Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 349 AM EDT Mon Sep 15 2025 Valid 00Z Tue 16 Sep 2025 - 00Z Tue 23 Sep 2025 Drier than normal trade winds prevail through the week under persistent upper ridging. A tropical wave passes to the south Wednesday night with some enhanced rain potential for the windward portions of the Big Island. Otherwise, expect only some windward showers daily with little dry/drought relief expected this week. Jackson