Honolulu is bracing for a shift in weather patterns, with a mix of land and sea breezes expected to give way to strengthening trades by Friday, as reported by the National Weather Service in a recent forecast obtained by NWS Honolulu. Residents and tourists should prepare for convective showers and possible thunderstorms tonight through Friday, with a more typical trade wind pattern favoring windward and mauka areas likely to resume over the weekend into early next week.
The weather shift is being driven by a weakening ridge north of the islands as a cold front inches closer from the northwest, this transition, prompted by an upcoming front stagnating northwest of Kauai, is likely to produce daytime sea breezes and overnight land breezes over the western islands while moderate east-southeasterly trades prevail to the east. Meanwhile, an upper level trough advancing across the state is set to trigger heavier showers, particularly during the afternoon and evening hours, and isolated thunderstorms as conditions ripen with cooler air aloft and increased moisture, as per the National Weather Service.
In terms of aviation, the moderate easterly trades expected to give pilots a wide berth, are slated to veer, which may result in cloud cover and showers, most notably to windward and mauka areas; however, general VFR conditions are anticipated today before a potential for widespread MVFR conditions on Thursday ensues. Adding a note of caution for flyers, despite the pause in the eruption of Kilauea, ongoing degassing could add a layer to the atmospheric palette, producing some hazy conditions across the islands, albeit not significant enough to warrant a mention in current Terminal Aerodrome Forecasts (TAFs).
For mariners, the seas are stirred differently, with trades dialing down and taking an easterly direction due to the approaching front, meanwhile, the anticipation of heavy showers and thunder threats will peak around Kauai and Oahu late tonight, spreading across the islands by Thursday and then receding as the week winds down. As for surfers, conditions on north and west facing shores are ebbing as swells subside, but they can expect a fresh swell to carry in higher waves potentially reaching advisory levels later in the week, while south facing shores will enjoy a sedate dance of overlapping swells through the week with an upsurge anticipated by next Tuesday.
