Saturday, September21, 2019 L-36.com


Marine Weather and Tides
Haleiwa, HI

Version 3.4
NOTICE
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.
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 6:19AMSunset 6:30PM Saturday September 21, 2019 1:21 PM HST (23:21 UTC) Moonrise 12:00AMMoonset 12:52PM Illumination 46% Phase: Third Quarter Moon; Moon at 22 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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PHZ114 Oahu Windward Waters- 949 Am Hst Sat Sep 21 2019
Rest of today..East winds 20 knots. Wind waves 6 feet. Scattered showers and slight chance of Thunderstorms.
Tonight..East winds 20 knots. Wind waves 6 feet. Scattered showers and slight chance of Thunderstorms.
Sunday..East winds 15 knots. Wind waves 5 feet. Scattered showers and slight chance of Thunderstorms in the morning, then isolated heavy showers in the afternoon.
Sunday night..East winds 15 knots. Wind waves 6 feet. Heavy showers likely.
Monday..East winds 15 knots. Wind waves 6 feet. South swell 3 feet. Heavy showers likely.
Monday night..East winds 15 knots. Wind waves 6 feet. South swell 3 feet. Heavy showers likely.
Tuesday..East winds 15 knots. Wind waves 5 to 6 feet. Scattered showers.
Wednesday..East winds 10 knots. Wind waves 5 feet. Scattered showers.
PHZ100 949 Am Hst Sat Sep 21 2019
Synopsis for hawaiian coastal waters.. High pressure will remain far north-northeast of the islands into next week. A trough will approach the area from the east and bring unstable, wet conditions through this weekend and into early next week.


7 Day Forecast for Marine Location Near Haleiwa, HI
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location: 21.6, -158.12     debug


Area Discussion for -
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Fxhw60 phfo 211952
afdhfo
area forecast discussion
national weather service honolulu hi
952 am hst Sat sep 21 2019

Synopsis
Increasing moisture and instability will translate to a wet
pattern through the weekend. Shower coverage will continue to
focus over windward areas today, then become more widespread
Sunday through Monday as the trades diminish. Although some drier
air is expected to fill in over the big island and maui county by
Tuesday, the wet pattern is forecast to linger over kauai and oahu
through midweek.

Discussion
Currently at the surface, a trough of low pressure is located
around 250 miles east-southeast of the big island, while a 1026 mb
high is centered around 1250 miles north-northeast of honolulu.

The resulting gradient is producing moderate trade winds across
the island chain this morning. Meanwhile aloft, a closed low is
located over the oahu and maui county. Visible satellite imagery
shows partly to mostly cloudy skies across the state, with cloud
cover more prevalent over windward locales. Radar imagery shows
scattered to numerous showers moving into windward areas, with
quite a bit of leeward spillover. Main short term concerns over
the next few days revolve around the potential for heavy rainfall
and thunderstorms.

Today through Tuesday,
model solutions are in good agreement the next several days,
showing the upper level low retrograding westward, dragging a
trailing surface trough and plume of deep tropical moisture with
2.0 to 2.5 inch precipitable water values westward and through
the island chain. This is expected to result in an unsettled
period of weather across the state, with the potential for
producing locally heavy rainfall and thunderstorms at times.

Showers are expected to favor windward areas, although leeward
areas will see a fair amount of afternoon and early evening
shower activity due to the unstable airmass in place. The plume of
deep tropical moisture is expected to arrive over the eastern end
of the state tonight, then spread westward over maui county and
oahu on Sunday and into kauai Sunday night. Most of the state will
be in the soupy airmass on Monday, with some drier air beginning
to work in from the east, particularly across the big island an
maui county, Monday night and Tuesday. For now the most unstable
airmass associated with the upper low and deeper tropical moisture
associated with the trailing surface trough don't appear to align
in a manner consistent with a widespread flash flood threat. That
said, given the copious amount of deep tropical moisture moving
through, we will continue to monitor the potential for flash
flooding closely as the pattern evolves.

Tuesday night through Friday,
there are some conflicting signals in the guidance in the longer
range periods, with the ECMWF suggesting the surface trough and
trailing plume of deep tropical moisture will shift just west of
the state Tuesday night, although it will remain in close
proximity to kauai. The GFS on the otherhand, lingers the surface
trough and deep tropical moisture over kauai through Thursday,
before bringing in a drier trade wind pattern for the end of the
work week. For now will keep the forecast more wet across the
western islands through Thursday until details become more clear.

