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Marine Weather and Tide Forecast for Nanawale Estates, HI

April 21, 2025 8:32 PM HST (06:32 UTC) Change Location
Sunrise 5:56 AM   Sunset 6:41 PM
Moonrise 1:35 AM   Moonset 12:53 PM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

Marine Forecasts
   
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NOTE: Zones were updated 3/20/2025
PHZ122 Big Island Windward Waters- 316 Pm Hst Mon Apr 21 2025

Tonight - East southeast winds 10 to 15 knots, becoming southeast 15 to 20 knots after midnight. Seas to 4 feet. Wave detail: east southeast 4 feet at 8 seconds. Scattered showers this evening. Isolated showers after midnight.

Tuesday - Southeast winds 15 to 20 knots. Seas 4 to 5 feet. Wave detail: east southeast 5 feet at 8 seconds. Isolated showers.

Tuesday night - Southeast winds 15 to 20 knots. Seas 4 to 5 feet. Wave detail: east southeast 5 feet at 7 seconds. Scattered showers.

Wednesday - East southeast winds 15 to 20 knots. Seas 4 to 5 feet. Wave detail: east southeast 5 feet at 7 seconds. Isolated showers in the morning.

Wednesday night - East southeast winds 15 to 20 knots. Seas 4 to 5 feet. Wave detail: east southeast 5 feet at 7 seconds. Isolated showers.

Thursday - East southeast winds 15 to 20 knots, rising to 20 to 25 knots in the afternoon. Seas 4 to 5 feet. Wave detail: east southeast 5 feet at 7 seconds. Isolated showers in the morning.

Thursday night - East southeast winds 15 to 20 knots. Seas 4 to 5 feet. Wave detail: east southeast 5 feet at 7 seconds. Isolated showers.

Friday - East southeast winds 15 to 20 knots, rising to 20 to 25 knots in the afternoon, easing to 15 to 20 knots. Seas 4 to 6 feet. Wave detail: east southeast 5 feet at 7 seconds. Isolated showers in the morning. Isolated showers through the day.

Saturday - East southeast winds 15 to 20 knots, easing to 10 to 15 knots. Seas 5 to 6 feet. Wave detail: east southeast 4 feet at 7 seconds and northwest 3 feet at 14 seconds. Isolated showers through the night. Scattered showers through the day.
PHZ100 316 Pm Hst Mon Apr 21 2025

Synopsis for hawaiian coastal waters - High pressure far northeast of hawaii will gradually weaken. A deep low will form far northwest of hawaii on Tuesday. Moderate to locally fresh easterly trade winds will ease this evening then veer to the south or southeast by Tuesday afternoon. Chance of heavy showers or Thunderstorms Tuesday through Thursday.

7 Day Forecast for Marine Location Near Nanawale Estates, HI
   
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Tide / Current for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
  
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Tide / Current data from XTide NOT FOR NAVIGATION        
  Sorry, Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii does not exist in database. Press Edit above and select a valid nearby location.

Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii, Tide feet

Tide / Current for Honuapo, Hawaii Island, Hawaii
  
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Honuapo
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Mon -- 01:37 AM HST     Moonrise
Mon -- 06:00 AM HST     Sunrise
Mon -- 06:18 AM HST     0.13 feet Low Tide
Mon -- 11:39 AM HST     1.06 feet High Tide
Mon -- 12:56 PM HST     Moonset
Mon -- 04:05 PM HST     0.39 feet Low Tide
Mon -- 06:41 PM HST     Sunset
Mon -- 11:12 PM HST     2.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, Honuapo, Hawaii Island, Hawaii does not exist in database. Press Edit above and select a valid nearby location.

Honuapo, Hawaii Island, Hawaii, Tide feet
12
am
2
1
am
1.6
2
am
1.2
3
am
0.8
4
am
0.5
5
am
0.2
6
am
0.1
7
am
0.2
8
am
0.4
9
am
0.6
10
am
0.9
11
am
1
12
pm
1
1
pm
0.9
2
pm
0.7
3
pm
0.5
4
pm
0.4
5
pm
0.4
6
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0.6
7
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0.9
8
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1.3
9
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1.7
10
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2
11
pm
2.2

Area Discussion for Honolulu, HI
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FXHW60 PHFO 220158 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 358 PM HST Mon Apr 21 2025

SYNOPSIS
Trades will dissipate tonight as a deepening low to the far northwest of the state drifts southward and lingers west of the state the next several days. Southerly winds will help to bring increased showers across the state. Unsettled weather conditions are expected Tuesday through Wednesday with scattered showers across the state especially during the afternoons. Heavier showers and isolated thunderstorms will be possible around Kauai late Tuesday into Wednesday.

