For those enjoying the tranquility of light winds and dry conditions in Honolulu, savor the moment as changes are coming. According to the National Weather Service in Honolulu, we can expect the light winds to persist for a couple more days before strengthened trades kick up, leading to a wetter weekend. Forecasters are predicting an upsurge in showers beginning on Friday, potentially ushering in heavy downpours, particularly over the island's windward side.
Currently, the serene weather owes its presence to a slow-moving complex low situated some 1300 miles northwest of Kauai, which is keeping the local pressure gradient relaxed. This has resulted in lighter winds, fostering a pattern of sea breezes by day and land breezes by night. However, the same system has allowed for "a slight diurnal increase in low cloud cover over waters E of the islands," with a few minor showers spotted east of Maui and the Big Island. Despite the calm, an area of higher-than-usual cloud cover is expected to pass over this afternoon and tonight, as per the National Weather Service.
We're on the cusp of a changeover with surface high pressure projected to build north of the islands from Friday into early next week. This development signals those strengthened trade winds that will sweep across the locale. While the National Weather Service is laced with potential for heavy showers and even snow over the summits of the Big Island, keep in mind that the latest ensemble prediction system guidance doesn't quite back the heavy precipitations. With the weather's whims, it's a forecast that, although not firmly consistent, leans heavily on the possibility of increased windward showers this weekend.
On the ocean, boaters and surfers will want to pay attention to evolving conditions. The current weak surface ridge to the north should hold for another several days, meaning coastlines will largely experience gentle diurnal breezes. But by the weekend, expect a shift to "fresh to strong easterly trades," as the ridge gains strength. Surf conditions on north and east-facing shores are set to see action with an uptick Wednesday due to an incoming swell, possibly hitting advisory levels for east-facing shores. Meanwhile, south facing shores will continue to ride on smaller swells, punctuated by a modest south swell expected this weekend, as reported by the National Weather Service.
No significant watches, warnings, or advisories are in place at the moment, but as Hawaii's residents and visitors know, the archipelago's weather is as dynamic as it is beautiful. Keeping abreast of the latest forecasts is always recommended—perhaps even more so in the coming days as we anticipate the arrival of stronger winds and a wetter embrace from the Pacific.
