Tuesday, April20, 2021
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Marine Weather and Tides
Honomu, HI

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:57AMSunset 6:40PM Monday April 19, 2021 11:51 PM HST (09:51 UTC) Moonrise 11:43AMMoonset 12:35AM Illumination 60% Phase: Waxing Gibbous; Moon at 8 days in cycle
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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PHZ122 Big Island Windward Waters- 851 Pm Hst Mon Apr 19 2021
Rest of tonight..Southeast winds 20 knots. Wind waves 6 feet. North swell 3 feet. Isolated showers.
Tuesday..Southeast winds 20 knots. Wind waves 5 feet. North swell 3 feet. Isolated showers.
Tuesday night..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Wednesday..East winds 15 knots. Wind waves 4 feet. Isolated showers.
Wednesday night..East winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Thursday..East winds 15 knots. Wind waves 4 feet. Northwest swell 4 feet. Isolated showers.
Thursday night..East winds 15 knots. Wind waves 4 feet. Northwest swell 4 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 feet. Northwest swell 3 to 4 feet. Scattered showers.
Saturday..East winds 15 knots. Wind waves 5 feet. Northwest swell 3 feet. Scattered showers.
PHZ100 851 Pm Hst Mon Apr 19 2021
Synopsis for hawaiian coastal waters.. A front approaching from the northwest will keep winds on the lighter side, particularly over the western islands through Wednesday. As the front weakens into a trough and dissipates Wednesday night and Thursday, trade winds will return, and strengthen to fresh to strong levels Friday into the weekend.


7 Day Forecast for Marine Location Near Honomu, HI
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location: 20.04, -155     debug


Area Discussion for -
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FXHW60 PHFO 200635 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 835 PM HST Mon Apr 19 2021

SYNOPSIS. Light and variable winds will prevail the next couple of days, with trade winds gradually strengthening Wednesday and Thursday before becoming breezy next weekend. The light winds will allow low clouds and showers to focus over interior locations during the day, but an overall increase in showers is expected through Tuesday over Kauai and Oahu as an upper-level disturbance moves through, with a few heavy showers possible. The upper-level disturbance will also bring a thick layer of mid and high clouds on Tuesday that will gradually diminish on Wednesday. The returning trade winds will bring just a few windward showers.

DISCUSSION.

Weakly convergent southeast flow is supporting scattered showers around Kauai while mostly clear skies and dry weather prevail for all other islands. Aside from a gradual increase in mostly transparent high cloud cover, this should generally remain the trend through most of the night.

The afternoon sounding out of Lihue was very dry in the mid-levels and featured a PWAT of 0.87", which is on the low side of normal for April. Likewise, dewpoints at Barking Sands were in the upper 50s as recently as this morning. However, the dewpoint there has jumped up to 70 degrees over the last couple of hours which corresponds to a satellite analysis of PWATs up to 1.4" spreading over Kauai at press time. As this airmass filters into the area during the next 12 to 18 hours a similar increase in surface humidity can be expected for the other islands. This will represent a noticeable increase in mugginess compared to the last couple of weeks.

Attention for the evening forecast package revolves around shower coverage and heavy rain potential on Tuesday. Model consensus has held firm over the last 24 hours or so with no forecast changes needed and no substantial revisions to overall forecast reasoning. Advection of warm and moist air within a deep layer of confluent southwesterly flow will contribute to modest forcing for ascent through the forecast period while a fairly dynamic 60kt jet provides favorable support by Tuesday afternoon. With that said, the potential for deep convection and thunderstorms is expected to be limited due to paltry mid level lapse rates and increasing high clouds limiting instability over the islands. The greatest potential for deep inland convection will probably be over Maui and Big Island where high clouds are not expected to arrive until later Tuesday evening. Overall flavor of the event is still expected to be one of increasing shower coverage and locally heavy rainfall for portions of Kauai and Oahu.

A building ridge over the central Pacific will cause a return to trades by the end of the week. The returning trade winds will be on the drier side as a building mid-level ridge brings stability, although there may be a weak low aloft bringing more trade showers over the weekend. Long range outlook shows a trend toward light winds in about a week or so.

