Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 831 AM EDT Thu Sep 19 2019 Valid 00Z Fri Sep 20 2019 - 00Z Fri Sep 27 2019 Tradewinds will steadily increase as upper-level ridging moves through the region. An upper low is expected to move in from the west underneath an upper high in the mid-latitudes. Additionally, with an increase in moisture as a couple of tropical disturbances pass near the islands to the south with result in increased windward rainfall activity. There may be brief periods of heavy showers. Campbell