Today: Mostly sunny. Isolated showers in the morning, then slight chance of thunderstorms and isolated showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 60 to 68 near the shore to 51 to 56 at 4000 feet. West winds up to 10 mph. Chance of rain 50 percent.
Wednesday: Partly sunny. Scattered showers in the morning, then scattered showers and slight chance of thunderstorms in the afternoon. Highs 77 to 82 near the shore to 64 to 70 at 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.
Kona
Today: Sunny. Slight chance of thunderstorms and isolated showers in the afternoon. Highs 80 to 85 near the shore to around 66 near 5000 feet. Northwest winds up to 10 mph. Chance of rain 20 percent.
Tonight: Mostly clear. Isolated showers in the evening. Lows 66 to 72 near the shore to 44 to 53 near 5000 feet. Light winds. Chance of rain 20 percent.
ARTICLE CONTINUES BELOW AD
ARTICLE CONTINUES BELOW AD
Wednesday: Sunny in the morning, then partly sunny with scattered showers and slight chance of thunderstorms in the afternoon. Highs 81 to 86 near the shore to around 67 near 5000 feet. Light winds. Chance of rain 50 percent.
Waimea
Today: Mostly sunny. Breezy. Isolated showers in the morning, then slight chance of thunderstorms and isolated showers in the afternoon. Highs 62 to 83. East winds 10 to 20 mph. Chance of rain 20 percent.
Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 59 to 64 near the shore to 50 to 59 near 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.
Wednesday: Partly sunny. Scattered showers in the morning, then scattered showers and slight chance of thunderstorms in the afternoon. Highs 63 to 84. East winds 10 to 15 mph. Chance of rain 50 percent.
Kohala
Today: Mostly sunny. Breezy. Isolated showers in the morning, then slight chance of thunderstorms and isolated showers in the afternoon. Highs 62 to 83. East winds 10 to 20 mph. Chance of rain 20 percent.
ARTICLE CONTINUES BELOW AD
Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 59 to 64 near the shore to 50 to 59 near 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.
Wednesday: Partly sunny. Scattered showers in the morning, then scattered showers and slight chance of thunderstorms in the afternoon. Highs 63 to 84. East winds 10 to 15 mph. Chance of rain 50 percent.
South Big Island
Today: Mostly sunny. Breezy. Slight chance of thunderstorms and isolated showers in the afternoon. Highs around 81 near the shore to around 66 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.
Tonight: Partly cloudy with isolated showers. Lows around 69 near the shore to around 48 near 5000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Wednesday: Sunny in the morning, then partly sunny with scattered showers and slight chance of thunderstorms in the afternoon. Highs around 82 near the shore to around 67 near 5000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.
Puna
ARTICLE CONTINUES BELOW AD
Today: Mostly sunny. Isolated showers in the morning, then slight chance of thunderstorms and isolated showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 60 to 68 near the shore to 51 to 56 at 4000 feet. West winds up to 10 mph. Chance of rain 50 percent.
Wednesday: Partly sunny. Scattered showers in the morning, then scattered showers and slight chance of thunderstorms in the afternoon. Highs 77 to 82 near the shore to 64 to 70 at 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.
Waikoloa
Today: Sunny and breezy. Scattered showers and slight chance of thunderstorms in the afternoon. Highs 78 to 85 near the shore to 64 to 69 above 4000 feet. North winds up to 20 mph. Chance of rain 50 percent.
Tonight: Breezy. Partly cloudy with isolated showers. Lows 64 to 72 near the shore to 45 to 53 above 4000 feet. East winds up to 20 mph shifting to the southeast up to 10 mph after midnight. Chance of rain 20 percent.
Wednesday: Sunny in the morning, then partly sunny with scattered showers and slight chance of thunderstorms in the afternoon. Highs 79 to 86 near the shore to 65 to 71 above 4000 feet. Northwest winds up to 10 mph. Chance of rain 40 percent.
Detailed Forecast
Synopsis
An approaching cold front will stall and weaken near Kauai today. Expect trade winds to spread from west to east through Wednesday. Instability associated with a passing upper trough may enhance showers across the state and trigger thunderstorms on the Big Island for the next couple of afternoons. Drier weather will move in during the second half of the week.
Discussion
A weakening cold front lies northwest of Kauai this morning, and light east to northeast winds are noted across local waters. Satellite loop shows an upper trough passing north of the main Hawaiian Islands. Associated instability will slide by over the next couple of days and may be enough to enhance showers statewide and trigger thunderstorms for the Big Island each afternoon.
Models show the front will stall and slowly dissipate as it reaches Kauai. Gentle to moderate trades will advance westward today, reaching all islands by Wednesday. Expect an increase in showers on Kauai and Oahu today, with the building trades focusing rainfall over windward slopes. Maui County and the Big Island will stay in the daytime sea breeze/nighttime land breeze pattern today, with daytime showers, along with a slight chance of thunderstorms on the Big Island, focused over island interiors. Instability aloft will continue to enhance clouds and showers through Wednesday.
Upper ridging will build in Thursday, with broad high pressure setting up across the east Pacific. Trades will become moderate to fresh through the end of the week with the typical windward focused clouds and showers moving in.
Aviation
A clouds and showers associated with a weakening cold front will stall over Kauai today as trade winds will spread moderate east- northeast winds across the state. The north and east slopes of Kauai will see passing trade wind showers, while the rest of the state will stay mostly dry with brief showers favoring windward and mountain areas of each island. Afternoon sea breezes will linger over terrain sheltered western slopes due to these lighter than normal trade winds. Slight chance of afternoon thunderstorms remain in the forecast for the Big Island.
No AIRMETs are currently in effect, and none are anticipated tonight.
Marine
Moderate to fresh easterly trades will return statewide today as high pressure builds north of the area behind a dissipating front. Ridge will briefly weaken Thursday in response to another front passing to the north, then strengthen Friday through the weekend – likely supporting advisory-level trades in the typically windier areas and channels between Maui County and the Big Island.
Surf along exposed north and west facing shores will trend up today as a mix of medium-period north-northwest and northwest swells move through. Early morning buoy observations are showing this new energy (peaking slightly later than advertised), which should correspond to a building trend this morning before peaking later today (likely below advisory levels). Surf associated with this swell will linger into Wednesday, then move out Thursday.
A long-period, west-northwest swell associated with a large area of gale- to storm-force winds that has setup over the far northwest Pacific over the past 24-hrs is forecast to arrive by late Thursday and peak near the advisory-levels for exposed north and west facing shores Thursday night through Friday. A downward trend is expected over the weekend.
Surf along south facing shores will begin building by Thursday night as a small, long-period southerly swell arrives from a recent system passing within Hawaii's swell window down south. This source will linger into the weekend before moving out.
Despite the return of trades, surf along east facing shores will remain small due to a limited fetch upstream.
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