Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 803 AM EDT Mon Sep 26 2016 Valid 00Z Tue Sep 27 2016 - 00Z Tue Oct 04 2016 Central Pacific high pressure ultimately settling to the northeast of the state will support moderate to brisk trades through the period. By early next week the location of the surface high may allow flow to acquire a little more of a southeasterly component. At least through late this week expect the majority of shower activity, generally on the lighter side of the spectrum, to favor windward terrain. Lowest precipitable water values near one inch should exist over the central/northwestern islands around Tuesday. Guidance continues to signal some increase in rainfall during the weekend, as 1.50-1.75 inch and perhaps locally greater PWATs reach the area. 00z/06z GFS PWATs lie between the lower values in the 00z ECMWF and higher values in the 12z/25 ECMWF. There are still indications that a diffuse weakness aloft may evolve west of the islands to aid in bringing moisture from lower latitudes. Rausch