4-6 foot
3-5 foot
0-2 foot
4-6 foot

Moderate to fresh trade winds will continue over the coastal waters with a surface high located east-northeast of the state. Another high is forecast to build in from the NW, continuing the breezy trade wind pattern. A trade wind swell generated east of the state will keep seas above 10 feet through Monday, so the Small Craft Advisory remains in effect for most zones. The High Surf Advisory (HSA) for east facing shores continues through today as well.

The current small northwest swell will be reinforced by a long period, west-northwest swell tonight. This swell will peak Monday night and gradually decline through Wednesday. This second swell may warrant an HSA for exposed west and north facing shores Monday and Tuesday. A smaller northwest swell is possible late in the week.

Hawaii Wave Height Model

Tide Predictions

A single tide at Kahului will be foot at

tide at Kahului was foot at just after midnight, 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 07:03 am this morning and will set at 06:11 pm this evening. The Moon is currently 4 days old, and is in a Waxing Crescent phase. The next First Quarter will occur at 10:20 PM on Wednesday, January 24th.

Hawaii Wind Report

Maui Weather

°/°
Wind: n/a at 0 mph
Sunrise:
Sunset:
current observations as of 11am June 23rd, 2018

Weather Outlook for Sunday, 21st January 2018

Summary

Moderate trade winds will deliver a steady stream of clouds and showers the next couple of days as moisture associated with an old frontal boundary combines with a weak disturbance aloft. Showers will favor windward and mauka areas with periods of isolated to scattered showers drifting leeward. Winds may diminish Thursday through Saturday with a land and sea breeze weather regime setting up.

Detailed Discussion

A few isolated thunderstorms developed over the Big Island last night in the afternoon and evening hours with snow showers falling on the summits of Maunakea and Maunaloa last night. We issued a Winter Weather Advisory for 2 to 4 inches of snowfall above 12000 feet elevation valid until 6pm tonight. Roads to the summit of Maunakea have been closed due to dangerously slick and icy road conditions. Periods of additional snowfall are possible over the summit areas through the upcoming work week.

Satellite imagery from this morning shows a band of cumulus and high level cirrus clouds northwest of Kauai associated with an approaching cold front and the upper level jet stream. A long band of unstable clouds, extending roughly 2000 miles east of Hawaii, has shifted slightly south of the Big Island overnight. Short term forecast guidance shows this band will move northward streaming back into the islands later this afternoon and evening.

The large scale analysis continues to show a high pressure system centered over the East Pacific with ridge north of the islands, and a cold frontal system moving through the Central Pacific. Moderate easterly trade winds are now expected to blow across the island chain through Wednesday. Unsettled and wet weather conditions are forecast to continue through the middle of the week as the high pressure ridge axis remains near 30 degrees north latitude with troughing in the upper atmosphere. The position of this ridge and the upper trough will help lift trade wind inversion heights above normal levels, allowing a deeper boundary layer to form with more active showers. The highest coverage for clouds and showers will occur along the windward slopes of each island with some showers drifting over leeward sections.

A second cold front with a much deeper low center will pass into the Central Pacific on Wednesday. This cold frontal trough will weaken the ridge north of the islands from Thursday through Saturday. Winds will veer towards the southeast and become light with surface heating and cooling over each island driving daytime sea breezes and nighttime land breezes. Expect typical sea breeze cloud ceilings over island interior sections with isolated to scattered showers each afternoon. Mostly clear skies and isolated showers are forecast each night as the land breeze develops.

The main updates to the forecast this morning include adding isolated thunderstorms to the entire Big Island for the afternoon through evening hours, and weather adjustments for the developing land and sea breeze regime over the islands from Thursday to Saturday.

Central Valley (Kahului, Spreckelsville):

Mostly cloudy with isolated showers. Lows 62 to 67. East winds 10 to 15 mph with gusts to 30 mph. Chance of rain 20 percent.

Leeward West (Lahaina, Ka`anapali):

Mostly cloudy with scattered showers. Lows 63 to 70. East winds 10 to 15 mph. Chance of rain 50 percent.

Windward West (Wailuku, Waiehu):

HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST THIS EVENING. Breezy. Mostly cloudy with showers likely. Highs 61 to 80. East winds 10 to 20 mph. Chance of rain 70 percent.

Windard Haleakala (Hana, Haiku, Makawao):

HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST THIS EVENING. Cloudy and breezy. Occasional showers in the morning, then showers likely in the afternoon. Highs around 78 at the shore to around 64 at 5000 feet. East winds 10 to 20 mph. Chance of rain 90 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Breezy. Mostly cloudy with isolated showers. Lows around 66 at the shore to 50 to 55 upcountry. East winds 10 to 20 mph. Chance of rain 20 percent.

Haleakala Summit

Breezy. Mostly cloudy with isolated showers. Lows around 46 at the visitor center to around 41 at the summit. East winds 15 to 20 mph. Chance of rain 20 percent.

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