Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 315 PM EDT Thu May 16 2019 Valid 12Z Mon May 20 2019 - 12Z Fri May 24 2019 ...Guidance/Predictability Assessment... The WPC Alaskan medium range product suite was mainly derived from a blend of quite capatable GEFS/ECMWF ensemble means days 4-8. Manual adjustments were applied to add depth to offshore lows with favorable support to offset the blending process, albeit with uncertainty consideration. Deterministic detail from the GFS/ECMWF was only injected very early in the forecast period due to quickly increasing forecast variance and run to run model continuity issues. ...Weather Highlights and Hazards... Warming upper ridging should persist over much of mainland Alaska next week. Underneath, mid-upper level troughing and unsettled weather centered from the Bering Sea into the Gulf of Alaska early next week will increasingly refocus and amplify to the south of the Aleutians mid-later next week. This supports potential for deepening lows that would mainly offer maritime threats. Otherwise, expect a period with relatively benign weather for much of the state with limited weather hazard risks. 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 No significant hazards are expected over Alaska during this forecast period. 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