Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 808 AM EDT Sun Jun 25 2017 Valid 00Z Mon Jun 26 2017 - 00Z Mon Jul 03 2017 High pressure will persist over the eastern Pacific beyond midweek then by Friday-Sunday build westward and incorporate an approaching western-central Pacific high. This evolution will maintain trades through the period. Winds should be fairly strong the next few days. Around Friday-Saturday the trades may become a little less brisk as a weak surface trough crosses the state. This feature will be in response to an upper low which GFS/ECMWF runs over the past day or so have been bringing toward the area from the northeast and then tracking north of the islands. By Sunday trades should strengthen again as the surface trough passes to the west. Expect a decrease in shower activity, tending to focus over windward areas, once an upper level weakness drops southwestward away from the state Sunday-Monday. Guidance is consistent in showing precipitable water values dropping to the 1.00-1.25 inch range through midweek. One or more pockets of greater moisture are likely to reach the islands by Friday-Sunday bringing a potential for at least a modest increase of rainfall. Rausch