Friday, September20, 2019 L-36.com


Marine Weather and Tides
Haena, 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 6:31PM Friday September 20, 2019 6:22 AM HST (16:22 UTC) Moonrise 11:18PMMoonset 12:02PM Illumination 60% 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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PHZ110 Kauai Northwest Waters- 323 Am Hst Fri Sep 20 2019
Today..East winds 20 knots. Wind waves 4 feet. Scattered showers.
Tonight..East winds 20 knots. Wind waves 4 feet. Scattered showers.
Saturday..East winds 20 knots. Wind waves 4 feet. Scattered showers.
Saturday night..East winds 15 knots. Wind waves 4 feet. Scattered showers.
Sunday..East winds 10 knots. Wind waves 4 feet. Scattered heavy showers.
Sunday night..East winds 10 knots. Wind waves 4 feet. Scattered heavy showers.
Monday..East winds 15 knots. Wind waves 5 to 6 feet. Isolated showers.
Tuesday..Southeast winds 15 knots. Wind waves 5 to 6 feet. Scattered showers.
PHZ100 323 Am Hst Fri Sep 20 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.


7 Day Forecast for Marine Location Near Haena, HI
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location: 22.2, -159.68     debug


Area Discussion for -
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Fxhw60 phfo 201354
afdhfo
area forecast discussion
national weather service honolulu hi
353 am hst Fri sep 20 2019

Synopsis
Island weather will trend wetter through the weekend, with
diminishing trade winds and increased moisture also making it feel
quite muggy by Sunday. The chances for a few locally heavy showers
will increase as well, as a low pressure system in the upper
atmosphere passes near the islands. Light winds may continue for
most of next week.

Discussion
A sharp trough in the mid- to upper-atmosphere is digging toward the
islands from the north, bringing with it broken to overcast layered
high clouds that are currently blanketing skies over all islands.

The high clouds are efficiently obscuring a satellite view of the
incoming low cloud field, while radar shows a few showers moving
quickly westward within a moderate to breezy trade wind flow. 12z
soundings show a capping subsidence inversion remains in place at
around 8000 feet, and shower coverage has remained limited
overnight.

As the trough continues to dig south today, it will push most of the
high clouds south of the smaller islands, while also helping to
carve out a cut-off closed low aloft tonight into Saturday. With
moderate to locally breezy trade winds in the low-levels supplied by
a surface high to the distant northeast, the most likely area for
showers will be windward areas through Saturday. While the trades
will also keep showers from sitting over any one area for too long,
they will also push a few sprinkles leeward on the smaller islands.

The low aloft is expected to develop just to the northeast of the
islands, bringing moderate instability as it drifts west and
northwest over the islands through Saturday. In response, 500 mb
temperatures are forecast to drop ~4 degrees c into Saturday,
bottoming out near -9c. As the low moves west of the islands Sunday
into early next week, instability will diminish somewhat as mid-
level temps warm, but moisture is expected to increase.

The low aloft is expected to induce the development of a low-level
trough over the area that will bring light east to southeast winds.

Layered high clouds south and east of the low's center will spread
from the big island to the other islands by Sunday and Monday, and
periods of considerable cloudiness are possible. However, the
greatest instability may not phase together with the deepest
moisture, thus reducing thunderstorm chances, except over leeward
big island, where daytime heating may spark an isolated thunderstorm
on Saturday. As the low moves west of the area, a plume of deep
moisture will be pulled northward over the islands, and this appears
to be conducive for the development of locally heavy showers, and
these have been added to the forecast for Sunday and Monday.

Difficult to pinpoint exactly where and when these would occur, but
the diminished winds may allow sea breezes to drive heavy shower
development over leeward and interior areas during the afternoons
and evenings, while the light east to southeast winds deliver
windward showers that would favor nights and mornings.

The low aloft will move west of the islands Tuesday and then get
drawn northward into the circulation of a new low aloft that is
forecast to approach from the distant northwest by the middle of
next week. This is forecast to allow a mid-level ridge to build over
the islands from the northeast, but latest GFS guidance indicates
that this new low may keep the surface trough from weakening or
leaving the area. Lingering low-level convergence could potentially
support continued shower development, and winds would remain on the
lighter side, if this were to verify. The forecast grids lean toward
a light to moderate trade wind weather regime from Wednesday onward,
supported by latest ECMWF guidance.

Aviation
Trade wind flow continues at the surface, but a swath of mid and
high clouds is moving from northwest to southeast across the island
chain. There are some trade wind showers moving across windward
areas that will bring brief periods of MVFR conditions, but overall,
vfr should prevail.

The potential for light icing exists, but does not seem widespread
enough to warrant issuance of airmet zulu at this time.

Marine
Fresh to locally strong, easterly trade winds will continue into the
weekend. The small craft advisory for most of the typical windy
areas around maui and the big island has been extended through
Saturday. Winds will gradually weaken through the weekend as a
surface trough approaches from the east. The trough will increase
showers starting Saturday, as well as shift winds out of the
southeast by Sunday, allowing sea and land breezes to develop over
leeward areas.

A series of small swells from the southwest and south are expected
through the rest of this week. A small northwest swell is possible
late in the weekend into early next week. A small east swell from
tropical cyclone kiko will persist into the weekend.

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

Discussion... Birchard
aviation... Dye
marine... Ts


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51208 8 mi52 min 5 ft
NWWH1 - 1611400 - Nawiliwili, HI 24 mi52 min NE 7 G 11 80°F 1013.8 hPa
51201 - Waimea Bay, HI (106) 91 mi40 min 79°F4 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kekaha, Pacific Missile Test Facility Barking Sands, HI10 mi26 minN 310.00 miFair79°F71°F77%1013.6 hPa
Lihue, Lihue Airport, HI23 mi29 minNE 1110.00 miLight Rain81°F73°F77%1013.9 hPa

Link to 5 minute data for PHBK

Wind History from HBK (wind in knots)
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Last 24hrE3S4SE9
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56N11NW8W7SE7S9NW6N8NE6N6NE3SE3E4CalmE4CalmCalmCalmCalmN3
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2 days agoNE3CalmSE63W3N5SE11
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S7N8N7CalmCalmSE33E6CalmSE3SE3E4E4E4Calm

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Fri -- 06:26 AM HST     Sunrise
Fri -- 07:20 AM HST     1.80 feet High Tide
Fri -- 12:02 PM HST     Moonset
Fri -- 02:35 PM HST     0.78 feet Low Tide
Fri -- 06:34 PM HST     0.90 feet High Tide
Fri -- 06:36 PM HST     Sunset
Fri -- 11:17 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.711.31.51.71.81.81.61.41.210.90.80.80.80.90.90.90.80.70.60.5

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Fri -- 12:44 AM HST     0.41 feet Low Tide
Fri -- 06:25 AM HST     Sunrise
Fri -- 08:31 AM HST     1.70 feet High Tide
Fri -- 12:00 PM HST     Moonset
Fri -- 04:01 PM HST     0.78 feet Low Tide
Fri -- 06:35 PM HST     Sunset
Fri -- 07:45 PM HST     0.80 feet High Tide
Fri -- 11:16 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.50.70.91.11.41.61.71.71.61.41.210.90.80.80.80.80.80.80.80.70.6

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 (12,3,4,5)
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Ground Weather Radar Station Kauai, 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.