Wednesday, July17, 2019 L-36.com


Marine Weather and Tides
Urban Honolulu, HI

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6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 5:57AMSunset 7:17PM Wednesday July 17, 2019 12:27 AM HST (10:27 UTC) Moonrise 8:15PMMoonset 6:41AM 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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PHZ116 Kaiwi Channel- 834 Pm Hst Tue Jul 16 2019
.small craft advisory in effect through Friday afternoon...
Rest of tonight..East winds to 25 knots. Wind waves 8 feet. South swell 3 feet. Scattered showers early in the evening. Isolated showers after midnight.
Wednesday..East winds to 25 knots. Wind waves 8 feet. Isolated showers through the day.
Wednesday night..East winds to 25 knots. Wind waves 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Thursday..East winds to 25 knots. Wind waves 7 feet. Isolated showers.
Thursday night..East winds to 25 knots. Wind waves 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds to 25 knots. Wind waves 7 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 20 knots. Wind waves 7 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 6 feet. Scattered showers.
Sunday..Northeast winds 15 knots. Wind waves 5 feet. Scattered showers.
PHZ100 834 Pm Hst Tue Jul 16 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep fresh to strong trades in place through Friday. The trades will then ease over the weekend as the high pressure to the north weakens.


7 Day Forecast for Marine Location Near Urban Honolulu, HI
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location: 21.29, -157.88     debug


Area Discussion for -
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Fxhw60 phfo 170643
afdhfo
area forecast discussion
national weather service honolulu hi
830 pm hst Tue jul 16 2019

Synopsis
Trade wind weather will continue through the remainder of the week
into early next week, thanks to high pressure far north of the
area. Clouds and passing showers will favor windward and mauka
areas. Leeward sections of the big island will see clouds and
showers mainly during the afternoon and evening hours.

Discussion
Locally breezy trade winds prevail across the islands this evening,
as a surface high persists far north of the state. An upper level
trough in the island vicinity has led to passing showers being
enhanced. Bulk of the clouds and showers are affecting windward and
mountain areas, though winds are strong enough to carry some of the
clouds and showers to the lee areas of the smaller islands. Evening
convection is affecting lee areas of the big island at this time,
though these will slowly dissipate as the night progresses. Latest
satellite imagery revealed a little more low clouds over the
windward coastal waters at this time, with a slight break in the
cloud coverage then an extended line of low clouds further east.

In all, expect trade wind weather to continue through rest of the
evening into early Wednesday morning.

The upper level trough in the island vicinity will slowly move
northwest through Wednesday. As such, airmass in the island vicinity
will become more stable. Latest forecast solutions hinted a slight
decrease in moisture across the area Wednesday. Meanwhile, the
aforementioned high will persist far north through the rest of the
week, and in fact will strengthen slightly in the next couple of
days. The airmass may still be unstable enough for a slight chance
of an upslope thunderstorm to develop over the big island late
Wednesday afternoon. Shall take a closer look at this before
updating the forecast on this matter. Forecast models then hinted
an increase in moisture for the islands Thursday. Therefore, breezy
trade wind weather will prevail for the next few days, with possible
slightly less clouds and showers on Wednesday.

The high to our north is expected to slowly weaken by the weekend
into early next week. This points a slight downward trend in trade
wind speeds for the period. Furthermore, the aforementioned upper
level trough may sag back southward, closer to the state. This may
lead to a slight uptick in shower activity, mainly for windward and
mauka areas. Daytime heating will continue to allow for clouds and
showers to form over the leeward big island slopes each afternoon
and evening.

Aviation
A 1032 mb high north of the hawaiian islands will generate breezy to
occasionally windy easterly trades for the next 24-hours. Expect
scattered showers to affect mainly the windward and mauka areas with
isolated showers passing over onto the leeward side. Periods of MVFR
conditions may develop along the slopes tonight due to low clouds
and shra creating mountain obscuration.

Airmet tango remain in effect below 7000 ft for areas south thru
west of mountain ranges due to tempo moderate turbulence.

Marine
High pressure north of the state will keep fresh to strong trades in
place through Friday. The trades are expected to ease slightly over
the weekend, as high pressure to the north weakens. A small craft
advisory (sca) remains in effect for most waters between oahu and
the big island. Fresh trades are expected for the remaining waters
not in the sca, with winds likely flirting with SCA levels at times.

We will continue to monitor observational and model trends over the
next few days, and expand the SCA to additional marine zones if
needed.

The current south swell will continue to slowly subside through
tonight and Wednesday, with only small background south and
southwest swells expected Thursday through the weekend. A bit of a
boost in south shore surf is possible early next week, as a pair of
overlapping southwest swells move through. Locally strong trade
winds will produce choppy waves along east facing shores, but the
fetch will be short through Wednesday, so wave heights will remain
small. East shore surf will get a boost Thursday and Friday as the
upstream fetch of trade winds increases. Surf is expected to stay
just below advisory levels along east facing shores Thursday and
Friday and slowly ease over the weekend as trades ease.

Hfo watches warnings advisories
Small craft advisory until 6 am hst Saturday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Small craft advisory until 6 pm hst Friday for oahu leeward
waters-kaiwi channel-maui county windward waters-maui county
leeward waters.

Discussion... Hui
aviation... Thomas
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi63 min E 4.1 G 11 81°F 82°F1016.1 hPa
51211 4 mi57 min 82°F3 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi51 min E 6 G 13 80°F 84°F1016.6 hPa
51202 - Mokapu Point, HI (098) 14 mi57 min 82°F7 ft
51210 14 mi57 min 81°F6 ft
51212 14 mi57 min 82°F3 ft
51207 15 mi63 min 81°F7 ft
51201 - Waimea Bay, HI (106) 29 mi45 min 78°F5 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI5 mi34 minE 1010.00 miMostly Cloudy81°F71°F72%1015.9 hPa
Kaneohe, Marine Corps Air Station, HI12 mi90 minE 10 G 1610.00 miOvercast75°F73°F94%1015.1 hPa
Wheeler Air Force Base / Oahu, HI15 mi91 minN 010.00 miMostly Cloudy76°F71°F87%1015.3 hPa

Wind History from HNL (wind in knots)
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Last 24hrNE9NE8E7E8NE6NE6E10NE11NE9NE11
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1 day agoNE8NE13NE5E5NE3N4NE9NE5E12NE10
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2 days agoNE10E10E10E8NE11NE6NE10E11
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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 -- 03:14 AM HST     0.71 feet High Tide
Wed -- 05:58 AM HST     Sunrise
Wed -- 06:41 AM HST     Moonset
Wed -- 08:43 AM HST     0.01 feet Low Tide
Wed -- 03:57 PM HST     2.25 feet High Tide
Wed -- 07:15 PM HST     Sunset
Wed -- 08:14 PM HST     Moonrise
Wed -- 11:28 PM HST     0.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.60.70.70.60.40.2000.20.50.91.41.82.22.32.11.91.51.10.70.40.3

Weather Map and Satellite Images
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wmap_P
GOES 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (6,6,7,8)
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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 numerious 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.