Alaska Extended Forecast Discussion NWS Weather Prediction Center College Park MD 254 PM EDT Sat Mar 30 2019 Valid 12Z Wed Apr 03 2019 - 12Z Sun Apr 07 2019 Models and ensembles reasonably agree that a closed upper high/ridge will split with a main portion set to slowly retreat from mainland Alaska northwestward to northeastern Russia over the next week. This will allow ample arctic troughing and height falls dig southward through the cooling/unsettled but moisture limited Interior. Guidance has been inconsistent with the handling of this energy conduit. The WPC product suite was primarily derived from a composite blend of the compatable 12 UTC GEFS mean and the 00 UTC ECMWF ensemble mean. This solution is between recent ECMWF solutions that cut more troughing underneath the closed high and GFS runs that become eastward displaced over time. These are characteristc biases of both models. Underneath, this pattern will coincide with a focus of mid-upper level mean troughing along and south of 50N, holding a main Pacific storm track south of Alaska even the Gulf of AK for much of next week. The potential phasing of uncertain Arctic trough energies from the interior and Pacific system energies underneath could lead to more northward deepened low motions back up into the Gulf of Alaska by next weekend. Precipitation will be mainly limited to parts of the Aleutians and increasingly over the Panhandle and into southern coastal Alaska with onshore flow ahead of the potential system to threaten the Gulf of Alaska by next weekend. Schichtel Bullet points from the WPC Days 3-7 Hazards chart can be found 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