The high pressure system north of Hawaii will slowly drift eastward as a low pressure system sets up north of the island chain by Friday. Moderate trade winds will continue a weakening trend producing hybrid trade wind and sea breeze wind flow each day lasting into early next week. Brief passing showers will drift into the islands on the easterly trade winds. Any showers will tend to favor windward mountain areas during the overnight to early morning hours. A more significant change to our weather pattern continues to evolve for early next week from Tuesday through Wednesday. Deeply unstable tropical moisture moving across the state will bring the potential for heavy rain and thunderstorms affecting all islands.
Scattered windward -SHRA possible today with trades AOB 15kts. VFR cigs/vis prevail through the period with very brief windows of MVFR with the aforementioned -SHRA through the afternoon.
No AIRMETS are in effect.
Easterly trade winds will be at gentle to moderate strength through Friday as surface low pressure far north of Hawaii weakens the local pressure gradient. Trades are expected to hold at current strength and shift out of the northeast as high pressure far northwest of Hawaii pushes to low eastward and carries a shallow band of showers over the island chain. The weaker trade winds should persist Monday, but uncertainty increases on Tuesday, hinging on the potential development of a low southwest of the islands.
A small, medium-period northwest swell will provide a small boost to surf along north-facing shores on Friday. A moderate, medium- period north-northwest swell will build late Saturday and peak around seasonal average on Sunday. As this swell declines on Monday, a long-period west-northwest swell will arrive, maintaining moderate surf through the middle of next week.
Small background level surf will prevail along south-facing shores through Friday. A small to moderate, south-southwesterly swell is expected to boost surf to around seasonal average this weekend into early next week.
Along east-facing shores, trade-wind swell will decrease today, though a small, medium-period northeast swell may maintain small surf through Saturday. Aside from wrapping north-northwest swell in exposed areas, east shore surf should remain below seasonal average much of next week.
None.
