![]() ![]() A thunderstorm or two could pop on the Big Island slopes this afternoon as well. The airmass will remain unstable due to troughing aloft, resulting in a more showery trade wind pattern, particularly for windward areas. High pressure northeast of the state will keep moderate to breezy trade winds in place during the next 24 hours. Additional opportunities remain for periods of enhanced showers in next week's weather forecast picture. Confidence is only moderate that increasing shower trends will be noticeable in our island trade wind weather pattern. How much shower activity will highly depend upon the strength of this upper level feature. ![]() The longer range forecast continues to show subtle changes towards increasing shower trends from Friday night through this weekend as a weak upper low/trough forms just north of the state. Brief trade wind showers will favor windward and mountain areas mainly during the overnight to early morning hours. This ridge aloft will produce stronger subsidence (downward moving air), and strengthen (lower) the trade wind temperature inversion heights into the 5,000 to 7,000 foot range across the region. Isolated thunderstorms will linger mainly over Kauai through tonight, and over the Big Island slopes in the afternoon hours.Ī weak high pressure ridge will build over the island chain from Wednesday into Friday. In the short term, this upper low will continue to enhance trade wind shower activity with decreasing chances for heavy showers and thunderstorms through tonight. These trends follow the typical diurnal cycle of peak rainfall amounts during the early morning hours under the unstable influence of an upper level low near Kauai. Shower activity has trended upward across the Hawaii region this morning as shown on the latest local radar and satellite imagery. Easterly trade winds will continue to blow across the region through much of next week. Increasing shower trends return by this weekend as another weak upper low forms just north of the state. Expect shower coverage to slowly decrease through the day with typical trade wind weather expected from Wednesday into Friday. Detailed ForecastĪ weakening upper low near Kauai will keep wet easterly trade winds in the forecast into Wednesday morning with locally heavy showers possible and isolated afternoon thunderstorms over the Big Island. Isolated showers in the evening, then scattered showers after midnight. Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 77 to 84 near the shore to around 65 near 5000 feet. Numerous showers in the morning, then scattered showers in the afternoon. Southeast winds 10 to 20 mph shifting to the east up to 20 mph after midnight. Lows 64 to 70 near the shore to around 51 near 5000 feet. Highs 75 to 82 near the shore to around 62 near 5000 feet. ![]()
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