West Side

Today: Sunny and breezy. Isolated showers in the morning. Highs 76 to 89. Northeast winds up to 25 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Breezy. Lows 70 to 76. Northeast winds up to 25 mph decreasing to up to 15 mph after midnight.

Saturday: Mostly sunny with isolated showers. Highs 77 to 90. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

South Side

Today: Sunny and windy. Highs 76 to 89. Northeast winds up to 25 mph shifting to the north in the afternoon.

Tonight: Mostly clear. Windy. Lows around 73. North winds up to 30 mph decreasing to up to 20 mph after midnight.

Saturday: Mostly sunny. Highs 78 to 90. North winds 10 to 15 mph.

North Shore

Today: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs around 81 near the shore to around 66 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Breezy. Scattered showers. Lows around 73 near the shore to around 59 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs around 82 near the shore to around 71 near 5000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Central Maui

Today: Sunny and breezy. Isolated showers in the morning. Highs 80 to 87. Northeast winds 10 to 25 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Breezy. Lows 70 to 75. Northeast winds up to 25 mph decreasing to up to 15 mph after midnight.

Saturday: Partly sunny with isolated showers in the morning, then mostly sunny in the afternoon. Highs 81 to 88. Northeast winds around 10 mph. Chance of rain 20 percent.

Upcountry

Today: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 55 to 71. East winds up to 10 mph. Chance of rain 50 percent.

Tonight: Partly cloudy with isolated showers. Lows around 52 at the visitor center to around 50 at the summit. Light winds becoming east up to 15 mph after midnight. Chance of rain 20 percent.

Saturday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 69 to 74. East winds 10 to 15 mph. Chance of rain 50 percent.

East Maui

Today: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs around 81 near the shore to around 66 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Breezy. Scattered showers. Lows around 73 near the shore to around 59 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs around 82 near the shore to around 71 near 5000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Lanai City

Today: Sunny and windy. Highs 71 to 82. Northeast winds up to 30 mph.

Tonight: Mostly clear. Windy. Lows 65 to 72. Northeast winds up to 30 mph decreasing to up to 15 mph after midnight.

Saturday: Mostly sunny. Highs around 81. East winds up to 15 mph becoming around 10 mph in the afternoon.

Kaunakakai

Today: Sunny and windy. Highs 69 to 88. Northeast winds 10 to 30 mph.

Tonight: Mostly clear. Windy. Lows 61 to 77. Northeast winds 10 to 30 mph shifting to the east 10 to 15 mph after midnight.

Saturday: Mostly sunny. Highs 77 to 89. East winds 10 to 15 mph.

Detailed Forecast

Synopsis

A high pressure ridge to the north and Hurricane Lowell passing south of the Hawaiian Islands will keep breezy trade winds in the forecast today. Expect decreasing wind speed trends this weekend as a low pressure trough moving into the Central Pacific basin weakens the ridge north of the state. Periods of showers will favor windward mountain areas with brief passing showers over leeward zones. Hurricane Lowell will remain near major hurricane strength when it moves closer to the western Hawaiian Islands late Monday and Monday night. Weather impacts such as high surf and heavy rain may extend hundreds of miles from the center of Hurricane Lowell.

Discussion

Looking into the satellite imagery a long band of unsettled clouds with embedded showers are riding into the islands on the trade winds this morning. Periods of showers will continue to drift over the windward mountain slopes of each island through the morning hours. Elsewhere Hurricane Lowell roughly 600 miles south of Oahu and Kauai continues to drift slowly westward this morning. A gradual decrease in the forward speed of Lowell remains in the forecast for the next day or two, followed by a sharp turn to the north on Sunday.
Hurricane Lowell will remain near major hurricane strength when it moves closer to the western Hawaiian Islands late Monday and Monday night. There remains a risk for high surf, storm surge, strong winds and heavy rainfall impacts for portions of Hawaii including in particular the islands of Niihau and Kauai. Deep tropical moisture will advect northward across all island, producing warm and humid weather conditions with increasing heavy rainfall trends from Sunday into Tuesday as Hurricane Lowell turns northward. Initial storm total rainfall estimates range from 2 to 8 inches statewide with locally higher amounts of around 10 inches possible along terrain favored south and southeast slopes. Please continue to closely monitor the weather forecast for early next week as the track and associated impacts with Hurricane Lowell will likely evolve over time.
High pressure builds back over the islands from Tuesday afternoon onward as a wet trade wind pattern with periods of passing showers sets up across the state into the end of next week.

Aviation

Mostly VFR through the TAF period with the exception of passing MVFR showers favoring windward mountain areas through this morning. Moderate trades to breezy conditions into the afternoon with some sites gusting near 30 kts for wind favored locations after 20z Fri. Brief showers return after 08Z tonight with locally MVFR cigs.
Hurricane Lowell will continue to pass south of the island chain through Saturday. On this westerly track, regional trade winds will remain breezy per a tight pressure gradient between the hurricane and high pressure to the far north.
AIRMET Sierra remains in effect for mountain obscurations through later this morning for windward parts of the islands.
AIRMET Tango remains in effect for moderate low level turbulence south through west downstream of high terrain. AIRMET Tango will likely be in effect for the foreseeable future.

Marine

A surface high persists north of the Hawaiian Islands and will slowly drift east through the weekend. Currently, Hurricane Lowell is passing near 450 nm south of the islands as it continues to track west. The interaction between the two will strengthen the trade winds across the coastal waters to fresh to locally near gale force. A Small Craft Advisory (SCA) has been extended for all Hawaiian Waters through Saturday and will likely be extended.
The latest track from Hurricane Lowell from the National Hurricane Center is bringing Tropical Storm conditions to the far southern offshore waters. Although as Hurricane Lowell turns north, confidence is growing for hurricane conditions to the southwest and western offshore waters on Sunday. How close it gets to the state, is yet to be determined. As for Hurricane Karina, confidence is increasing that Karina will pass to the north and northeast of the state.
Swells from Hurricane Lowell are filling in and will remain elevated above High Surf Advisory (HSA) conditions through Saturday. A large, medium-period east swell from Hurricane Karina is filling in and will continue though the weekend, producing high end advisory level surf or warning level surf along east facing shores. The HSA has been extended in time and expanded to include east facing shores. The swell from Lowell will gradually veer from southeast towards the southwest early next week. While, the forecast for swells and seas for next week will highly depend on the eventual track and intensity of Lowell, confidence is beginning to increase for the potential of extra- large surf (exceeding warning levels) along south and western exposures early next week. Coinciding also with monthly high tides, this will create the potential for impacts to harbor entrances, channels, as well as coastal properties and infrastructure including roadways.

Fire weather

Trade wind speeds will begin to trend lower as the ridge north of the islands slowly weakens. Periods of passing showers will mainly impact windward mountain slopes for the next few days. Higher humidity levels will continue to keep conditions under critical fire weather thresholds into next week. The temperatures inversion heights near Maui and the Big Island will range from 6,000 to 7,000 feet elevation today.

HFO Watches/Warnings/Advisories

High Surf Advisory until 6 AM HST Saturday for south and east facing shores of all Hawaiian Islands.
Small Craft Advisory until 6 AM HST Saturday for all Hawaiian waters,

Data Courtesy of NOAA.gov