Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 804 AM EDT Sun Jul 08 2018 Valid 00Z Mon Jul 09 2018 - 00Z Mon Jul 16 2018 A broad mid/upper-level weakness crossing Hawaii today will continue to gradually drift westward over the next few days. Upper-level heights are expected to gradually rise in the wake of the weakness, as upper ridging builds across the islands. Expect windward shower activity to decrease slightly over the next few days as subsidence increases in association with the ridge. Surface high pressure will remain anchored well north of the state, keeping 15-25 kt low-level easterlies in place through the week. There may be a slight weakening of the trades by midweek, with an increase once again by later in the week as the pressure gradient tightens a bit. Ryan