Light winds, increasing humidity, and land and sea breeze conditions will persist through midweek as a series of fronts pass north of the state. Showers will remain brief and primarily over interior and leeward areas during the afternoons. Rainfall chances may increase by the weekend as an upper disturbance approaches the region.
Trades will continue to weaken over the coming days, resulting in sites seeing more of a land/sea breeze pattern, especially by the evening. In the meantime, showers lingering in the light ESE flow can still impact windward areas. Afternoon showers over island interiors are also possible. MVFR conditions are expected within showers, and VFR will prevail elsewhere.
AIRMET Sierra is in effect for N through E sections of Oahu due to lingering clouds and showers. This could be expanded to include other islands later today due to potential cloud and showers forming over island interiors.
Kilauea has recently erupted, prompting an initial SIGMET for volcanic ash under series Victor. The plume is estimated to be around 20kft, and will continue to grow in altitude. The ash plume is forecasted to move N-NE of the volcano, and will continue to be monitored for impacts near PHTO.
Issued at 339 AM HST Tue May 5 2026 The trades will ease and shift southeasterly at light to moderate levels today and tonight as an approaching front merges with a trough north of the island chain. The front will pass north of the area on Wednesday, bringing light and variable winds, with sea and land breezes present near the immediate coasts. A new high building northwest of the state will bring a return of light to moderate trades Thursday and Friday, with the trades strengthening to moderate and fresh levels over the weekend. Winds and seas are expected to remain below Small Craft Advisory thresholds through at least Friday.
A moderate medium-period northwest swell will gradually lower during the next couple of days. A new long period swell will build Wednesday night and give a nice boost to north and west shore surf Thursday and Friday, followed by a gradual decline over the weekend into early next week.
A series of overlapping south swells will keep steady small surf rolling into south facing shores during the next week.
Surf along east facing shores will remain below normal during the next 7 days due to the lack of strong trades over and upstream of the islands.
Ashfall Advisory until 8 PM HST this evening for Big Island East- Big Island Southeast.
