Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 820 AM EDT Thu Aug 03 2017 Valid 00Z Fri Aug 04 2017 - 00Z Fri Aug 11 2017 The central Pacific features an upper low over the mid-latitudes well to the north of Hawai'i. Eventually this circulation is forecast to lift toward the Aleutians and be of minimal consequence to the Hawai`ian island chain. Closer to the region of interest, an upper low spins near the International Dateline while broad ridging extends to the east of Hawai`i. By the middle part of next week, there is a hint at further amplification in the mid-latitudes. However, only the GFS/GEFS mean continue to show this which appears to be somewhat outlying based on ensemble spaghetti member comparisons. At the surface, a strengthening in the dome of high pressure to the north will lead to an uptick in the trades by Friday and into the weekend. The strength of these winds may come down a bit by early next week as the surface pressure gradients begin to show some weakening. Regarding threats for precipitation, the better moisture fluxes should stay to the south of the islands based on the precipitable water forecast. However, given the moderate trades noted in the guidance, expect a potential increase in the coverage of windward showers from Friday into the weekend. Schichtel