Wednesday, April8, 2020
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Marine Weather and Tides
Kalaoa, 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 6:07AMSunset 6:37PM Tuesday April 7, 2020 7:59 PM HST (05:59 UTC) Moonrise 6:43PMMoonset 6:10AM Illumination 100% Phase: Full Moon; Moon at 15 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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PHZ123 Big Island Leeward Waters- 312 Pm Hst Tue Apr 7 2020
Tonight..South winds 10 knots. Wind waves 3 feet. Northwest swell 4 feet and northwest 4 feet. Isolated showers after midnight.
Wednesday..South winds 10 knots. Wind waves 3 feet. Northwest swell 5 feet. Isolated showers in the morning.
Wednesday night..South winds 10 knots in the evening becoming variable less than 10 knots. Wind waves 3 feet in the evening then 2 feet or less. Northwest swell 4 feet. Scattered showers.
Thursday..South winds 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Scattered showers.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 4 feet. Scattered showers.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Scattered showers.
Saturday..West of the big island, winds variable less than 10 knots becoming north 10 knots after midnight. NEar kawaihae, winds variable less than 10 knots. Wind waves 2 feet or less. Northwest swell 3 feet. Isolated showers.
Sunday..West of the big island, winds variable less than 10 knots. NEar south point, winds variable less than 10 knots becoming east 10 knots. Wind waves 3 feet. Northwest swell 3 feet. Isolated showers.
PHZ100 312 Pm Hst Tue Apr 7 2020
Synopsis for hawaiian coastal waters.. Low pressure centered far north of the state will maintain mainly light to gentle southerly to westerly winds over coastal waters through Saturday. A dissipating front will move eastward over the islands tonight and Wednesday. Another weak front is expected to reach the islands Saturday night and Sunday, producing a short period of north winds. High pressure following the front should bring a return to trade winds late Sunday.


7 Day Forecast for Marine Location Near Kalaoa, HI
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location: 19.75, -156.05     debug


Area Discussion for -
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FXHW60 PHFO 080128 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 328 PM HST Tue Apr 7 2020

SYNOPSIS. Light and variable winds will persist through the week. A trough stalled over the islands will provide for partly cloudy skies and scattered showers into the weekend. Trade winds may return by the end of the weekend and next week.

DISCUSSION. A weak surface trough near Maui County and the Big Island is bringing clouds and showers over windward Haleakala and areas south of Hilo this afternoon. Sea breezes across the rest of the state have created some partly cloudy skies, but little rain has fallen with fairly stable atmospheric conditions taking hold. The surface trough and weak synoptic flow over the area will allow for those afternoon sea breezes and nighttime land breezes to continue through the week. Expect afternoon convective clouds with embedded showers to pop up mainly over interior areas.

A weak frontal boundary moving in the from the NW on Wednesday will join with the trough near Maui and add a some low level moisture to the mix. This will increase shower coverage a notch with a focus over the central islands. However, warming is expected aloft tonight into Thursday, so heavy rain or thunderstorms are not expected during this time frame. Friday, temperatures aloft are expected to cool again as a short wave trough moves through, bringing the potential of more vigorous showers into Saturday.

In the longer term forecast, models are depicting a weak cold front reaching Kauai Saturday and stalling over the central islands Sunday bringing increased clouds and showers. High pressure behind the front would then swing our winds around to light northwesterlies Saturday and moderate northeast trade winds on Sunday that look to continue into next week.

AVIATION. Cloud cover has increased with sea breezes across interior sections of the island chain this afternoon. The Big Island has seen the majority of the cloud and shower activity and also has a high SCT- BKN deck moving over from the southwest. While there have not been any thunderstorms as of yet, an isolated rumble is still possible before the afternoon is over. VFR conditions prevail with tempo MVFR possible with shower activity.

Showers look to increase tomorrow as a weakening front moves down the island chain with light winds continuing. No AIRMETs are in effect or anticipated.

MARINE. Low pressure centered far north of the state will maintain mainly light to gentle southerly to westerly winds over coastal waters through Saturday. A diffuse and dissipating front will move eastward across the islands tonight and Wednesday, and another shallow front is expected to move down parts of the island chain Saturday night and Sunday, producing a short period of gentle to locally moderate north winds. High pressure following the front should bring a return to trade winds late Sunday or Monday. Trades could persist through the middle of next week as the GFS and ECMWF show a surface ridge holding just north of the state.

Moderate surf is due along north facing shores into the weekend. For today, surf in the slightly overhead range is being generated by a combination of a long-period west-northwest swell from a distant source and medium-period north-northwest swell from the closer system that is cutting off the local trade winds. The distant swell will fade over the next day or so, but the shorter period north-northwest swell will build slightly tonight and Wednesday and again to around 6 to 7 ft at 12 seconds on Friday before declining during the weekend.

Surf along south and east facing shores will remain rather small through much of the upcoming week. Mainly background south to south-southeast swells will affect south facing shores. With trades disrupted locally and the trade wind fetch east of the islands suppressed, surf along east facing shores will be well below April normal. East shore surf is expected to build early next week with trades forecast to return.

HFO WATCHES/WARNINGS/ADVISORIES. None.



DISCUSSION . Morrison AVIATION . Dye MARINE . Wroe


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 23 mi59 min NW 6 G 8 77°F 79°F1014.4 hPa (+2.2)
ILOH1 - 1617760 - Hilo, HI 53 mi59 min SSE 6 G 8 72°F 77°F1013 hPa (+1.8)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 82 mi59 min NE 4.1 G 5.1 77°F 78°F1014.3 hPa (+1.9)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI7 mi66 minW 510.00 miPartly Cloudy79°F69°F72%1014.1 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrSW9S8CalmNE5NE3SE6SE6SE3SE5SE5E3S3W4W5W5NW9W11W8W8W7W7W5W5NW5
1 day agoN9N8N5N6NE3N6N7N8NE6NE5N7NE8SW56W7SW5S8SW10SW8W8SW7S9S9S8
2 days agoSE3SE3SE5CalmSE5SE5CalmE5E4E4NE4N7NW7NW8NW9NW13NW15NW12NW11NW10N8NW9N8N7

Tide / Current Tables for Kailua Kona, Big Island, Hawaii (2)
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Kailua Kona
Click for Map
Wed -- 03:43 AM HST     1.51 feet High Tide
Wed -- 06:11 AM HST     Sunrise
Wed -- 06:54 AM HST     Moonset
Wed -- 09:56 AM HST     -0.34 feet Low Tide
Wed -- 04:30 PM HST     1.94 feet High Tide
Wed -- 06:40 PM HST     Sunset
Wed -- 07:47 PM HST     Moonrise
Wed -- 10:57 PM HST     -0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.81.21.41.51.310.50.1-0.2-0.3-0.20.20.71.21.71.91.91.71.30.80.40.1-0

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Wed -- 03:49 AM HST     1.56 feet High Tide
Wed -- 06:11 AM HST     Sunrise
Wed -- 06:54 AM HST     Moonset
Wed -- 10:01 AM HST     -0.24 feet Low Tide
Wed -- 04:33 PM HST     1.96 feet High Tide
Wed -- 06:40 PM HST     Sunset
Wed -- 07:47 PM HST     Moonrise
Wed -- 10:57 PM HST     0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.81.21.51.61.41.10.60.2-0.1-0.2-0.10.20.71.21.71.91.91.71.30.90.50.20.1

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 (1,6,7,8)
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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.