Showers will continue for the entire day over Kauai and Oahu with the heaviest rain and greatest flooding potential over Oahu. LIght trades return at the end of the week.
Issued at 834 AM HST Sun Apr 12 2026
An unstable band of deep tropical moisture will move up from the south under an upper level disturbance. Weather conditions will destabilize today, producing widespread MVFR and isolated IFR conditions statewide with low clouds, showers and isolated thunderstorms from early this morning through early Monday morning. Oahu is expected to be the most likely to receive periodic heavy showers. Light land-sea breezes less than 10 kts will prevail across all sites.
AIRMET Sierra remains in effect for mountain obscuration above 1500 ft for Kauai and Oahu, as well as for IFR conditions at Molokai, Lanai, and Maui. These conditions are expected to remain today with the oncoming shower threat, with some relief expected later this evening as conditions dry out, however low clouds may remain due to light winds and lingering moisture.
Widespread cloud cover over the state today may also lead to moderate icing.
A surface trough will linger in the vicinity of the central islands into early next week, keeping moderate to fresh southeasterly winds to its east, and light and variable winds to its west. This weak surface boundary along with an upper level disturbance moving into the region brings another round of showers and isolated thunderstorms today into Monday. As the surface trough lifts north and high pressure to the northeast begins to takes over at the surface, gentle to moderate easterly trades will gradually develop across the Hawaiian coastal waters by the end of next week.
A moderate, short to medium-period north-northwest swell (340 degrees) generated by the formerly-gale force low north-northwest of the main Hawaiian islands arrives along north and west facing shores today. This will maintain small to moderate surf through the beginning of the week, followed by a decline in northwest swell energy for the rest of the week.
A medium-period south swell will continue to decline through Monday. By Tuesday, however, a new south swell will arrive, once again providing a boost to surf along south facing shores through mid week before gradually subsiding into the weekend.
Surf along east facing shores remains below seasonal average with lighter than average trade winds near and upstream of the islands forecast through next week.
Flood Watch through Monday afternoon for Hawaii.
