Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 404 PM EDT Tue Oct 23 2018 Valid 12Z Sat Oct 27 2018 - 12Z Wed Oct 31 2018 ...Heavy precipitation to continue across portions of southern/southeastern Alaska... Multiple low pressure systems will be tracking through the Gulf of Alaska over the course of several days; which will keep southern and southeast portions of the state favorable for multiple rounds of precipitation that may be heavy at times. Cooler air is also forecast to make its way southward as the relatively compact vortex north of Alaska gradually breaks down, allowing upper-level flow off the Arctic to play more of a role in weather for Alaska. Model guidance diverges from decent agreement beyond days 4 and 5 as it struggles with the evolution of the low south of the Aleutian Chain/north-central Pacific. This trend has persisted from the previous runs. In an effort to maintain a sense of continuity, the model blend of choice initialized with 70% ECWMF/GFS and 30% of the EC ens/GEFS/NAEFS and ending closer to 40%/60% by day 8. Campbell WPC medium range Alaskan products including 500mb, surface fronts/pressures progs and sensible weather grids can be found at: http://www.wpc.ncep.noaa.gov/alaska/ak_5dayfcst500_wbg.gif http://www.wpc.ncep.noaa.gov/alaska/akmedr.shtml http://www.wpc.ncep.noaa.gov/alaska/ak_5km_gridsbody.html