15-25+ foot
7-10++ foot
0-3 foot
1-4++ foot

A High Surf Warning is in effect for north and west facing shores of most islands with a High Surf Advisory for north facing shores of the Big Island of Hawaii. A very large north northwest swell is peaking this morning, but remain quite large on Thursday, then subside through Saturday.

North winds are spreading over the Hawaiian coastal waters behind a dissipating front. For now, wind speeds are below the 25 knot Small Craft Advisory threshold, but a SCA is in effect for most waters due to large seas associated with the north northwest swell.

Winds will strengthen over the next 36 hours as high pressure builds northwest of the area and a trough forms to the east. Winds will reach SCA levels in the windier areas around the Big Island and Maui County today strengthening to near-gale force on Thursday. Winds will subside Friday into Saturday as the trough approaches from the east.

The approaching trough will bring increasing moisture and instability, so thunderstorms will be possible as early as Thursday night.

Hawaii Wave Height Model

Tide Predictions

High tide at Kahului was 1.9 foot at 2:00 PM early this afternoon, dropping to a low of 1.1 foot at 2:00 PM early this afternoon, then rising to a high of 1.7 foot at 2:00 PM early this afternoon, before once again dropping to a low of 0.0 foot at 2:00 PM early this afternoon

The sunrise was at 06:53 am this morning and will set at 05:48 pm this evening. The Moon is currently 25 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 4am September 26th, 2018

Weather Outlook for Wednesday, 13th December 2017

Summary

A dissipating cold front located near the Big Island will shift east of the state by tonight. Gusty north-northeast winds with cool and dry conditions will continue to fill in behind the front today through Thursday, with unsettled weather possible Friday through the weekend.

Detailed Discussion

The latest hi-res model guidance remains in good agreement through Thursday and shows the frontal boundary near the Big Island shifting east of the state by tonight. Clouds and showers along and ahead of this boundary will remain in the forecast today, especially along the northern coast of the Big Island. Rainfall accumulations, however, will remain on the light side as the front continues to dissipate as it moves through. The latest rainfall summary over the past 12 hrs reflects this with peak amounts coming in less than half of an inch over Maui County as the boundary moved through overnight.

Drier and cooler air will continue to fill in (PWs down toward half of an inch; dewpoints into the mid/upper 50s) behind this boundary through Thursday. North-northeast will become gusty through this time, especially tonight through Thursday (potentially reaching advisory levels for some of the typically windier lower elevation areas). For the summits on the Big Island, a high wind watch is now in effect beginning tonight and continuing through Thursday.

Changes in the weather are afoot late in the week as global models are consistently depicting an upper level low dropping south as it cuts off from the jet stream to the north, reaching a position northeast of the islands Friday. The upper low will bring instability and cold temperature to the middle and upper atmosphere allowing for increasing rainfall chances, and heavier showers. Near the surface, a low is expected to form east of the state in response to the upper low. The instability aloft, low pressure near the surface, and increasing low-level moisture will lead to unsettled weather over the islands with the possibility of heavy rain and thunderstorms, and the chance of snow for the Big Island summits. However, models are still having a difficult time agreeing with the location of the upper low and the timing of how long the low stays in the island’s vicinity. The current forecast has increasing showers and rainfall totals Thursday night through Saturday. Slight chance of thunderstorms remains in the forecast starting Friday over the eastern windward waters. More fine tuning will continue as the details become clearer as model solutions converge.

Central Valley (Kahului, Spreckelsville):

HIGH SURF WARNING IN EFFECT UNTIL 6 PM HST THURSDAY. Mostly sunny. Breezy. Scattered showers in the morning. Highs 78 to 83. North winds 10 to 15 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 50 percent.

Leeward West (Lahaina, Ka`anapali):

Breezy. Partly cloudy with isolated showers. Lows 62 to 69. Northeast winds 15 to 25 mph. Chance of rain 20 percent.

Windward West (Wailuku, Waiehu):

HIGH SURF WARNING IN EFFECT UNTIL 6 PM HST THURSDAY. Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 61 to 80. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Windard Haleakala (Hana, Haiku, Makawao):

HIGH SURF WARNING IN EFFECT UNTIL 6 PM HST THURSDAY. Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 78 at the shore to around 64 at 5000 feet. North winds around 10 mph with gusts to 35 mph. Chance of rain 50 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Mostly clear. Lows around 65 at the shore to 48 to 54 upcountry. North winds up to 10 mph shifting to the northeast early in the morning.

Haleakala Summit

Mostly clear. Breezy. Lows around 44 at the visitor center to around 40 at the summit. North winds 10 to 25 mph.

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