6-10 foot
4-6 foot
0-2 foot
2-4+ foot

Northwest swell continues to slowly decline at the nearshore PacIOOS buoys, but has dropped off quickly during the past several hours at offshore Buoy 51101. The High Surf Advisory for north and west facing shores has been dropped as surf on those shores will continue to gradually decline today.

Strong northeast winds are expected to produce advisory level surf on east facing shores today and tonight, and we have issued a High Surf Advisory for those areas. These winds will drop off quickly late tonight and Saturday, but the residual swell will cause surf along east facing shores to subside more slowly.

Strong northeast winds will continue across much of the area today, and combined with the lingering swell will produce Small Craft Advisory conditions across most zones. The SCA was previously extended for most of the area through this afternoon. We have now replaced the previous Gale Warning with a SCA for the Alenuihaha Channel as well. Winds and seas will gradually subside this afternoon and tonight into the weekend, with conditions expected to be below SCA criteria for all waters Saturday through Monday.

Heavy showers and isolated thunderstorms will be possible across parts of the coastal waters today through at least Saturday due to a nearby upper level trough.

Hawaii Wave Height Model

Tide Predictions

High tide at Kahului was 2.4 foot at 2:00 PM early this afternoon, dropping to a low of 1.0 foot at 2:00 PM early this afternoon, then rising to a high of 1.5 foot at 2:00 PM early this afternoon, before once again dropping to a low of -0.2 foot at 2:00 PM early this afternoon

The sunrise was at 06:54 am this morning and will set at 05:49 pm this evening. The Moon is currently 27 days old, and is in a Waning Crescent phase. The next New Moon will occur at 6:31 AM on Monday, December 18th.

Hawaii Wind Report

Maui Weather

°/°
Wind: n/a at 0 mph
Sunrise:
Sunset:
current observations as of 1am June 22nd, 2018

Weather Outlook for Friday, 15th December 2017

Summary

Breezy north to northeast winds will continue today, but the winds will weaken from tonight into the weekend. An upper level low and increasing moisture will bring unsettled weather to portions of the state through this weekend. As a result, rain chances will increase, with locally heavy downpours possible and a slight chance of thunderstorms. Widespread rainfall is possible early next week as an upper-level trough pushes toward the islands from the northwest.

Detailed Discussion

A 1033 mb surface high is near 42N 138W, or about 1800 miles northeast of Honolulu. A surface ridge extends southwest from this high through a point approximately 600 miles north of Kauai. Elsewhere, a north to south oriented surface trough, which is moving slowly westward, is evident about 320 miles east of Hilo. The tight pressure gradient between these features is maintaining locally breezy north to northeast winds across the state. A Wind Advisory remains in effect for the Big Island Summits this morning, but the Wind Advisory has been cancelled for all lower elevations. Note that the breezy conditions combined with low dew points continue to make sensible temperatures feel relatively cool this morning.

Aloft, middle- and upper-tropospheric lows are located nearly 280 miles northeast of Hilo. The surface trough described above is a reflection of these features, which are propagating slowly toward the west-southwest. The close proximity of the lows appears to have already destabilized the atmosphere over the eastern end of the state. The early morning Hilo balloon sounding shows no significant low-level inversion. Satellite imagery and radar reflectivity data indicate mainly broken low clouds with embedded scattered showers moving down from the north and northeast toward the windward and north facing sides of most islands east of Oahu.

Significant changes will continue to develop in weather conditions across the islands today. The upper level lows, as well as the surface trough, will continue to approach the islands. As a result, the north to northeast winds will gradually weaken from later today through tonight.

The upper lows are expected to reach a position just northeast of the islands on Saturday, and then slowly pull away toward the northeast on Sunday. By Saturday, with the surface trough in the vicinity of the islands, the background flow will become light and variable across most areas. This will allow the development of local afternoon sea breezes. By Sunday, the surface trough is forecast to be located west of the state, with light southerly winds gradually spreading from east to west across the area.

The cooler temperatures aloft associated with the middle and upper-level lows will be close enough to continue destabilizing the atmosphere today, especially over the eastern end of the island chain. In addition, increasing moisture will move in to the islands as the surface trough approaches the state. This will likely usher in an extended period of unsettled weather across the region, with increasing chances for rainfall, and the possibility of locally heavy downpours and isolated thunderstorms. In addition, there is a chance of rain mixed with snow on the Big Island Summits.

The current forecast continues to favor the eastern half of the state for the heavier rainfall. There is a slight chance of thunderstorms this afternoon due to the instability aloft. By Saturday afternoon, daytime heating and local sea breezes may provide additional support for deep convection.

Widespread showers are becoming a distinct possibility early next week as an upper-level trough digs down toward the islands from the northwest, and deep tropical moisture pushes up from the southeast. In addition, a couple of cold fronts may sweep across the islands from the northwest later in the week, which may result in an extended period of northwest winds.

Central Valley (Kahului, Spreckelsville):

Mostly cloudy with scattered showers. Locally heavy rainfall possible. Lows 57 to 62. North winds 10 to 15 mph. Chance of rain 50 percent.

Leeward West (Lahaina, Ka`anapali):

Breezy. Mostly cloudy with scattered showers. Locally heavy rainfall possible. Lows 58 to 65. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Windward West (Wailuku, Waiehu):

HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST SATURDAY. Mostly cloudy. Breezy. Occasional showers in the morning, then showers likely and slight chance of thunderstorms in the afternoon. Locally heavy rainfall possible in the afternoon. Highs 57 to 76. Northeast winds 15 to 20 mph. Chance of rain 80 percent.

Windard Haleakala (Hana, Haiku, Makawao):

HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST SATURDAY. Mostly cloudy. Occasional showers in the morning, then showers likely and slight chance of thunderstorms in the afternoon. Locally heavy rainfall possible in the afternoon. Highs around 74 at the shore to around 60 at 5000 feet. Northeast winds 10 to 15 mph with gusts to 30 mph. Chance of rain 80 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Mostly cloudy with scattered showers. Locally heavy rainfall possible. Lows around 61 at the shore to 44 to 50 upcountry. Northeast winds around 10 mph with gusts to 25 mph early in the evening becoming light. Chance of rain 50 percent.

Haleakala Summit

Mostly cloudy with scattered showers. Locally heavy rainfall possible. Lows around 40 at the visitor center to around 36 at the summit. North winds around 10 mph early in the evening becoming light. Chance of rain 40 percent.

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