Thursday, April2, 2020
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Marine Weather and Tides
Laupahoehoe, 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 6:12AMSunset 6:35PM Wednesday April 1, 2020 9:10 PM HST (07:10 UTC) Moonrise 12:18PMMoonset 1:09AM Illumination 68% Phase: Waxing Gibbous; Moon at 9 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- 335 Pm Hst Wed Apr 1 2020
Tonight..East winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 to 5 feet. Isolated showers through the night.
Thursday..East winds 15 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Isolated showers through the day.
Thursday night..Southeast winds 15 knots. Wind waves 4 feet. Mixed swell northwest 3 feet and east 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..Southeast winds 20 knots. Wind waves 5 feet. SWell east 4 feet. Scattered showers.
Friday night..Southeast winds 20 knots. Wind waves 5 feet. SWell east 4 feet. Scattered showers.
Saturday..Southeast winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet in the afternoon. SWell east 4 feet. Scattered showers.
Saturday night..Southeast winds 15 knots. Wind waves 5 feet. Mixed swell northwest 5 feet and east 4 feet. Scattered showers.
Sunday..East winds 15 knots. Wind waves 4 feet. Mixed swell northwest 4 to 5 feet and east 3 to 4 feet. Scattered showers.
Monday..Southeast winds 10 knots. Wind waves 3 feet. Mixed swell northwest 4 feet and east 3 feet. Scattered showers.
PHZ100 335 Pm Hst Wed Apr 1 2020
Synopsis for hawaiian coastal waters.. A high far northeast of the area and a weak trough over the eastern offshore waters will maintain gentle to locally fresh wind speeds through the weekend. Winds will veer out of the southeast starting tomorrow as a front approaches from the northwest.


7 Day Forecast for Marine Location Near Laupahoehoe, HI
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location: 20.8, -154.34     debug


Area Discussion for -
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FXHW60 PHFO 020632 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 832 PM HST Wed Apr 1 2020

SYNOPSIS. Deep low pressure moving in from far northwest of the state on Thursday and Friday will cause trade winds to veer out of the southeast, leading to a somewhat unstable land and sea breeze regime that will produce spotty showers, briefly heavy at times, over each island in the afternoon to early evening hours. Winds will turn more southerly on Friday and the weekend, likely drawing up deeper moisture over the islands and fueling more shower activity. A convergent cloud band with the low will develop over the state starting Friday night keeping unsettled weather in the long range forecast through Tuesday.

DISCUSSION. The satellite picture this evening shows an upper level low east of the main Hawaiian Islands and a low level trough moving westward through Kauai producing a slight enhancement for showers over Kauai County. On the radar imagery conditions appear fairly stable with passing isolated showers outside of the showers near Kauai. A strong low pressure system roughly 1300 miles north- northwest of Kauai will approach the islands over the next few days, potentially delivering additional wet weather impacts to the state on Saturday and Sunday.

A light east to southeast wind regime will continue for the next several days as a low pressure area north of the island chain continues to displace the high pressure ridge that normally lingers north of the region. Expect land and sea breezes to continue over all islands through Friday. Sea breeze convergence over each island will cause clouds and showers to develop during the day favoring afternoon to early evening hours. Overnight divergent land breezes will bring improving weather conditions over each island will diminishing cloud cover. Short range forecast guidance through Friday shows the subsidence inversion heights around the 7000 to 8000 foot level, enough for scattered shower activity, however the southeasterly background wind flow may limit shower production along eastern slopes as clouds tend to move more parallel to the island chain.

