Marine Weather and Tide Forecast for Maalaea, HI

SHORT TERM UPDATE
Issued at 820 AM HST Fri Apr 10 2026

Morning satellite imagery shows an upper level shortwave rotating along the base of an upper level trough near Kauai and Oahu. While the strongest forcing is starting to lift north of the state, there is enough instability to maintain a line of moderate to locally heavy showers that is slowly moving eastward over leeward Oahu and the north shore at press time. Even though forcing aloft will gradually decrease today, there will be ample moisture and sufficient instability to produce heavy showers and a flood threat, with the highest chances for impactful rainfall on Oahu through the day and on Maui County this afternoon. The flood threat will steadily decrease tonight, though we cannot rule out heavy rainfall on Maui County and Big Island.

PREV DISCUSSION
Issued at 438 AM HST Thu Apr 10 2026

Latest satellite imagery shows a low 500 sm northwest of Kauai early this morning with south to north orientated front just west of Kauai. A broad cloud shield remains over the the state. Radar light to moderate showers blanketed across the state with heavier showers building over Kauai early this morning. High resolution model guidance shows the frontal band moving east across the state today shifting the chances of heavier showers across Oahu later this morning and afternoon before moving onwards to Maui County tonight. Steady light to moderate showers will continue along the southeast Big Island. Thus the Flood Watch remains in effect for the state through this afternoon. The High Wind Warning (HWW) for windier areas of Kauai has been canceled as southerly winds eased and shifted more westerly. Strong southerly winds remain over Oahu which could still produce downsloping winds in areas north and downwind of steep terrain. However, the HWW for these winder areas has been downgraded to a Wind Advisory as overall wind speeds have weakened. As the front progresses towards the central island later this afternoon and evening wind speeds will continue to trend downward. Behind the front winds will ease to light and variable speeds. Big Island summits will continue to see advisory level winds through today before tapering off this afternoon thus the Wind Advisory remains in effect through this afternoon. The Winter Weather Advisory also remains in effect through this afternoon.

The low will become absorbed in a stronger, nearly stationary, low far northwest of the state Saturday. Remnant moisture lingering over the eastern half of the state will still produce some scattered showers but overall flooding threat will have decreased as low to mid level drier air filters in from the west to east across the state. An upper level shortwave is expected to dip southeastward Sunday, likely supporting another active weather period across the state that may extend through early next week.
Winds will remain light through much of next week as this larger low slowly weakens through the first half of next week before shift northeast during the second half of next week. Light winds and lingering moisture will allow for afternoon sea breezes building clouds and increase showers over interior areas. Land breezes will develop overnight providing some clearing. This pattern is expected to persist through much of next week as this low keeps the island chain cut off from tradewinds returning.

AVIATION
Issued at 820 AM HST Fri Apr 10 2026

Two main areas of showers were moving through the state this morning. The first, mainly impacting Oahu, will bring widespread MVFR with isolated IFR. This area will work east towards Maui County through the afternoon, bringing worsening conditions. The other is over Big Island, and MVFR is likely there through at least this morning. The first area described may get to Big Island late this afternoon.

AIRMET Sierra is in effect for mountain obscuration above 2000 ft for all islands.

AIRMET Tango remains in effect for moderate turbulence between FL180 and FL360 across the entire area, and for moderate turbulence below 9000 ft downwind of terrain for Oahu and Kauai.

AIRMET Zulu remains in effect for moderate icing between 140-FL200 for all areas.

MARINE
Issued at 438 AM HST Thu Apr 10 2026

As the low pressure system to the northwest further deepens, we will likely see a few strong to severe thunderstorms capable of producing waterspouts and damaging winds over the coastal waters.
Rough boating conditions are expected with elevated seas and strong to near gale force southerly winds. As such a Small Craft Advisory is in effect for all waters through at least 6PM.

Strong southerly winds are expected to slowly decrease west to east today. Surf along the southern shores is slowly declining.
The High Surf Advisory has been cancelled as surf has fallen below criteria.

Along north facing shores, the current northwest (320 degree)
swell is slowly decreasing and should dissipate to background levels on today. However a smaller short-period northwest swell generated by the aforementioned low will fill in tonight through early next week.

Surf along east facing shores could see an increase later this week due to the strengthening southeasterly winds especially for southeast exposures.

HFO WATCHES/WARNINGS/ADVISORIES
Flood Watch until 6 PM HST this evening for Big Island East-Big Island Interior-Big Island North-Big Island South-Big Island Southeast-Big Island Summits-Central Oahu-East Honolulu-Ewa Plain-Haleakala Summit-Honolulu Metro-Kahoolawe-Kauai East-Kauai Mountains-Kauai North-Kauai South-Kauai Southwest-Kipahulu- Kohala-Kona-Koolau Leeward-Koolau Windward-Lanai Leeward-Lanai Mauka-Lanai South-Lanai Windward-Maui Central Valley North-Maui Central Valley South-Maui Leeward West-Maui Windward West- Molokai Leeward South-Molokai North-Molokai Southeast-Molokai West-Molokai Windward-Niihau-Oahu North Shore-Olomana-South Haleakala-South Maui/Upcountry-Waianae Coast-Waianae Mountains- Windward Haleakala.

Wind Advisory until 6 PM HST this evening for Big Island Summits- Central Oahu-Koolau Leeward-Koolau Windward-Oahu North Shore- Olomana-Waianae Mountains.

Winter Weather Advisory until 6 PM HST this evening for Big Island Summits.

Small Craft Advisory until 6 PM HST this evening for Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters- Big Island Windward Waters-Kaiwi Channel-Kauai Channel-Kauai Leeward Waters-Kauai Northwest Waters-Kauai Windward Waters- Maalaea Bay-Maui County Leeward Waters-Maui County Windward Waters-Oahu Leeward Waters-Oahu Windward Waters-Pailolo Channel.