Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 416 PM EDT Mon Sep 23 2019 Valid 12Z Fri Sep 27 2019 - 12Z Tue Oct 01 2019 Through the course the extended range the synoptic pattern will become increasingly amplified. A significant upper-level ridge will be building toward southern Alaska, which will in turn aid in the amplification of the longwave trough over the Bering Sea/North Pacific Ocean. Brisk low level winds will be transporting PW values of 0.75 to 1.25 inches into southwest/southern Alaska from a cutoff low in the central Pacific Ocean. Scattered to widespread precipitation will spread from the Aleutians northward to southern Mainland this weekend and shifting toward the Southeast by early next week. The initial blend for this package began with an equal blend of the 00Z CMC/ECWMF/UKMET, 00/06Z GFS and the 00Z ensemble transitioning to 40% EC/GFS 60% means by the end of the period. This helped reduce some of the timing issues with the cut-off low/precipitation. Campbell 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