Aviation
A moist and somewhat unstable trade wind flow will persist through
tonight. High pressure far northeast of the state will maintain
gusty trades while an upper level low centered over the central
islands drifts westward. The unstable trade wind flow is producing
a rather active shower pattern, leading to periods of MVFR
ceilings and visibility along windward slopes in passing moderate
to heavy showers. Airmet sierra is currently in effect for parts
of maui and the big island, but expect that airmet to be dropped
shortly. Clouds and spotty showers, and perhaps a thunderstorm
will develop over interior and leeward sections today, mainly on
the big island where localized MVFR conditions are possible. Over
other leeward areas, expect brief, though rather heavy, showers to
produce isolated MVFR conditions.

A band of layered middle and high clouds associated with the
upper low is expected to spread northwestward over the state late
tonight and Sunday. Airmet zulu for light icing will be taken
down shortly but should be needed again as the high clouds thicken
overhead.

Marine
High pressure far north-northeast of the state will maintain fresh
to locally strong northeast trades through today. A small craft
advisory (sca) remains in effect for the typical windy areas
around maui and the big island through this afternoon. Beginning
tonight, a trough passing just south of the state will bring
increasing showers and a decrease to light to moderate wind speeds
out of the east-southeast. Sea and land breezes are possible on
Sunday, especially along the leeward coasts. Models are currently
indicating fresh east to east-southeast winds returning on Monday
with winds increasing to borderline SCA levels near the windy
areas around maui county and the big island by Monday afternoon. A
front developing northwest of the state Monday into Tuesday,
should lead to light to moderate east-southeast winds by middle of
next week.

A series of small swells from the southwest, and south are
expected through this weekend and into early next week. A small
northwest swell is expected to fill in later tonight and peak
Sunday and lower through Monday. In the longer term, a prolonged
south swell from a storm south of new zealand could arrive around
the middle of next week and potentially bring advisory level surf
by the end of next week. Additionally, a few small northwest
swells will be possible during the second half of the week.

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

Discussion... Jelsema
aviation... Wroe
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51201 - Waimea Bay, HI (106) 5 mi39 min 79°F5 ft
51212 19 mi51 min 83°F3 ft
51207 21 mi51 min 81°F6 ft
51210 21 mi51 min 81°F6 ft
MOKH1 - 1612480 - Mokuoloe, HI 21 mi45 min ENE 12 G 14 81°F 83°F1014.6 hPa
51211 23 mi51 min 83°F3 ft
OOUH1 - 1612340 - Honolulu, HI 25 mi51 min E 5.1 G 8 85°F 83°F1014 hPa
51202 - Mokapu Point, HI (098) 27 mi51 min 82°F6 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wheeler Air Force Base / Oahu, HI10 mi25 minE 9 G 1510.00 miMostly Cloudy83°F68°F63%1013.3 hPa
Oahu, Kalaeloa Airport, HI20 mi2.5 hrsENE 11 G 1810.00 miPartly Cloudy88°F69°F54%1015.6 hPa
Daniel K Inouye International Airport, HI20 mi28 minNNE 13 G 2010.00 miPartly Cloudy78°F66°F69%1013.5 hPa

Link to 5 minute data for PHHI

Wind History from HHI (wind in knots)
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Last 24hrE5--NE5E9E7NE5CalmCalmN3N4N4NE6NE6NE5N3W3CalmNE3NE7CalmE10NE15E10
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E9
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1 day agoNE12E9E15NE10NE6SE3E3CalmE6CalmE6E5CalmN3N4E3CalmCalmNW4N3E8E6NE9E10
2 days agoE11
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E13E14E13E5CalmE3E4E5CalmCalmSW3CalmNW3CalmE5CalmCalmNW3E5E6E8
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Tide / Current Tables for Haleiwa, Waialua Bay, Oahu Island, Hawaii
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Haleiwa
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Sat -- 06:20 AM HST     Sunrise
Sat -- 09:00 AM HST     1.51 feet High Tide
Sat -- 12:52 PM HST     Moonset
Sat -- 03:56 PM HST     0.53 feet Low Tide
Sat -- 04:43 PM HST     Last Quarter
Sat -- 06:29 PM HST     Sunset
Sat -- 08:52 PM HST     0.64 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.50.60.811.21.41.51.51.51.31.10.90.70.60.50.50.60.60.60.60.60.5

Tide / Current Tables for Laie Bay, Oahu Island, Hawaii
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Laie Bay
Click for Map
Sat -- 12:11 AM HST     0.55 feet Low Tide
Sat -- 06:20 AM HST     Sunrise
Sat -- 08:17 AM HST     1.99 feet High Tide
Sat -- 12:51 PM HST     Moonset
Sat -- 04:15 PM HST     0.76 feet Low Tide
Sat -- 04:43 PM HST     Last Quarter
Sat -- 06:28 PM HST     Sunset
Sat -- 08:09 PM HST     0.91 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.60.70.91.21.41.71.9221.81.61.41.10.90.80.80.80.80.90.90.90.80.7

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.
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Wind Forecast for (19,4,5,8)
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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.