Sunrise 5:52 AM   Sunset 6:52 PM Moonrise 2:48 AM   Moonset 2:44 PM

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PHZ119 Maalaea Bay- 330 Pm Hst Fri May 3 2024
.small craft advisory in effect through early Monday morning - .
Tonight - North winds 25 to 30 knots. Seas 3 to 5 feet. Wave detail: east northeast 4 feet at 3 seconds. Saturday - North winds to 25 knots, rising to 30 knots in the afternoon. Seas 3 to 4 feet. Wave detail: north northeast 4 feet at 4 seconds. Saturday night - North winds to 25 knots. Seas 3 to 4 feet. Wave detail: north northeast 4 feet at 4 seconds. Isolated showers. Sunday - North winds to 25 knots. Seas 3 to 4 feet. Wave detail: north northeast 3 feet at 4 seconds. Isolated showers. Sunday night - North northeast winds to 25 knots. Seas to 3 feet. Wave detail: north northeast 3 feet at 4 seconds. Isolated showers. Monday - North northeast winds to 25 knots. Seas to 3 feet. Isolated showers in the morning. Monday night - North northeast winds to 25 knots, easing to 20 knots after midnight. Seas to 3 feet. Tuesday - North northeast winds to 20 knots, rising to 25 knots in the afternoon and evening, then easing to 20 knots after midnight. Seas to 3 feet. Isolated showers. Wednesday - North northeast winds to 20 knots, rising to 25 knots in the afternoon and evening, then easing to 20 knots after midnight. Seas to 3 feet. Scattered showers.

PHZ100 330 Pm Hst Fri May 3 2024
Synopsis for hawaiian coastal waters - Fresh to locally strong trades will persist through the weekend as a high builds far north of the state and remains nearly stationary. The high will begin to move east early next week and trades will ease a notch.

FXHW60 PHFO 040125 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 325 PM HST Fri May 3 2024

SYNOPSIS
Breezy trades will become slightly more unstable with pockets of heavier showers possible through the weekend, mainly windward and mauka. A drier moderate trade wind pattern then becomes established by the middle of next week.

DISCUSSION

Regional satellite shows a closed upper low positioned just SE of 170N/30N. Modest convection, including a few thunderstorms, are noted within its core and beneath the cold pool aloft (-15C at 500mb) several hundred miles NW of the Hawaiian Islands. A shortwave trough wrapping around the southeast periphery of this low enhanced trade wind showers last night and is now lifting north of the area. As a consequence, showers have decreased in coverage during the last several hours. Otherwise, trade winds have settled in and will take the edge off of afternoon heat compared the last several days as showers focus over windward and mauka zones in routine fashion.

Trades will then acquire a decreasingly stable character as the aforementioned upper low opens up and shears east along the northern periphery of the subtropical jet. The inversion is modeled to weaken and lift by a few thousand feet which will increase the depth of trade wind showers as they advance across the area. This will facilitate slightly greater rain rates and increase leeward penetration of showers. Waves of forcing rotating around the low will be responsible for periodically increasing shower coverage Saturday night through early next week. During this time, the cold pool aloft will move directly overhead and is modeled to moderate to around -11C at 500mb. Lapse rates will still be adequate for pockets of deep convection to develop Sunday night through Monday night, mainly during the overnight periods. Isolated thunderstorms cannot be ruled out during this period, but confidence at this stage is too low to warrant explicit inclusion in the forecast. Meanwhile, a separate thunderstorm threat may manifest over the Big Island where a plume of steep lapse rates on the order of 7C/km is modeled to extend northeastward over the eastern end of the state. This will contribute to an increased probability of pockets of heavy showers and/or isolated thunderstorms Sunday and Monday afternoon, particularly as the upper jet provides maximum venting aloft on Sunday followed by the upper wave itself pivoting through on Monday.
Confidence at this stage once again falls short of inclusion in the forecast but will be given consideration in future forecast cycles.

Pressure falls over a broad swath of the Central Pacific will then ease the gradient leading to a drier moderate trade wind pattern by the middle of next week.

AVIATION

Breezy easterly trades will continue through the weekend as high pressure builds in from the NE. Moisture riding in on the trades will focus clouds and showers over windward and mauka areas, with the greatest shower activity during the late night and early morning hours. A few showers may spill over to leeward areas at times. VFR conditions will generally prevail, but MVFR conditions will be possible in any heavier showers that develop.

AIRMET Sierra is in effect for tempo mountain obscuration for windward and mauka portions of the island chain. This AIRMET will likely be needed through tomorrow morning.

AIRMET Tango is in effect for mod turb below 9000 feet downwind of island terrain. Conditions are borderline, but should continue through Saturday.

AMD NOT SKED in for Midway due to missing wind speed and direction

MARINE

High pressure far north-northeast of the state will produce fresh to strong trade winds across Hawaiian waters for the next several days. These stronger trades may ease slightly early next week as the high begins to move farther to the northeast. An advanced scatterometer (ASCAT) pass today continued to show Small Craft Advisory (SCA) level winds across most coastal water zones, a trend which will continue through the weekend. As a result, a SCA remains in effect for all Hawaiian waters through early Monday morning.

Surf along north and west facing shores remains tiny this afternoon, but a small, long-period northwest swell will fill in this evening and tonight, peak on Saturday, then gradually decline into Sunday. Observations from Buoy One (51001) suggest that forerunners from this swell should begin arriving at Kauai late this afternoon, followed by Oahu this evening, and finally Maui and the Big Island during the overnight through early morning hours. This swell will increase surf heights noticeably for north and west facing shores tonight through Saturday, but will remain in the small category. Another small, long period northwest swell will fill in late Sunday, maintaining small surf along north and west facing shores into early next week.

Small background south swells will continue into Saturday, providing tiny surf for south facing shores. Forerunners of a small, long period south swell may arrive Saturday afternoon with a slow onset through Sunday providing a boost in surf along south facing shores into early next week.

Rough and choppy surf along east facing shores will increase slightly on Saturday and hold into early next week as strong trades persist.

HFO WATCHES/WARNINGS/ADVISORIES
Small Craft Advisory until 6 AM HST Monday for all Hawaiian waters-

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Kihei
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Fri -- 02:48 AM HST     Moonrise
Fri -- 05:54 AM HST     Sunrise
Fri -- 06:38 AM HST     -0.24 feet Low Tide
Fri -- 01:19 PM HST     1.44 feet High Tide
Fri -- 02:44 PM HST     Moonset
Fri -- 06:25 PM HST     0.26 feet Low Tide
Fri -- 06:51 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Kihei, Maui (Hawaii) (2), Tide feet

Kahului
Click for Map
Fri -- 02:48 AM HST     Moonrise
Fri -- 05:53 AM HST     Sunrise
Fri -- 05:59 AM HST     0.27 feet Low Tide
Fri -- 11:46 AM HST     1.35 feet High Tide
Fri -- 02:44 PM HST     Moonset
Fri -- 05:07 PM HST     0.46 feet Low Tide
Fri -- 06:51 PM HST     Sunset
Fri -- 11:35 PM HST     2.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Kahului, Kahului Harbor, Hawaii, Tide feet

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