Sunday, March29, 2020
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Marine Weather and Tides
Wainaku, HI

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:14AMSunset 6:35PM Sunday March 29, 2020 8:08 AM HST (18:08 UTC) Moonrise 9:52AMMoonset 11:20PM Illumination 31% Phase: Waxing Crescent; Moon at 6 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- 328 Am Hst Sun Mar 29 2020
Today..East winds 20 knots. Wind waves 7 feet. Scattered heavy showers and slight chance of Thunderstorms.
Tonight..East winds 20 knots. Wind waves 6 feet. Slight chance of Thunderstorms in the evening. Scattered showers through the night.
Monday..East winds 15 knots. Wind waves 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Monday night..East winds 10 knots. Wind waves 5 feet. Scattered showers.
Tuesday..East winds 10 knots. Wind waves 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tuesday night..East winds 10 knots. Wind waves 4 feet. Northwest swell 3 feet. Scattered showers.
Wednesday..East winds 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Scattered showers.
Thursday..Southeast winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet. Showers likely.
PHZ100 328 Am Hst Sun Mar 29 2020
Synopsis for hawaiian coastal waters.. High pressure north of the islands will weaken as it slides eastward through the middle of next week. This will lead to a gradual easing of the trade winds across the marine area. A trough of low pressure aloft will keep a slight chance of Thunderstorms in place through this evening.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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FXHW60 PHFO 291445 CCA AFDHFO

Area Forecast Discussion . CORRECTED National Weather Service Honolulu HI 445 AM HST Sun Mar 29 2020

SYNOPSIS. The threat for heavy rainfall and a few thunderstorms will remain in the forecast today due to an upper disturbance in the area. Most of this activity will favor windward and mountain locations with moderate to breezy trades in place. Drier air expected to fill in tonight into Monday will likely allow more of a typical trade wind pattern to briefly return. Rainfall chances will trend back up by midweek as another upper disturbance moves into the area. Trade winds are forecast to become disrupted through this time as a surface trough develops, which should be enough for a land and sea breeze regime to setup Wednesday through Friday. A cold front will approach and move into the area by next weekend.

DISCUSSION. Water vapor imagery showed an upper trough extending west- southwestward over the region from an upper low centered north- northeast of the islands. At the surface, the trough that was positioned near Niihau and Kauai that was a focus for the heavy rainfall Friday night into Saturday has drifted well west of the area this morning. Although more of a trade wind pattern has returned, the threat for heavy windward showers and even a storm or two still exists with the upper trough in place today. Any activity that setups up and focuses over Kauai for any duration will only aggravate the sensitive areas - given the saturated grounds and swollen streams from yesterday's heavy rainfall (8-11 inches in the past 48-hrs). As a result, the Flash Flood Watch has been extended for Kauai County today. The short-term guidance remains in decent agreement and shows the aforementioned surface trough continuing westward and away from the area. The upper low centered near Kauai has opened up and will become absorbed into the broad upper low north-northeast of the islands tonight into Monday. This combined with some drier air filling in will likely allow more of a typical trade wind pattern to briefly return tonight through Monday.

For the extended, a general consensus depicts upper heights lowering once again as another upper trough digs southward into the area. Despite the differences shown between the various model solutions, all show a surface trough emerging over the islands in response to the upper height falls. This will translate to increasing moisture and rainfall coverage across the islands. Although it remains too early to pinpoint the details, the threat for heavy rainfall and thunderstorms will become a possibility where this activity becomes focused for any duration. Trade winds will become disrupted, which should be enough for a land and sea breeze regime to setup Wednesday through Friday. This setup would favor showers setting up over interior areas of the islands through the afternoon hours. Although large timing differences are shown for next weekend, all solutions depict a front approaching and moving into the area. If this front sweeps down the island chain, drier and cooler conditions will become a possibility, especially over the western end of the island chain. If it hangs up to the west of the state, more of a wet pattern will be possible.

AVIATION. A sufficient amount of instability will support heavy showers and a few thunderstorms today, especially this afternoon with daytime heating. Otherwise, mid level ridging will continue to build over the area resulting in a low level inversion at around 8k feet over most islands by this afternoon.

