Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 830 AM EDT Tue Oct 04 2016 Valid 00Z Wed Oct 05 2016 - 00Z Wed Oct 12 2016 ...A Wet Short Term Pattern for Hawaii... High pressure now to the northeast of Hawaii will continue to supporting moderate island trades over the next couple of days. Precipitable water values upwards of 2" or 3-4 standard deviations above normal are in place over the Big Island where WFO Honolulu has issued a flash flood watch due to the potential for locally excessive rainfall, especially over favored terrain. A flood advisory has also been issued for Maui as per recent heavy rainfall and additional heavier rain threat. These threats may remain in place into Thursday. Meanwhile, Typhoon Chaba's track across the western Pacific has led to amplified downstream ridging aloft over the mid-latitudes of the west-central Pacific. Accordingly, this is setting up a pattern for strong southeastward shortwave trough digging to the lee of this ridge toward the Hawaiian Islands. This will allow an initial upper level circulation to the northwest of the state will be replaced by central Pacific energy that descends toward the islands, with this evolution potentially supporting a weak surface trough. Rainfall should trend lighter by the late week/weekend time frame as PWATs decrease to 1.25-1.50 inches and perhaps briefly lower. An elongating surface ridge near 30N latitude, containing one or more individual highs, will likely support a return to moderate to brisk trades and greater windward focus for any shower activity. Schichtel