Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Urban Honolulu, HI

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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 6:10AMSunset 6:58PM Wednesday August 21, 2019 5:28 AM HST (15:28 UTC) Moonrise 11:06PMMoonset 11:18AM Illumination 65% Phase: Waning Gibbous; Moon at 21 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- 331 Am Hst Wed Aug 21 2019
Today..Northeast winds 20 knots. Wind waves 5 feet. South swell 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tonight..Northeast winds 20 knots. Wind waves 5 feet. South swell 4 feet. Scattered showers.
Thursday..Northeast winds 15 knots. Wind waves 4 feet. Mixed swell south 3 feet and northwest 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Thursday night..Northeast winds 15 knots. Wind waves 4 feet. SWell northwest 3 feet. Scattered showers in the evening, then isolated showers after midnight.
Friday..East winds 15 knots. Wind waves 4 feet. SWell northwest 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Friday night..East winds 15 knots. Wind waves 5 feet. SWell northwest 3 feet. Scattered showers in the evening, then isolated showers after midnight.
Saturday..East winds 15 knots. Wind waves 5 to 7 feet. Scattered showers.
Sunday..East winds 20 knots. Wind waves 7 feet. Isolated showers.
PHZ100 331 Am Hst Wed Aug 21 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep moderate to locally strong trade winds in place through the weekend.


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 211338
afdhfo
area forecast discussion
national weather service honolulu hi
338 am hst Wed aug 21 2019

Synopsis
A surface ridge north of the area will maintain locally breezy
trade winds over the islands. Expect showers to remain focused
over windward and mountain areas in the trade wind flow.

Discussion
No significant changes to the forecast with the morning package.

Some minor tweaks to the winds in the first 24 hours primarily to
nudge a few areas towards higher wind speeds as suggested by some
of the high resolution models.

A 1021 mb high was analyzed about 700 miles north-northwest of the
islands overnight. The high and its associated ridge will maintain
a trade wind pattern into the weekend. A weakening trough south of
the islands brought some additional showers to the islands
yesterday and overnight, but its effects will continue to decrease
today. Meanwhile, a front more than 770 miles north- northeast of
the islands will bring an increase in shower activity to the area
near and north of kauai Friday night.

As the high builds north of the islands today, we can expect to
see an uptick in the trade winds. The latest satellite derived
precipitable water (pw) shows the bulk of the moisture that was
carried into the islands with the above mentioned trough has moved
west of the islands. Satellite shows more typical trade wind clouds
and showers being carried in the trade wind flow to the windward
sides of the islands, as we would expect with pw values around 1.5
inches.

The front to the north-northwest will sink southward and help to
weaken the trade winds Thursday and Friday. Heading into the
weekend, the weakening front moves to the west and a ridge north
of the islands will become more established, allowing trade winds
to rebound.

Aviation
A moderate to locally strong trade wind regime will continue
beyond 04z as a ridge of high pressure remains north of the
islands. Satellite imagery shows a broken field of low clouds
working across windward big island and maui, towards oahu and
kauai. The showers have brought brief MVFR conditions to especially
hilo airport, with ceilings at 14 hundred feet and 1 and three
quarter mile vis. Conditions appear to be improving there as the
field is gradually dispersing. Oahu has seen an increase in trade
showers in the past hour, and kauai will follow suite in the next
hour or two. But as the morning progresses, after sunrise, these
clouds and showers will dissipating, giving way a nice afternoon.

The lee side of the big island will go through its norm phase of
morning sun, then afternoon clouds with a few showers. Airmet
tango is likely below 6k feet as the trade winds have become
stiffer and stronger as per radar and lihue sounding.

Marine
High pressure building northwest of the state will keep a moderate
to locally strong trade wind flow in place over the next couple
days. As a result, a small craft advisory (sca) remains in effect
for the typically windy waters around maui and the big island
through Thursday. A front dropping southward and closer to the
island chain late in the week, will ease the trade winds slightly
Thursday night through Friday night. A new high building northeast
of the islands will then strengthen the trades back to moderate
and locally strong levels over the weekend, with scas likely
being required once again for the windier marine zones.