AVIATION. The cold front far northwest of the Hawaiian Islands continues its slow march eastward. Light mostly offshore winds will predominate across the islands tonight. Winds will shift to the south on Tuesday as the front edges closer to Kauai. Current radar imagery reveals minimal shower activity statewise this evening. Shower coverage and intensity is expected to increase over Kauai late tonight or early Tuesday, but the remainder of the state should experience mostly clear skies overnight.

Prefrontal showers will spread from Kauai to Oahu by Tuesday afternoon and to Maui County by Tuesday evening. On the Big Island, inland cumulus are expected to dissipate overnight, but redevelop Tuesday afternoon.

The air mass over the state is expected to become increasingly unstable on Tueday. Slight chance of Thunderstorms over Kauai, Oahu, and Interior Big Island on Tuesday.

No AIRMETs in effect at this time. Mountain obscuration could become an issue for Kauai on Tuesday.

MARINE.

A front approaching from the northwest will keep moderate east- southeast winds in place over the eastern islands and light and variable winds over the western end of the state through Wednesday. A few heavy showers and even a thunderstorm will be possible through Tuesday evening over the Kauai and Oahu waters as an upper level disturbance moves through. Moderate trades are expected to return from east to west across the state Wednesday night and Thursday as high pressure builds north of the islands. The trades are forecast to strengthen into the fresh to strong range Friday through the weekend, and Small Craft Advisories will likely be needed for some marine zones at that time.

Surf along north facing shores will remain small through Tuesday. A new short period north-northwest swell will then give north shore surf a boost during the middle of the week, with a slow decline expected Friday through the weekend. Head high to slightly over head sets can be expected along north facing shores as this swell peaks, but surf will remain well below advisory thresholds.

East shore surf will remain small through the next 7 days, although we should see a slow trend upward Thursday into the weekend as the trades over and upstream of the islands strengthen.

Surf along south facing shores will remain small during the next 7 days, with mainly background south and south- southwest swell energy moving through.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . JVC AVIATION . Bedal MARINE . Jelsema


Weather Reporting Stations
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On 03/09/2021 the NDBC primary processing servers were shut off due to a facilities issue. Station pages on the NDBC website are not updating and there is no ETR at this time. We will update this banner as we learn more.
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51206 18 mi38 min 76°F6 ft
ILOH1 - 1617760 - Hilo, HI 22 mi51 min SSW 2.9 G 5.1 71°F 77°F1018.5 hPa (+0.8)
KWHH1 44 mi51 min NE 1.9 G 2.9 75°F 79°F1018.5 hPa (+0.8)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 98 mi51 min W 2.9 G 4.1 74°F 79°F1018.7 hPa (+1.2)

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI22 mi58 minSSW 410.00 miFair72°F63°F73%1019.6 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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1 day agoSE5S4W5SW5SW5SW5S4SW4CalmE3NE6NE8NE12E11E10NE10--NE10SE6SW5CalmCalmS4S4
2 days agoSW3SW3SW4SW6SW4SW4SW5SW5SW3Calm6NE7NE11NE8NE7N6N8NE7N6N3NW11W6W7SW4

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Tue -- 01:24 AM HST     Moonset
Tue -- 05:42 AM HST     0.19 feet Low Tide
Tue -- 05:58 AM HST     Sunrise
Tue -- 10:56 AM HST     1.00 feet High Tide
Tue -- 12:39 PM HST     Moonrise
Tue -- 03:04 PM HST     0.40 feet Low Tide
Tue -- 06:40 PM HST     Sunset
Tue -- 10:32 PM HST     2.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.410.60.40.20.20.30.50.80.910.90.70.50.40.40.60.91.31.61.92.12.1

Tide / Current Tables for Hilo, Hilo Bay, Hawaii
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Hilo
Click for Map
Tue -- 01:24 AM HST     Moonset
Tue -- 05:58 AM HST     Sunrise
Tue -- 06:07 AM HST     0.62 feet Low Tide
Tue -- 10:03 AM HST     0.79 feet High Tide
Tue -- 12:39 PM HST     Moonrise
Tue -- 03:15 PM HST     0.40 feet Low Tide
Tue -- 06:40 PM HST     Sunset
Tue -- 11:03 PM HST     2.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.81.61.310.80.70.60.60.70.80.80.80.70.60.50.40.40.60.81.11.51.822.1

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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