2-5 foot
1-3 foot
0-2 foot
4-6 foot

Moderate to fresh trade winds will continue with a surface high located northeast of the state. Trade wind swell generated to the east will keep seas above 10 feet, and the Small Craft Advisory has been extended through Sunday for most zones. The High Surf Advisory (HSA) for east facing shores will continue through Sunday.

Surf will remain below advisory levels for the remaining shores through this weekend. A small northwest swell (330 degrees) is expected arrive tonight, with a reinforcing long period, west- northwest (300 degrees) swell expected Sunday night. The west-northwest swell will peak Monday night and gradually declining through Wednesday. This second swell may warrant an HSA for exposed west and north facing shores Monday and Tuesday.

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 06:10 pm this evening. The Moon is currently 3 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

85°/88°
Wind: ENE at 9 mph
Sunrise: 6:49 AM
Sunset: 6:28 PM
current observations as of 1pm February 24th, 2018

Weather Outlook for Saturday, 20th January 2018

Summary

High pressure across the Eastern Pacific and a trough in the Central Pacific will lead to a weak ridge north of the Hawaiian Islands through the weekend. Expect easterly trade winds for most islands with modified afternoon sea breezes along southern and western slopes of Kauai and Oahu through Sunday. Unsettled weather continues over the state next week, ahead of a stronger frontal system moving across the Central Pacific. Easterly trade winds will continue through Wednesday. Wind speeds will weaken and directions will veer towards the southeast by Wednesday night. Land and sea breezes will become more widespread on Thursday and Friday. Vog may move northward into the smaller islands by the end of next week.

Detailed Discussion

The satellite imagery over the state shows a large band of unstable clouds drifting across the Hawaiian Islands from east to west. An upper level trough shown in water vapor imagery over Kauai will help enhance shower activity over Kauai and Oahu later today. A subtropical jet stream lingers just south of the Big Island.

The large scale picture remains the same with a strong high pressure system drifting away from the state into the East Pacific and a cold frontal system moving across the Central Pacific. The positions of these two large scale systems will keep a weakened ridge north of the islands along with easterly trade winds from Moloka`i to the Big Island. For Kauai and Oahu, a modified easterly trade wind regime will develop through Sunday with periods of southeasterly winds across portions of the southern slopes and on-shore winds over western slopes each afternoon. The forward motion of the cold front will stall roughly 200 miles northwest of Kauai by Sunday evening.

Monday and Tuesday…A high pressure ridge between two low pressure systems will produce moderate easterly winds each day across all islands. Expect a wet weather pattern with the highest rainfall chances over the windward slopes of the Big Island and Maui as unstable clouds upstream move into the eastern slopes of each island.

Wednesday through Friday…A stronger low pressure system will move into the Central Pacific on Wednesday with a trailing cold front approaching the islands from the northwest. Easterly winds will weaken and directions will veer towards the southeast by Wednesday night as the front gets closer. Land and sea breezes will become more widespread on Thursday and Friday. Prefrontal convergence bands will drive precipitation chances along with daytime heating and convection over island interior sections producing afternoon clouds and scattered showers. VOG from the volcano on the Big Island may also be drawn up with the southeasterly wind flow over the smaller islands on Thursday and Friday.

Slight changes were made to the forecast grids this morning. Easterly wind speeds were increased on Monday and Tuesday, and higher precipitation chances and clouds were added for next weeks unsettled weather conditions.

Central Valley (Kahului, Spreckelsville):

Breezy. Partly cloudy with isolated showers. Lows 62 to 67. Northeast winds 15 to 20 mph decreasing to up to 10 mph in the late evening and early morning, then becoming light early in the morning. Chance of rain 20 percent.

Leeward West (Lahaina, Ka`anapali):

Partly cloudy in the evening then becoming mostly cloudy. Isolated showers. Lows 63 to 70. East winds 10 to 15 mph in the evening becoming light. Chance of rain 20 percent.

Windward West (Wailuku, Waiehu):

HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST SUNDAY. Breezy. Partly sunny with scattered showers. Highs 62 to 81. East winds 10 to 20 mph. Chance of rain 50 percent.

Windard Haleakala (Hana, Haiku, Makawao):

HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST SUNDAY. Breezy. Mostly cloudy with scattered showers. Highs around 79 at the shore to around 65 at 5000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Partly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows around 66 at the shore to 50 to 55 upcountry. East winds up to 10 mph increasing to 10 to 15 mph after midnight. Gusts up to 35 mph. Chance of rain 50 percent.

Haleakala Summit

Breezy. Mostly cloudy with scattered showers. Lows around 46 at the visitor center to around 42 at the summit. East winds 15 to 25 mph. Chance of rain 50 percent.

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