The pocket of heavy showers in the vicinity of Hilo is breaking apart so AIRMET Sierra for mountain obscuration will likely be lowered by 6 am HST. Ditto for the Koolau Mountains on Oahu as the frequency of showers continue to subside. AIRMET Sierra, however, will continue on Kauai as scattered showers continue to roll in with the trades. Perhaps by 18z, these showers will back off enough so to cancel Sierra. Sierra could be needed this afternoon due to the reasoning described above.

Trades have filled in nicely area-wide and will maintain moderate to locally strong through today. The trades are being supplied by a 1030 mb surface high currently located far north of Kauai. Strength of the trades will be trending weaker starting tonight as the high heads toward the southeast. Expect AIRMET Tango for low level turbulence to be lowered sometime after 04z.

Other than for Kauai, VFR condition will be the prevailing flying weather for today. Scattered trade showers riding in with the trades will briefly lower the ceiling and vis, which will be favoring the windward and mountain areas. Afternoon heating will lead to broken to overcast clouds and a few showers over the lee slopes of the Big Island this afternoon as well. AIRMET Sierra is not expected, however. Expect cloud tops between 10 and 15k feet.

Dense high level cirrus will persist over the island skies today. Some thinning may come late this afternoon.

MARINE. High pressure north of the state will keep moderate to strong trade winds in place through Monday. The trades have strengthened slightly overnight, so a Small Craft Advisory (SCA) is now in effect for the typically windy waters around Maui and the Big Island through tonight. The trades will ease into the light to moderate range Tuesday through Wednesday, and become variable across much of the marine area by Thursday. The wind forecast Friday into next weekend remains highly uncertain at this time.

Trade winds over and upstream of the islands will keep advisory level surf going through this afternoon, and a High Surf Advisory remains in effect through 6 PM this evening. East shore surf is expected to drop below advisory levels by tonight, with a very slow and gradual downward trend then expected through the week. A small west- northwest swell is expected to give surf a boost along north and west facing shores Tuesday through Thursday. Small south and southwest swells will continue to keep some surf in place through the week along south facing shores, with a slightly larger south- southeast swell expected boost surf heights a bit Wednesday night through Friday night.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Advisory until 6 PM HST this evening for Kauai Windward-Oahu Koolau-Olomana-Molokai Windward-Maui Windward West- Windward Haleakala-South Big Island-Big Island North and East.

Small Craft Advisory until 6 AM HST Monday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Gibbs AVIATION . H Lau MARINE . Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi69 min SSW 1.9 G 2.9 67°F 76°F1015.9 hPa (+1.3)
51206 6 mi53 min 75°F8 ft
KWHH1 46 mi69 min NE 2.9 G 5.1 73°F 77°F1015.8 hPa (+1.1)

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, HI1 mi76 minSW 410.00 miMostly Cloudy69°F63°F81%1017.4 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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1 day agoCalm4SE10S6N5SE4CalmCalmCalmCalmW3W7SW6SW5SW73W6SW7W6NW5NW5SW5SW3Calm
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Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Sun -- 01:14 AM HST     0.54 feet Low Tide
Sun -- 05:28 AM HST     1.19 feet High Tide
Sun -- 06:15 AM HST     Sunrise
Sun -- 09:51 AM HST     Moonrise
Sun -- 11:28 AM HST     0.19 feet Low Tide
Sun -- 06:33 PM HST     Sunset
Sun -- 07:08 PM HST     2.05 feet High Tide
Sun -- 11:19 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.60.811.21.21.10.80.60.30.20.20.40.611.41.72221.81.51.2

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sun -- 01:54 AM HST     0.56 feet Low Tide
Sun -- 06:18 AM HST     Sunrise
Sun -- 06:36 AM HST     1.01 feet High Tide
Sun -- 09:54 AM HST     Moonrise
Sun -- 12:29 PM HST     0.18 feet Low Tide
Sun -- 06:37 PM HST     Sunset
Sun -- 07:57 PM HST     1.95 feet High Tide
Sun -- 11:23 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.60.60.60.80.9110.90.70.50.30.20.20.30.611.31.71.91.91.91.71.4

Weather Map
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wmap_P
GEOS Local Image of Hawaii    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (14,3,4,5)
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Ground Weather Radar Station Kohala, HI
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.