Saturday, March25, 2017 L-36.com


Marine Weather and Tides
Urban Honolulu, HI

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:28AMSunset 6:45PM Saturday March 25, 2017 5:41 AM HST (15:41 UTC) Moonrise 4:54AMMoonset 4:47PM Illumination 4% Phase: Waning Crescent; Moon at 28 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- 319 Am Hst Sat Mar 25 2017
.small craft advisory in effect from late this morning through early Monday morning...
Today..East winds 20 kt. Wind waves 6 ft. Northwest swell 5 ft increasing to 7 ft in the afternoon. Isolated showers in the morning.
Tonight..East winds to 25 kt. Wind waves 8 ft. Northwest swell 9 ft. Isolated showers in the evening. Scattered showers after midnight.
Sunday..East winds 20 kt. Wind waves 8 ft. Northwest swell 11 ft. Scattered showers in the morning...then isolated showers in the afternoon.
Sunday night..East winds 20 kt. Wind waves 7 ft. Northwest swell 10 ft. Isolated showers in the evening...then scattered showers after midnight.
Monday..East winds 15 kt. Wind waves 7 ft. Northwest swell 8 ft. Scattered showers in the morning. Isolated showers in the afternoon.
Monday night..East winds 20 kt. Wind waves 6 ft. Northwest swell 7 ft. Isolated showers in the evening. Scattered showers after midnight.
Tuesday..East winds 20 kt. Wind waves 6 ft. Northwest swell 7 ft. Isolated showers.
Wednesday..East winds 20 kt. Wind waves 6 ft. Northwest swell 6 to 7 ft. Isolated showers.
PHZ100 319 Am Hst Sat Mar 25 2017
Synopsis for hawaiian coastal waters.. High pressure northeast of the state will strengthen over the next few days...providing locally breezy trade winds through the weekend. Winds will ease slightly early next week as the high moves further from the state. A large west-northwest swell is expected to spread across the waters today...then peak tonight into Sunday.

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 251320
afdhfo
area forecast discussion
national weather service honolulu hi
320 am hst Sat mar 25 2017

Synopsis
A persistent ridge of high pressure north of the islands will keep
trade winds blowing across local waters through the week, with a
slight increase into the locally breezy range expected through
this weekend. Clouds and showers will favor windward slopes,
especially at night and in the mornings. Slightly weaker trade
winds are expected by midweek as upper troughing develops across
the area.

Discussion
A surface ridge extending east to west along 27n, to the north of
the main hawaiian islands, keeps moderate to locally strong
easterly trade winds blowing across local waters this morning.

Remnant moisture from an old frontal boundary passed west of the
islands overnight, leaving a typical trade wind weather pattern
of clouds and showers locally.

Satellite loop shows scant low cloud cover statewide, with
scattered clouds lingering mainly across windward shores and
slopes of the smaller islands. Earlier cloud cover across the big
island has decreased dramatically, leaving mostly clear skies
everywhere except for along windward shores and slopes, where
scattered low clouds persist. Radar shows very little shower
activity, mainly as isolated light showers embedded within trade
flow upwind from oahu and the big island. A single notable shower
has formed over land near kailua-kona on the big island.

Models show the ridge will remain north of the islands through the
forecast period, with no areas of enhanced moisture or disturbed
weather expected through the weekend and into early next week.

High pressure along the ridge will consolidate north and
northwest of the islands, tightening the local pressure gradient
and causing trades to increase today across the eastern half of
the main island chain. Clouds and showers will favor windward and
mauka areas, with leeward areas of the big island expected to
cloud up each afternoon and evening, then clear out each night.

Deep troughing forecast during the middle of next week west of
170w will weaken the pressure gradient across the islands, causing
trade winds to decrease slightly from Tuesday onwards. An uptick
in windward rainfall may occur Tuesday or Wednesday as ridging
aloft is eroded by a trough skirting by to the north.

Aviation
Some clouds and showers are lingering over the windward side of
kauai early this morning but are expected to thin as the day wears
on.VFR conditions are expected to prevail. Trade winds will
increase today, which may require airmet tango for moderate
turbulence to the lee of the mountains. No airmets are in effect
at this time.

