Rest Of Today: Mostly sunny with isolated showers. Highs around 80 near the shore to 64 to 69 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Tonight: Cloudy. Numerous showers in the evening, then isolated showers after midnight. Lows 63 to 68 near the shore to around 53 at 4000 feet. Light winds. Chance of rain 50 percent.
Sunday: Cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs around 80 near the shore to 64 to 69 at 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.
Kona
Rest Of Today: Sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 79 to 85 near the shore to around 66 near 5000 feet. Northwest winds up to 10 mph. Chance of rain 40 percent.
Tonight: Mostly cloudy until early morning then becoming partly cloudy. Lows around 69 near the shore to around 52 near 5000 feet. Light winds.
ARTICLE CONTINUES BELOW AD
ARTICLE CONTINUES BELOW AD
Sunday: Mostly sunny. Isolated showers in the afternoon. Highs 79 to 85 near the shore to around 65 near 5000 feet. Northwest winds up to 10 mph. Chance of rain 20 percent.
Waimea
Rest Of Today: Mostly sunny with isolated showers. Highs around 79 near the shore to 68 to 74 near 3000 feet. East winds up to 10 mph. Chance of rain 20 percent.
Tonight: Mostly cloudy. Scattered showers until early morning. Lows around 65 near the shore to 53 to 60 near 3000 feet. East winds up to 10 mph in the evening becoming light. Chance of rain 40 percent.
Sunday: Mostly cloudy. Scattered showers in the afternoon. Highs around 79 near the shore to 69 to 74 near 3000 feet. East winds up to 10 mph. Chance of rain 50 percent.
Kohala
Rest Of Today: Mostly sunny with isolated showers. Highs around 79 near the shore to 68 to 74 near 3000 feet. East winds up to 10 mph. Chance of rain 20 percent.
ARTICLE CONTINUES BELOW AD
Tonight: Mostly cloudy. Scattered showers until early morning. Lows around 65 near the shore to 53 to 60 near 3000 feet. East winds up to 10 mph in the evening becoming light. Chance of rain 40 percent.
Sunday: Mostly cloudy. Scattered showers in the afternoon. Highs around 79 near the shore to 69 to 74 near 3000 feet. East winds up to 10 mph. Chance of rain 50 percent.
South Big Island
Rest Of Today: Sunny in the morning, then mostly cloudy with isolated showers in the afternoon. Highs around 82 near the shore to around 66 near 5000 feet. Southeast winds up to 15 mph. Chance of rain 20 percent.
Tonight: Partly cloudy. Lows around 69 near the shore to around 51 near 5000 feet. Northeast winds up to 10 mph.
Sunday: Mostly sunny. Isolated showers in the afternoon. Highs around 82 near the shore to around 66 near 5000 feet. East winds up to 15 mph. Chance of rain 20 percent.
Puna
ARTICLE CONTINUES BELOW AD
Rest Of Today: Mostly sunny with isolated showers. Highs around 80 near the shore to 64 to 69 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Tonight: Cloudy. Numerous showers in the evening, then isolated showers after midnight. Lows 63 to 68 near the shore to around 53 at 4000 feet. Light winds. Chance of rain 50 percent.
Sunday: Cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs around 80 near the shore to 64 to 69 at 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.
Waikoloa
Rest Of Today: Mostly sunny. Highs around 84 near the shore to around 67 above 4000 feet. Northwest winds up to 10 mph.
Tonight: Partly cloudy. Isolated showers until early morning. Lows around 70 near the shore to 49 to 55 above 4000 feet. Southeast winds up to 10 mph. Chance of rain 20 percent.
Sunday: Mostly sunny. Highs around 84 near the shore to around 67 above 4000 feet. Northwest winds up to 10 mph.
Detailed Forecast
Synopsis
A land and sea breeze weather pattern will develop over each island through Sunday as the trade winds weaken into the light to moderate range. A narrow upper level trough with embedded lows just over the region will produce brief periods of showers over the next several days. Trade winds will gradually strengthen next week as high pressure builds in across the region.
Discussion
Satellite imagery this morning shows a narrow upper level trough oriented from west to east over the Hawaii region. A subtropical jet stream is moving in from the west and will spread cirrus clouds into the state later today. A few upper lows are embedded within this upper trough that will keep lighter trade winds in the forecast this weekend, and produce brief periods of rain showers. Low level clouds are stacking up along the windward slopes of the Big Island and Maui this morning. These clouds will likely decrease in coverage later this morning. Upper air balloon soundings at Lihue and Hilo are observing trade wind inversion heights around 6,000 and 8,000 feet respectively. High enough to produce brief periods of showers across the region.
The subtropical ridge will remain in place far north of the Hawaiian Islands through much of next week. In the upper levels a narrow trough with embedded lows will enhance regional shower activity a bit into next week. Easterly trade winds will range from light to moderate today through Sunday and local scale sea breezes will develop each day, especially along western slopes of each island. Converging sea breeze and light trade winds each afternoon will combine forces with island surface heating to build clouds over mountain and island interior sections each afternoon. Expect isolated to scattered showers along these convergence bands that will favor western slopes of each island. More isolated showers are expected over eastern island slopes.
Memorial Day will start the transition back to more moderate trade winds as high pressure builds in over the island chain. The upper trough will remain locked in place from west to east over the Hawaii region well into the end of next week. Unstable upper lows will also roam within this trough and produce periods of enhanced shower activity as trade winds gradually strengthen through Friday. Trade wind inversion heights will range roughly from 6,000 to 8,000 feet for much of next week, which is favorable for periods of showers to continue mainly over windward and mountain areas.
Aviation
Light to moderate trade winds will continue through the weekend, with clouds and showers favoring the typical windward and mountain locations. A few showers are possible over leeward areas where sea breezes form during the afternoons. MVFR CIGs/VSBYs are possible in and around any showers that develop. Although conditions should become more stable through the day with the upper trough shifting away from the area, a few heavier showers can't be ruled out over the Big Island slopes through the afternoon period.
Moderate upper-level turbulence over the islands will hold early this morning, then weaken/diminish through the day. AIRMET Sierra for clouds and showers on the Big Island/Maui will continue through the morning hours.
Marine
Light to moderate northeast to easterly trade winds will continue through Sunday, then shift out of the east statewide and increase into the moderate to fresh range Sunday night through early next week as high pressure builds to the north.
Surf along south facing shores will remain up through early next week as small pulses out of the south-southwest direction from recent activity moving through the Tasman Sea continue. The next pulse is expected Sunday night through Tuesday.
Surf along east facing shores will ease over the weekend due to the trades backing down locally and far upstream across the eastern Pacific. A slight increase is expected next week as the trades return to moderate/fresh levels.
Surf along exposed north and west facing shores will see a slight increase out of the west-northwest Sunday night through Tuesday from a recent system lifting northeastward over the far northwest Pacific. Otherwise, back to the summertime average for the rest of the week. For the long range, WAVEWATCH III does highlight a potential small, long-period west swell associated with Tropical Cyclone Mawar in the far northwest Pacific arriving around June 6th (low confidence).
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