Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 313 PM EDT Sun Sep 01 2019 Valid 12Z Thu Sep 05 2019 - 12Z Mon Sep 09 2019 There remains good guidance signal into later next week for organized low system development to mainly effect northwestern Alaska and maritime interests over the northern Bering Sea/Bering Strait. A blend of the quite well clustered and reasonable 12 UTC GFS and ECMWF was used in this period of above average forecast confidence. Upper trough amplifications back into the Aleutians and southern Bering Sea then AKpen/Southwest AK still has support for a pattern favorable for additional organized low system developments and widespread heavy weather/rainfall potential from late week into early next week along with lead southern stream low energies to lift up into the southeastern Gulf of Alaska. A composite blend of the best clustered ECMWF and GEFS/ECMWF ensembles still seems reasonable in this period of near average predictability. Schichtel Additional 3-7 Day Hazard information can be found on the WPC medium range hazards 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