Marine
Forerunners of the large incoming west-northwest swell have
been arriving on schedule at buoy 51101 to the northwest of kauai
during the last few hours. A Friday evening satellite altimetry
pass showed that this swell appears to be running close to the
wavewatch guidance levels, and the latest ECMWF wave model has
also come into much better agreement with the wavewatch on the
timing of this swell. Surf on kauai is expected to build to
warning levels (25 ft north/20 ft west) during the day, then peak
tonight into Sunday morning. Warning level surf should continue
through the day Sunday, before gradually subsiding early next
week. The more westerly direction of the swell will likely cause
kauai to shadow the other smaller islands. The current forecast
continues to hold surf for exposed north and west facing shores of
oahu and maui county just under warning levels. This will be
monitored as more observations come in from the northwest buoys,
and a slightly larger or more northwest swell could bring warning
level surf to oahu/maui county as well. Surf along west facing
shores of the big island is also forecast to reach low-end warning
level (12 ft) tonight through Sunday night. A high surf warning
has been posted for north/west facing shores of niihau and kauai,
and for the west facing shores of the big island. A high surf
advisory has been posted for north/west facing shores of oahu and
molokai, and for north facing shores of maui.

Otherwise, small long period south swells will continue through
this weekend and into next week, with a slightly larger long
period south swell forecast for Wednesday night through Friday.

Another large west-northwest swell will be possible from next
Friday into the following weekend.

The small craft advisory (sca) remains posted for the typically
windier waters around the big island and maui county through
Sunday night. High pressure strengthening northeast of the state
will provide locally breezy conditions through the weekend. The
sca has been expanded to cover the most of the other coastal
waters late this morning, and the remaining waters early this
evening, as seas build above 10 ft due to the large incoming
west-northwest swell.

Hfo watches/warnings/advisories
High surf advisory from noon today to 6 am hst Monday for
waianae coast-oahu north shore-oahu koolau-molokai-maui windward
west-maui central valley-windward haleakala.

High surf warning from 6 am this morning to 6 am hst Monday for
niihau-kauai windward-kauai leeward.

High surf warning from 6 pm this evening to 6 am hst Monday for
kona-south big island-kohala.

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

Small craft advisory from 6 pm this evening to 6 am hst Monday
for oahu leeward waters-maui county leeward waters-big island
windward waters.

Small craft advisory from 10 am this morning to 6 am hst Monday
for kauai northwest waters-kauai windward waters-kauai leeward
waters-kauai channel-oahu windward waters-kaiwi channel-maui
county windward waters.

Discussion... Powell
aviation... M ballard
marine... Jacobson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi41 min S 1 G 1.9 74°F 78°F1022 hPa (-1.0)
MOKH1 - 1612480 - Mokuoloe, HI 11 mi65 min E 2.9 G 5.1 75°F 79°F1021.9 hPa
51210 14 mi41 min 75°F4 ft
51202 - Mokapu Point, HI (098) 14 mi37 min 76°F5 ft
51207 15 mi46 min 75°F4 ft
51201 - Waimea Bay, HI (106) 29 mi39 min 75°F4 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Honolulu, Honolulu International Airport, HI5 mi48 minN 310.00 miA Few Clouds71°F66°F84%1021.2 hPa
Oahu, Kalaeloa Airport, HI10 mi48 minNE 410.00 miFair68°F63°F84%1022.3 hPa
Wheeler Air Force Base / Oahu, HI15 mi1.7 hrsWNW 410.00 miFair63°F63°F99%1020.8 hPa

Wind History from HNL (wind in knots)
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Last 24hrN5N5N4E3NE8E11NE6SE13SE13SE11SE10NE11NE10NE10E9N4E9NE4N3NE7CalmNE5N3N3
1 day agoNW54CalmCalm3NE7NE12NE7SE11
G19
NE12NE10E11E8E9NE11E7NE8NE5N4NW4N7N4W5NW4
2 days agoNE7NE9NE7NE7E10E7NE83E7SE14SE13
G17
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G16
NE9NE10NE7NE7NE5N4CalmCalmN4NW3N4Calm

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Sat -- 02:24 AM HST     1.80 feet High Tide
Sat -- 04:54 AM HST     Moonrise
Sat -- 06:30 AM HST     Sunrise
Sat -- 09:01 AM HST     -0.11 feet Low Tide
Sat -- 02:47 PM HST     1.16 feet High Tide
Sat -- 04:47 PM HST     Moonset
Sat -- 06:44 PM HST     Sunset
Sat -- 08:31 PM HST     -0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.21.61.81.81.51.20.70.3-0-0.1-00.20.60.91.11.210.80.40.1-0.1-0.10.10.5

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Sat -- 01:25 AM HST     1.77 feet High Tide
Sat -- 04:53 AM HST     Moonrise
Sat -- 06:29 AM HST     Sunrise
Sat -- 08:15 AM HST     -0.04 feet Low Tide
Sat -- 01:48 PM HST     1.18 feet High Tide
Sat -- 04:46 PM HST     Moonset
Sat -- 06:43 PM HST     Sunset
Sat -- 07:48 PM HST     -0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.61.81.71.51.20.80.40.1-000.20.60.91.11.21.10.80.50.20-00.10.40.9

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
cpac_satellite

GOES Local Image of Hawaii    EDIT
Geos

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.