Photo Credit: Tyler Rooke

West Side

Today: Sunny. Highs 77 to 89. Northeast winds up to 15 mph.

Tonight: Mostly clear. Lows 67 to 75. Southeast winds up to 10 mph in the evening becoming light.

Friday: Mostly sunny. Isolated showers in the afternoon. Highs 78 to 90. Light winds becoming northeast up to 10 mph in the afternoon. Chance of rain 20 percent.

South Side

Today: Sunny. Highs 79 to 90. North winds up to 15 mph increasing to 10 to 15 mph in the afternoon.

Tonight: Mostly clear. Lows 69 to 74. North winds up to 10 mph in the evening becoming light.

Friday: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 80 to 91. Light winds becoming northwest up to 10 mph in the afternoon. Chance of rain 20 percent.

North Shore

Today: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 80 to 85 near the shore to around 69 near 5000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 69 to 74 near the shore to 51 to 57 near 5000 feet. Southeast winds up to 10 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 80 to 86 near the shore to around 70 near 5000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Central Maui

Today: Sunny. Highs 80 to 88. Northeast winds up to 15 mph.

Tonight: Mostly clear. Lows 68 to 73. North winds up to 10 mph in the evening becoming light.

Friday: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 82 to 90. Northeast winds up to 15 mph. Chance of rain 20 percent.

Upcountry

Today: Mostly sunny. Isolated showers in the morning. Highs 55 to 73. Southeast winds up to 10 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows around 51 at the visitor center to around 46 at the summit. Southeast winds up to 10 mph. Chance of rain 50 percent.

Friday: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 55 to 74. East winds up to 15 mph. Chance of rain 50 percent.

East Maui

Today: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 80 to 85 near the shore to around 69 near 5000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 69 to 74 near the shore to 51 to 57 near 5000 feet. Southeast winds up to 10 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 80 to 86 near the shore to around 70 near 5000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Lanai City

Today: Mostly sunny. Highs 71 to 81. Northeast winds up to 10 mph.

Tonight: Partly cloudy. Lows 61 to 68. Light winds.

Friday: Mostly sunny. Isolated showers in the afternoon. Highs 72 to 82. Light winds. Chance of rain 20 percent.

Kaunakakai

Today: Mostly sunny. Highs 69 to 91. Northeast winds up to 15 mph.

Tonight: Mostly clear. Lows 57 to 76. East winds up to 10 mph in the evening becoming light.

Friday: Mostly sunny. Isolated showers in the afternoon. Highs 69 to 92. East winds up to 10 mph. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Gentle to moderate trade winds will trend weaker through Friday, then gradually strengthen through the weekend to become moderate to breezy by early next week. Limited low clouds and showers will favor windward and mauka areas with the exceptions being on Friday when winds become light enough to allow for sea breeze development and Friday night into Saturday as a plume of slightly enhanced moisture moves through the state.

Discussion

A low pressure system is situated about 1100 miles northeast of the state as of this morning. This low is weakening the ridge that is extending across the Eastern and Central Pacific, which in turn is reducing the pressure gradient across the state. Gentle to moderate trade winds will become light to gentle by Friday as the low pressure system broadens to our north. With a fairly dry and stable airmass over the state, limited clouds and showers will remain concentrated over windward and mauka areas into early next week. Some showers may spill over to leeward areas during the overnight night hours. Chances of clouds and showers may increase slightly over leeward interior areas Friday afternoon as light winds support sea breeze development. For Kona slopes of the Big Island, clouds will increase in coverage during the daytime hours as sea breezes develop and then clear/push offshore overnight as land breezes kick in.
Global models show a subtle plume of enhanced moisture moving across the state Friday night through Saturday, a slight uptick in low clouds and showers to windward and mauka areas is expected through that period. Dewpoint temperatures will also creep up in the low 70's making air temperatures feel slightly warmer over the weekend and linger into next week.
Moderate to locally breezy trade winds will then gradually return over the weekend into early next week as the low lifts further northeastward, allowing the ridge to strengthen northeast of the state.

Aviation

A mostly dry and stable airmass over the islands will limit cloud and shower development, with moderate trade winds continuing through the rest of week. VFR conditions expected to prevail.
No AIRMETs are in effect, and none are expected today.

Marine

Trade winds will gradually ease through Friday as a broad area of low pressure deepens far northeast of the state. Wind speeds will restrengthen to moderate to locally strong levels over the weekend as the ridge to the north builds back over the islands.
A moderate south swell will continue to build through the day, peaking Friday night, then slowly decline over the weekend. Surf heights at the peak of the swell should remain just below High Surf Advisory criteria.
Surf along east facing shores will slowly decline by the end of the week as trade winds decline. Surf along north facing shores will remain tiny through the end of the week. In the long range, a small out of season north- northwest swell is possible around Monday of next week.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov