Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 838 AM EDT Fri Jul 22 2016 Valid 00Z Sat Jul 23 2016 - 00Z Sat Jul 30 2016 According to the Central Pacific Hurricane Center's latest bulletin, maximum winds for Tropical Storm Darby remain to the north northeast of the center, which is currently forecast to track just northeast of the islands on Saturday into Sunday. According to the WPC ecmwf ensemble 850 mb vorticity and 850/700 mb rh probabilities, Hawaii does appear to be within a reasonable envelope to experience the effects of Darby although one must take into account where the highest winds may occur, which presently would be to the northeast of the state, but that can obviously change. While concern about wind speed is just one factor, rainfall is another and the most recent gfs forecast of precipitable water continues to show pw amounts near 1.25 inches at present forecast to rise from east to west starting Saturday morning to near 2 inches on the Big Island by 18z Saturday to a maximum near 2.25 inches by 06z Sunday and the 2 inch contour spreads across the other islands through 12z Monday. Darby's influence on Hawaii will diminish on Tuesday as the system moves north of the islands. Kocin