Wednesday, April1, 2020
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Marine Weather and Tides
Heeia, 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 6:22AMSunset 6:47PM Wednesday April 1, 2020 10:16 AM HST (20:16 UTC) Moonrise 12:32PMMoonset 1:25AM Illumination 63% 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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PHZ116 Kaiwi Channel- 956 Am Hst Wed Apr 1 2020
Rest of today..Northeast winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Isolated showers.
Tonight..East winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Isolated showers.
Thursday..East winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet.
Thursday night..East winds 10 knots. Wind waves 3 feet. Mixed swell northwest 3 feet and east 4 feet. Isolated showers after midnight.
Friday..Southeast winds 10 knots. Wind waves 3 feet in the morning then 2 feet or less. Isolated showers.
Friday night..East winds 15 knots veering south after midnight. Wind waves 3 feet. Northwest swell 3 feet after midnight. Isolated showers.
Saturday..South winds 10 knots backing northeast in the afternoon, then veering south. Wind waves 3 feet. Northwest swell 4 to 6 feet. Isolated showers.
Sunday..Southeast winds 10 knots becoming variable less than 10 knots. Wind waves 3 to 4 feet. North swell 4 to 6 feet. Scattered showers.
PHZ100 956 Am 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 east winds today. Winds will veer out of the southeast starting tomorrow as a front approaches from the northwest.


7 Day Forecast for Marine Location Near Heeia, HI
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location: 21.44, -157.81     debug


Area Discussion for -
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FXHW60 PHFO 011949 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 949 AM HST Wed Apr 1 2020

SYNOPSIS. Sea breezes will overpower the weak trade wind flow this afternoon, leading to spotty heavy showers and a few thunderstorms over the islands. Deep low pressure developing far northwest of the state on Thursday will cause winds to veer out of the southeast, leading to a somewhat unstable land and sea breeze regime that will produce spotty showers, some heavy, over the islands mainly during the afternoon 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 front associated with the low is expected to bring greater moisture and instability over the state on Monday and Tuesday.

DISCUSSION. Spotty heavy showers and thunderstorms are expected this afternoon as weak trade winds are overpowered by sea breezes. Deep troughing at the surface and aloft dominates across the Pacific north of the state, splitting a pair of strong surface highs. As a result, local trades are suppressed, and a weak trough passing just north of Oahu is causing winds to be northeasterly on Kauai and Oahu this morning. A shortwave aloft is clearing the islands to the east this morning, leaving a few lingering heavy showers around the Big Island. Even as this feature moves away, a stubborn upper level trough will remain overhead and will maintain unstable conditions. As sea breezes develop this afternoon, expect spotty showers, some heavy, and a few thunderstorms to flare over interior portions of all islands, with the greater coverage due on the Big Island.

Trade winds will gradually shift out of the southeast tonight and Thursday as an area of deep low pressure develops in the trough far northwest of the state. While showers will favor east and southeast slopes, a land and sea breeze regime will dominate over leeward areas, leading to clouds and spotty afternoon showers, some briefly heavy. Aside from the interior slopes of the Big Island, thunderstorms are unlikely.

As the deep low settles about 850 miles northwest of the state on Friday, shower chances will increase, as winds shift more southerly and draw deeper moisture over the islands. The state will be under the outer portion of the upper level trough associated with the low, likely leading to enough instability to trigger isolated heavy showers, but thunderstorms are not expected at this time. As a front associated with the low edges closer to the state on Sunday, shower chances should increase, especially across the western end of the state. In addition, the southerly flow will push dew points up to around 70, bringing an increase humidity that we have not experienced for a while.

On Monday and Tuesday, the front, or what is left of it, is expected to push across the portions of the island chain. The GFS and ECMWF have yet to settle on a consistent solution, but expect higher potential for heavy showers as a shortwave aloft enhances moisture along the front.

AVIATION. Weak flow will continue today as a trough remains near the islands. With this pattern in place, expect sea breeze development this afternoon, poised to affect coastal locations. Sufficient moisture and instability aloft associated with the aforementioned feature will lead to showers and even the chance of a thunderstorm or two over mainly interior locations over the next several hours. Isolated MVFR conditions may occur where the heavier shower or thunderstorms develop.

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 eastern offshore waters 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 beginning Thursday. 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. A convergence band associated with the low will likely move over the northwest offshore waters Saturday, strengthening south winds over the western waters and bringing another chance of thunderstorms.

The current small northwest swell will slowly subside through Friday night. A new swell building Saturday will produce moderate surf along north and west facing shores over the weekend, but is expected to remain well below the advisory threshold. Swells from the southern hemisphere will maintain elevated surf along south facing shores through tomorrow, but should remain just below advisory levels. Swells from the distant southeast Pacific will be partly blocked by the islands of French Polynesia but should be enough to produce small surf through the rest of the week. Surf along east facing 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 . Wroe AVIATION . Thomas MARINE . TS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi40 min NNW 6 G 7 74°F 75°F1015.8 hPa
51207 4 mi46 min 75°F5 ft
51210 4 mi46 min 75°F5 ft
OOUH1 - 1612340 - Honolulu, HI 10 mi52 min WSW 2.9 G 2.9 75°F 76°F1015.8 hPa
51211 13 mi46 min 76°F2 ft
51212 20 mi46 min 76°F3 ft
51201 - Waimea Bay, HI (106) 23 mi46 min 76°F4 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi79 minN 710.00 miA Few Clouds80°F66°F64%1014.8 hPa
Daniel K Inouye International Airport, HI9 mi23 minVar 310.00 miA Few Clouds79°F63°F58%1015.6 hPa
Wheeler Air Force Base / Oahu, HI12 mi23 minNNW 810.00 miPartly Cloudy74°F67°F80%1015.1 hPa
Oahu, Kalaeloa Airport, HI16 mi83 minVar 410.00 miFair79°F64°F62%1017 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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Last 24hrNE8NE9E9--E8E6E4E6NE5E4NE3NE9E9NE9NE8N9N8NE10N9N8N6N5N7N7
1 day agoE9E11E12E10NE11E11E9E7E9E7E9E9E8E7NE6CalmE7E5E6E8E7E6E7E9
2 days agoE7E8E10NE12NE11NE10E9E9E9E10E10E7
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Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu 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 Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Wed -- 12:21 AM HST     First Quarter
Wed -- 01:24 AM HST     Moonset
Wed -- 06:01 AM HST     0.23 feet Low Tide
Wed -- 06:23 AM HST     Sunrise
Wed -- 10:12 AM HST     0.44 feet High Tide
Wed -- 12:31 PM HST     Moonrise
Wed -- 02:57 PM HST     0.20 feet Low Tide
Wed -- 06:45 PM HST     Sunset
Wed -- 10:41 PM HST     1.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.10.80.60.40.30.20.30.30.40.40.40.40.30.20.20.30.40.611.31.51.71.7

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 (16,3,4,5)
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Ground Weather Radar Station Molokai, 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.