Weakening trade winds will produce light rainfall over mainly windward areas tonight. Low pressure will develop north of the state on Wednesday, causing winds to shift out of the south and allowing sea breezes to produce a few interior showers in the afternoon. Deep southerly winds will draw tropical moisture over the portions of the island chain Wednesday night through at least Thursday, bringing some potential for flooding rainfall. The low will weaken several hundred miles northwest of Kauai Friday and Saturday then lift away on Sunday, though a few heavy showers may linger through the weekend under light winds. Light trade winds are expected to return early next week.
Light southeast winds expected through the forecast period due to a surface trough just west of Kauai County. Increasing SHRA and a few isolated TSTMs are possible through Thursday as the surface trough moves even closer. IFR/MVFR conds likely within heavier SHRA and TSTMs. VFR prevails elsewhere.
No AIRMETs are in effect.
Gentle to moderate south to southeast winds will continue over the next several days as a low pressure system develops north of Hawaii. Enhanced showers with the potential for a few thunderstorms are forecast for the western half of the state through Thursday. A surface trough will linger near the area through the weekend and early next week keeping potential for variable winds and unsettled weather.
South swell will maintain into next week with pulses of long period reinforcement arriving Thursday and Saturday. Surf will stay below advisory levels along south facing shores.
Small to moderate surf along north and west facing shores will continue through the rest of the week as swell energy is reinforced by the slowly moving surface low northwest of the Hawaiian Islands. A larger swell will arrive around Tuesday, bringing north and west shore surf to just below advisory thresholds. Surf along east facing shores will remain small as local winds remain fairly weak.
Flood Watch from 6 PM HST this evening through Thursday afternoon for Central Oahu-East Honolulu-Ewa Plain-Honolulu Metro-Kauai East-Kauai Mountains-Kauai North-Kauai South-Kauai Southwest-Koolau Leeward-Koolau Windward-Niihau-Oahu North Shore- Olomana-Waianae Coast-Waianae Mountains.
