Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 736 AM EDT Sun Aug 30 2015 Valid 00Z Mon Aug 31 2015 - 00Z Mon Sep 07 2015 The 30/00Z model cycle offered no surprises with the current and near-future forecasts for Hawai'i and the central Pacific. Will refer you to the Central Pacific Hurricane Center (CPHC) for the most recent and pertinent weather information concerning the sensible weather associated and headlines with 'Kilo' and 'Ignacio'. Medium Range... The 30/00Z deterministic GFS/ECMWF and their ensembles were in good agreement until day 5 (4/12z) when mid-latitude north Pacific flow begins to interact with the Subtropics invof 160W longitude. Much of the spread is related to the nature and slow, eastward movement of a stationary boundary near the Dateline after day 5---and to what extent the flow will/will not incorporate some of 'Ignacio', and turn it northward and allow it to continue migrating westward. Believe the medium range solutions have correctly established the longitude of the slow-moving block from the Dateline eastward to 160W---but the presence of 'Kilo' and 'Ignacio' are providing some of the differences---and in a fashion---not much different from the global guidance 'migratory struggles' observed when Goni and Atsani were migrating towards the mid-latitude westerlies. These 'migratory struggles' do not pertain to a surface pressure field disconnect between solution---as was observed with the previous twin-cyclone scenario in the western Pacific (Goni and Atsani). And the differences are generated in the clearly faster mid-latitude GEFS/GFS solutions. Would suggest leaning closer to an ECENS/ECMWF solution beyond day 5 to allow the global guidance to 'reset' the downstream pattern between 30N and 45N latitude invof 160W. Vojtesak