The National Weather Service in Honolulu reports that strengthening trade winds will lead to increased shower activity across the Hawaiian Islands this Friday, primarily affecting windward areas. This weather shift is attributed to a passing moisture band, with both wind speeds and precipitation levels expected to decrease by Saturday.
A surface low-pressure system is expected to develop northwest of the islands on Sunday and move southward, shifting winds to the southeast. This transition will likely result in increased cloud cover, higher precipitation chances, and possible thunderstorms. Although easterly winds are forecast to strengthen on Monday, unsettled weather may continue through Wednesday, while a ridge aloft maintains relative stability to limit total rainfall accumulation.
According to the NWS, aviators can expect continued showers and increasing easterly trade winds through Friday. Precipitation is likely to increase as a moisture band passes, followed by drier conditions on Saturday. A period of significant rainfall is forecast to begin Sunday and may continue through the latter part of next week.
High pressure north of the state is creating moderate to strong easterly trade winds. A Small Craft Advisory has been extended due to a northerly swell expected later today. By Sunday evening, winds may reach near-gale force, resulting in rougher sea conditions, high seas, and heavy rain through early next week. Additionally, a Coastal Flood Statement is in effect through the weekend for minor flooding, particularly along north-facing shores.
A Small Craft Advisory is in effect until 6 a.m. HST Saturday for maritime regions ranging from Kauai Northwest Waters to Big Island Southeast Waters. This advisory indicates rough sea conditions, and mariners in these zones are expected to exercise caution.
