A slightly unstable and somewhat wet trade wind flow will continue into Monday. An increasingly stable, moderate to breezy trade wind flow will develop Tuesday and Wednesday and will persist into next weekend.
Flight weather conditions will improve today as the upper level disturbance continues to drift eastward away from the Hawaiian Islands. Brief showers linger in the forecast mainly over windward and mountain areas of each island.
AIRMET Sierra is in effect for mountain obscuration for north through east sections of Oahu, the east section of Maui, and windward sections of the Big Island. Expect these conditions to generally persist through today.
Issued at 331 AM HST Sun May 17 2026 Moderate to locally fresh easterly trades have returned. An upper level-low that plagued the state has moved off to the northeast, increasing stability and decreasing showers.
A small, medium-period north northwest (320-330 degree) swell will continue to decline through tonight, with surf along north- facing shores following suit. A medium-period north-northwest reinforcement may provide another small bump in surf along north- facing shores by early Monday morning, followed by another small reinforcing swell on Tuesday.
Surf along west-facing shores will remain nearly steady through the rest of the weekend as the northwest swell influence gradually declines, but a new, long-period south southwest swell fills in.
A mix of small, medium- to long-period south swells will maintain small surf along south-facing shores for the next several days. The long-period south-southwest swell described above will increase surf along south-facing shores through today. Additional small, medium- to long-period south swell reinforcements will arrive through midweek.
Moderate to fresh trades will maintain rough and choppy surf along east-facing shores for the next several days.
Tides will peak around 2.5 to 3.0 ft MLLW today. Minor overwash of low lying coastal areas will be possible during times of high tide.
None.
