12-18++ foot
5-8+ foot
2-4 foot
5-7+ foot

A large long-period northwest swell will move across Hawaiian waters during the next couple of days. Buoy 51001, located 180 nm northwest of Kauai, continues to feel the low amplitude forerunners of this swell early this evening. A sharp rise in the swell is expected overnight into Friday, and warning level surf will be reaching our shores around day break Friday.

A High Surf Warning has been issued for most north and west facing shores from Kauai to Maui for the rapidly building surf late tonight. This swell will peak on Friday at around 12 ft 20 seconds, and due to its long-period energy, we expect exposed portions of the Puna coast on the Big Island to receive advisory level surf. With this large northwest swell, a Small Craft Advisory is in effect for most waters due to the elevated and hazardous seas accompanying this swell. The swell will gradually decline on Saturday.

Elsewhere, a small long period west-northwest swell will persist into Saturday, and southeast swell in the 2 to 3 foot range will continue through much of the weekend.

Winds will remain below Small Craft Advisory levels through early next week. Moderate to locally fresh northerly winds will gradually decline through Friday as we head into a period of relatively light flow. Winds will briefly turn to typical trade wind direction on Saturday as a weakening front moves across waters around Kauai and possibly Oahu. A front will approach early next week, causing winds to shift out of the southeast late Sunday then out of the south on Monday.

Hawaii Wave Height Model

Tide Predictions

A single high tide at Kahului will be 2.0 foot at 08:58 AM

High tide at Kahului was 2.0 foot at 2:00 PM early this afternoon, dropping to a of foot at just after midnight, then of foot at just after midnight, before once again of foot at just after midnight

The sunrise was at 06:25 am this morning and will set at 05:53 pm this evening. The Moon is currently 7 days old, and is in a Quarter phase. The next Waxing Gibbous will occur at 5:24 AM on Saturday, November 4th.

Hawaii Wind Report

Maui Weather

75°/76°
Wind: N at 22 mph
Sunrise: 6:40 AM
Sunset: 5:43 PM
current observations as of 3pm November 20th, 2017

Weather Outlook for Friday, 27th October 2017

Summary

A surface trough just east of the Big Island will continue to shift slowly eastward away from the islands. A drier and cooler airmass will remain over the State through Friday, with some light showers affecting mainly windward areas. A weakening cold front will bring an increase in windward showers to Oahu and Kauai Friday night through the weekend, while the remainder of the State begins to see a slight increase in showers each day as light trade winds return. Humidity levels along with rain chances will increase Sunday night through much of next week, as winds shift around to the southeast ahead of an approaching cold front.

Detailed Discussion

Currently at the surface, a trough of low pressure located around 150 miles east of the Big Island, is moving eastward slowly. Meanwhile a weakening cold front around 150 miles northwest of Kauai is beginning to slow its southward progression as high pressure builds well to the northwest of the island chain. Infrared satellite imagery shows partly to mostly cloudy conditions across the State this evening, with radar imagery showing some very light showers moving into windward sections of Maui County and the Big Island as well as the Kau District on the Big Island. Main short term concern revolves around the large incoming northwest swell.

Tonight through Sunday, The surface trough east of the islands will shift slowly eastward over the next few days, while high pressure building far northwest of the islands settles southward, pushing the weakening cold front currently northwest of the State southward into the island chain. The weak front is expected to shift southward into Kauai Friday night and into Oahu during the day on Saturday. The front will then stall out and dissipate over the western islands Saturday night and Sunday.

Light to moderate northerly flow will weaken tonight, with light winds and localized sea breezes and land breezes expected on Friday. As high pressure builds north of the island chain, light trade winds will return Friday night and continue through the weekend.

As for sensible weather details, dry and cool conditions are expected to prevail through Friday, with light showers affecting mainly windward areas. Moisture associated with the weakening front should then increase shower coverage over Kauai Friday night and across Kauai and Oahu over the weekend. Elsewhere, returning trade wind flow will moisten up the boundary layer and this should lead to an increase in shower coverage each day across the remainder of the State through the weekend. Showers will favor windward and mauka areas, but due to the light trade winds, some leeward and interior shower development will be possible each afternoon.

Sunday night through next Thursday, Model solutions continue to show a cold front steadily approaching from the northwest through early next week, before stalling out near Kauai by the middle to latter part of next week. This will shift the winds around to the south and southeast across the island chain, increasing deep layer moisture, humidity levels and shower chances across the entire island chain. Guidance suggests that the deepest moisture and best chances for some heavier showers will exist over the western end of the island chain, particularly from Tuesday through next Thursday. The forecast will continue to be further refined as details become more clear where the deepest moisture with a connection to the tropics will set up.

Central Valley (Kahului, Spreckelsville):

HIGH SURF WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM HST SATURDAY. Mostly cloudy early in the evening then becoming partly cloudy. Isolated showers. Lows around 64. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Leeward West (Lahaina, Ka`anapali):

HIGH SURF ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM HST SATURDAY. Mostly cloudy early in the evening then becoming partly cloudy. Isolated showers. Lows around 65. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Windward West (Wailuku, Waiehu):

HIGH SURF WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM HST SATURDAY. Mostly cloudy with isolated showers. Lows 56 to 66. North winds around 10 mph. Chance of rain 20 percent.

Windard Haleakala (Hana, Haiku, Makawao):

HIGH SURF WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM HST SATURDAY. Mostly cloudy with isolated showers. Lows around 66 at the shore to around 49 at 5000 feet. South winds around 10 mph early in the evening becoming light. Chance of rain 20 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Mostly sunny. Highs around 83 at the shore to 66 to 73 upcountry. Northeast winds around 10 mph.

Haleakala Summit

Mostly sunny. Highs 61 to 67. Light winds.

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