Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 600 PM EDT Fri Jun 11 2021 Valid 12Z Tue Jun 15 2021 - 12Z Sat Jun 19 2021 ...Guidance/Predictability Evaluation... The WPC Alaskan medium range product suite was primarily derived from a blend of reasonably well clustered guidance of the 12 UTC GFS/ECMWF, 12 UTC GEFS/ECMWF ensemble means and the 19 UTC National Blend of Models Day 4/Tuesday. Excluded deterministic models from the composite days 5-8 due to increased variability and continuity issues with embedded systems compared to yesterday, lowering forecast confidence. Manually adjustments were applied mainly to offshore lows to maintain strength consistent with predictability and upper support to offset weakening inherent to the blending process. ...Weather/Threats Highlights... Lingering upper troughing from western to northern Alaska will support organized precipitation next week, albeit with minimal activity farther inland under a building/warming Interior upper ridge. Meanwhile, an active southern branch will progress near/just south of the Aleutians and a series of complex/uncertain lows and frontal systems will focus unsettled weather over the region and downstream across the Gulf of Alaska. Schichtel Hazards: No significant hazards are expected over Alaska during this forecast period. 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