The current long-period south swell will hold steady today, then
gradually lower tonight into the weekend. A high surf advisory
remains in effect for south facing shores of all islands through 6
am Thursday. A series of small long-period south and southwest
swells will move through Sunday through early next week. A larger
southwest swell is possible Tuesday through the middle of next
week.

Small northwest swells will linger over the next few days
providing some out of season surf along north facing shores.

Strengthening trade winds will give a boost in short period choppy
surf along east facing shores through tonight and again over the
weekend.

Hfo watches warnings advisories
High surf advisory until 6 am hst Thursday for niihau-kauai
windward-kauai leeward-oahu south shore-waianae coast-molokai
leeward-lanai makai-kahoolawe-maui leeward west-maui central
valley-leeward haleakala-kona-south big island-big island north
and east.

Small craft advisory until 6 pm hst Thursday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... M ballard
aviation... H lau
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi65 min NE 1 G 4.1 80°F 82°F1016.1 hPa
51211 4 mi59 min 82°F3 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi53 min E 6 G 15 78°F 84°F1016.7 hPa
51202 - Mokapu Point, HI (098) 14 mi59 min 82°F5 ft
51210 14 mi59 min 82°F5 ft
51212 14 mi59 min 83°F3 ft
51207 15 mi35 min 82°F5 ft
51201 - Waimea Bay, HI (106) 29 mi47 min 78°F4 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 mi36 minENE 1310.00 miPartly Cloudy81°F70°F69%1016.1 hPa
Oahu, Kalaeloa Airport, HI10 mi36 minNE 410.00 miFair78°F71°F79%1017.1 hPa
Kaneohe, Marine Corps Air Station, HI12 mi50 minE 5 G 166.00 miOvercast with Haze79°F71°F77%1015.6 hPa
Wheeler Air Force Base / Oahu, HI15 mi33 minN 410.00 miMostly Cloudy75°F69°F83%1015.7 hPa

Link to 5 minute data for PHNL

Wind History from HNL (wind in knots)
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Last 24hrN43N5E14
G18
NE15--NE11NE13
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E10NE15NE13--NE14----E9----NE7E15NE9--E9NE13
1 day agoCalmCalmCalmNE7--NE8
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------------E6N4E8NE5NE7E10NE8
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NE14E15NE10NE9--NE4----CalmNE8NE5CalmN3--

Tide / Current Tables for Honolulu, Oahu (Hawaii)
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Honolulu
Click for Map
Wed -- 01:39 AM HST     0.36 feet Low Tide
Wed -- 06:11 AM HST     Sunrise
Wed -- 08:29 AM HST     1.43 feet High Tide
Wed -- 11:17 AM HST     Moonset
Wed -- 02:18 PM HST     0.85 feet Low Tide
Wed -- 06:57 PM HST     Sunset
Wed -- 07:32 PM HST     1.27 feet High Tide
Wed -- 11:05 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.40.50.70.91.11.31.41.41.31.210.90.90.90.91.11.21.31.31.210.8

Tide / Current Tables for Waimanalo, Oahu Island, Hawaii
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Waimanalo
Click for Map
Wed -- 12:30 AM HST     0.31 feet Low Tide
Wed -- 06:11 AM HST     Sunrise
Wed -- 07:14 AM HST     1.22 feet High Tide
Wed -- 11:16 AM HST     Moonset
Wed -- 01:09 PM HST     0.72 feet Low Tide
Wed -- 06:17 PM HST     1.08 feet High Tide
Wed -- 06:56 PM HST     Sunset
Wed -- 11:04 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.30.40.60.811.21.21.21.110.90.80.70.70.80.911.11.110.80.70.5

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (11,2,3,4)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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.