The weather pattern changes this weekend as a large low pressure system drifting in from the north becomes cut off from the mid latitude steering flow. This low will slow down and become stationary roughly 900 miles northwest of Kauai on Friday. Initially a cold front out ahead of the low will approach the islands before losing forward motion as it weakens. A low level convergent cloud band will form over the islands, between the southerly and southeasterly winds, out ahead of the diminishing frontal boundary. Winds over the western half of the state will become light southerlies bringing up deep and unstable tropical moisture from the south by Friday afternoon onward. Shower activity will trend higher from Friday into the weekend especially over the western half of the state and along the southeastern slopes of the Big Island from Kau to Puna. Additional moister and instability within this convergent band may lead to heavy showers at times with isolated thunderstorms. Medium range model guidance between the American (GFS) and European (ECMWF) is in good agreement through Sunday.

Longer range model guidance diverges a bit from Monday onward with the GFS showing a drying trend from Monday into Wednesday as the southern tail of this convergence band drifts east, while the ECMWF model keeping the convergent band with enhanced showers lingering over the islands through the middle of next week. Predicting where the tail of this cloud boundary will end up this far out remains challenging for the long range precipitation forecast.

AVIATION. Mostly a nighttime land breeze, daytime sea breeze scenario into Thursday. Instability and light trades will keep the chance for isolated showers tonight, especially over Kauai and on windward coasts and slopes. Mountain obscuration should be brief and passing but will issue AIRMET Sierra for mountain obscuration if necessary.

Thursday afternoon inland areas again could see showers, especially on the Big Island with sea breeze activity, some of which could be heavy.

No AIRMETS are in effect at this time.

MARINE. A surface high far northeast of the area is maintaining easterly trade winds across Hawaiian waters, but a trough over the Kauai Channel will keep the winds gentle to locally fresh though Thursday.

A low south of the Aleutians is forecast to move south and approach the area, causing winds to veer out of the southeast tomorrow. Winds will weaken over the western part of the coastal and offshore waters but winds may strengthen over eastern waters, especially where the southeast flow accelerates around the Big Island and Maui. Winds could even reach Small Craft Advisory speeds over the Big Island windward waters and Big Island leeward waters off South Cape.

A convergence band associated with the low will likely move over the northwest offshore waters Saturday. Winds will veer out of the south and a chance of thunderstorms will develop.

The current small northwest swell will continue subsiding through Friday night. A new swell building Saturday will produce moderate surf along north and west shores over the weekend, but is expected to remain well below the advisory threshold. Swells from the southeast Pacific are partly blocked by the islands of French Polynesia, but the current swell is coming through a narrow swell window. This swell will maintain elevated surf on the south shores through tomorrow, but surf will remain below the advisory threshold. Surf along east shores will remain up through midweek due to an upstream fetch, despite the trades relaxing locally, then subside by the end of the week.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Bohlin AVIATION . Chevalier MARINE . Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 83 mi53 min W 2.9 G 4.1 71°F 77°F1013.4 hPa

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, HI84 mi78 minW 410.00 miA Few Clouds72°F64°F79%1014.5 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSW4CalmSW3SW4SW5CalmSW4SW5SW6SW4W3CalmCalm4NE3NE5NE10NE10E5NE6NE3CalmW4S3
1 day agoSW3W3SW4SW5SW4SW4SW3CalmN3SW3SW5N10W6--NW5N5N5N8NW5CalmW4CalmSW4S4
2 days agoCalmSE3SW3CalmCalmCalmCalmCalmSW5SE3SW5SW6SW6SW6CalmS3NE12NE9NE6NE5E4E3CalmS3

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Thu -- 02:10 AM HST     Moonset
Thu -- 05:59 AM HST     0.10 feet Low Tide
Thu -- 06:15 AM HST     Sunrise
Thu -- 11:12 AM HST     1.06 feet High Tide
Thu -- 01:25 PM HST     Moonrise
Thu -- 03:48 PM HST     0.16 feet Low Tide
Thu -- 06:38 PM HST     Sunset
Thu -- 11:22 PM HST     2.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.71.20.80.40.20.10.20.40.711.110.80.50.20.20.30.50.91.41.82.12.3

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 (3,6,7,8)
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Ground Weather Radar Station Kohala, HI
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Disclaimer:
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.