Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 354 PM EDT Sat Jun 22 2019 Valid 12Z Wed Jun 26 2019 - 12Z Sun Jun 30 2019 A relatively benign weather pattern will persist across Alaska during the medium range, with a persistent upper-level ridge axis extending from the North Pacific across western mainland Alaska north to the Arctic. Shortwave energy will traverse a mean upper trough centered across the western Bering Sea/western Aleutians, with a couple waves of low pressure will move through the mean trough, with energy splitting as it encounters the ridge, either deflecting north back into the mean Bering trough or east, well south of Alaska across the north Pacific. Meanwhile, on the eastern periphery of the upper ridge, weakening arctic cold fronts should move southward, bringing a return to near or slightly below average temperatures to the North Slope and eastern portions of the Interior, along with the potential for isolated to scattered showers. The WPC forecast was based on a blend of the GFS and ECMWF during days 4-5, with more weight placed on the GFS due to continued better run-to-run consistency relative to the ECMWF. Increasing weight was placed on ECENS and GEFS ensemble means from day 6 onward to account for increasing spread, including differences in how solutions handle the upper ridge and the track of low pressure systems traversing the mean upper trough. Ryan 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