized by ridging over Saskatchewan will keep troughing and shortwave energy moving through portions of the Alaska region over the next week with a coupe weaker low pressure systems mainly over the open waters of the Gulf of Alaska this week. However by this weekend a much stronger to significant weather system could approach portions of the mainland. Forecast guidance shows relatively good agreement in the synoptic scale but as usual there are considerable progression/timing issues that develop with individual storm systems particularly later in the forecast period. As such, the WPC blend consisted of a deterministic beginning using the 12Z ECMWF/GFS/CMC followed by increasing weight of the ECENS/NAEFS means which resulted in a blend that shows the latest model trends but maintains some continuity given the uncertainty discussed above. Much of the region will continue to experience above normal to much above normal temperatures for highs and lows with some days seeing anomalies of 20-30F across the interior areas. Expect the best potential for below normal temperatures over the west/southwest part of the mainland and through the Peninsula/Aleutians, in an area of persistent mid-level troughing into mid-week. By late in the weekend, if the storm system lifts closer to the coast, then widespread precipitation and generally unsettled weather could result in more normal to below normal temperatures by day 8. Roth/Taylor 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