Trade winds are set to maintain their grip on the weather across the Hawaiian Islands, ensuring the continuation of stable and breezy conditions through Wednesday. According to the National Weather Service (NWS) - Honolulu's latest forecast, residents can expect "fairly stable low clouds" riding those persistent easterly trades, with passing showers most likely to affect windward and mountain areas.
The NWS further notes that an "upper level ridge will produce a fairly stable subsidence across the Hawaii Region," capping the shower activity by maintaining inversion heights between 5,500 to 6,500 feet. Despite this, a subtropical jet stream could slightly elevate the visual drama of our skies, with high level ice crystal cirrus clouds set to "enhance sunrise and sunset colors," particularly across western parts of the state. Shower activity may increase subtly later tonight through early Sunday morning due to a weak upper level trough passing over the islands, but the ridge is expected to quickly reassert itself, bringing a return to drier weather as the week progresses.
For aviation interests, the continued strength of the high pressure ridge means more of the same—expect stable and breezy easterly trades to persist. The NWS warns pilots of "moderate low-level turbulence over and downwind of island terrain" with the AIRMET Tango remaining in effect, projected to last into the early part of next week.
As for those taking to the seas, all Hawaiian waters are under a Small Craft Advisory until 6 AM HST Monday. Mariners should prepare to adjust their sails to account for the amplification of "moderate trade winds" due to a tight pressure gradient, the NWS cautions. Yet even as the high weakens and shifts east by midweek, winds in the "notoriously winder" eastern island bays and channels are forecasted to maintain their momentum. Meanwhile, surfers can look forward to swells that are predicted to raise south-facing shore surf heights to near summertime averages by Wednesday.
On land, the dry spell is leading to near critical fire weather conditions in leeward areas, with "minimum relative humidity at lower leeward elevations likely falling at or below 45 percent each afternoon," the NWS reports. While this is cause for vigilance, no official watches or warnings are forthcoming since the Keetch Byram Drought Index remains below critical thresholds at this time. Those making plans for outdoor activities in affected areas should stay informed of the latest predictions and advisories.