DISCUSSION
This afternoon's satellite and radar imagery shows scattered showers across leeward areas. These showers should decrease this evening as we lose day time heating. Trades will begin to dissipate tonight as a low pressure system approaches the state from the northwest.

A surface low pressure system, coupled with its associated upper level low, is northwest of the islands, and this will be the focus for our next weather event. This system is expected to strengthen as it sinks southward over the next few days, bringing with it a round of somewhat unstable and wet weather to the islands. There is good agreement with the GFS and ECMWF that both the surface and upper level lows will remain to the west of the islands. This means that Kauai will have the greatest chance for heavy showers and isolated thunderstorms that will be associated with the system. With above normal precipitable water (PW) values of around 1.5 to 1.7 inches and some marginal instability (500 mb temps of around -10C) the atmosphere will be more than capable of producing periods of heavy rain. Although the latest ensemble guidance is in fairly good agreement with the main moisture axis staying just west of Kauai, we decided to go with a Flood Watch for Kauai due to some of the National Water models showing a few streams approaching critical levels. With the flow beginning to veer toward the south tonight, we should begin to see an increase of showers tonight. But the best chance for the heaviest showers and isolated thunderstorms will likely be Tuesday afternoon through Wednesday morning.

For rest of the state, moist southerly flow will produce humid conditions and scattered showers. With the added moisture, some brief downpours are possible especially during the afternoon and evening hours. Widespread rainfall is not expected for rest of the state, but some showery conditions will be possible at times.

Thursday into Friday, the upper level low should lift further north and away from the state which should bring the return of stable conditions, although somewhat unsettle weather may continue near Kauai. Winds will continue to remain light to moderate and out of the southeast direction, which will produce warm and humid conditions through the rest of the week. Trade winds should return sometime during the first half of next week.



AVIATION
Light to moderate trade winds will continue through the evening, ushering in a few brief showers to windward and mountain areas.
Winds have been light enough to support sea breeze activity this afternoon, bringing clouds a few showers to leeward and interior areas (particularly across the Big Island). Winds will remain light enough for land breezes to develop overnight and help to clear out leeward and interior areas.

Tomorrow, winds will veer out of the south in advance of a developing low pressure system to the northwest of Kauai. This flow will focus showers over south-facing coasts and slopes, along with some sea breeze development bringing clouds and a few showers to north and east-facing coasts and slopes as well. The proximity of the low will enhance showers and bring the potential for isolated thunderstorm activity to the western end of the state beginning tomorrow afternoon.

MVFR conditions will be possible in any showers, otherwise VFR should prevail.

No AIRMETs are currently in effect.

MARINE
High pressure far northeast of Hawaii will gradually weaken as a surface through roughly 600 nm northwest of Kauai deepens into a complex low. In response, moderate to locally fresh easterly trade winds will ease this evening then veer to the southeast by tomorrow afternoon. The primary low center is expected to become anchored 400 nm northwest of Kauai Tuesday afternoon, causing winds over the western end of the state to further veer to the south. Near the Big Island and Maui, southeast winds will increase to moderate to fresh levels, likely necessitating a Small Craft Advisory (SCA) Wednesday through Friday. The low will also bring a chance of heavy showers and thunderstorms, mainly over the western end of the island chain.

Small surf is expected along north shores through this evening. A tiny, medium period northwest swell will fill in later tonight and provide a small boost in surf into Wednesday. Minimal surf is expected later Wednesday through Friday, followed by another small pulse of northwest swell next weekend.

South shore surf will be remain small through this evening. A small, long period south-southwest swell is expected to arrive late tonight, pushing surf along south facing shores above summer average. The swell will hold through Wednesday, then decline Thursday and Friday.

Surf along east facing shores will remain near or below average due to the lack of strong trade winds over or upstream of the islands.

HFO WATCHES/WARNINGS/ADVISORIES
Flood Watch from Tuesday afternoon through Wednesday afternoon for Niihau-Kauai-




Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
ILOH1 - 1617760 - Hilo, HI 21 mi44 minS 4.1G6


Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
   
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
PHTO HILO INTL,HI 20 sm39 minS 0410 smOvercast73°F64°F73%30.02

Weather Map
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GEOS Local Image of Hawaii  
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