Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Kahului, HI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:51AMSunset 6:27PM Wednesday February 20, 2019 12:30 PM HST (22:30 UTC) Moonrise 8:02PMMoonset 7:57AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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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PHZ119 Maalaea Bay- 1007 Am Hst Wed Feb 20 2019
Rest of today..Winds variable less than 10 knots. Wind waves 2 feet or less. Slight chance of showers in the afternoon.
Tonight..Northeast winds 10 knots. Wind waves 2 feet or less.
Thursday..Winds variable less than 10 knots becoming north 10 knots in the afternoon. Wind waves 2 feet or less. Chance of showers through the day.
Thursday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Friday..Winds variable less than 10 knots. Wind waves 2 feet or less. Scattered showers through the day.
Friday night..Winds variable less than 10 knots. Wind waves 2 feet or less.
Saturday..Winds variable less than 10 knots becoming northeast 10 knots. Wind waves 2 feet or less. Isolated showers.
Sunday..Northeast winds 10 knots in the morning becoming variable less than 10 knots, then becoming northeast 10 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less.
PHZ100 1007 Am Hst Wed Feb 20 2019
Synopsis for hawaiian coastal waters.. A surface trough will linger just east of the marine area into tonight then slowly drift westward and remain stationary over the eastern coastal waters through Saturday. Light and variable winds are expected in most areas today, with light to locally moderate northeasterly winds developing tonight and holding through the weekend.


7 Day Forecast for Marine Location Near Kahului, HI
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location: 20.9, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 202002
afdhfo
area forecast discussion
national weather service honolulu hi
1002 am hst Wed feb 20 2019

Synopsis
Light winds and mostly dry conditions will prevail over most of the
state the next couple of days. However, a trough just to the east of
the big island will drift west on Thursday, bringing an increase in
showers that will primarily affect windward areas of the big island
into the weekend. The trough will finally move away from the big
island by Saturday, with a brief period of northeasterly trade winds
expected Sunday into Monday. The trade winds will deliver clouds and
showers to windward areas of all islands.

Discussion
The forecast anticipates a quiet and mostly dry weather pattern over
the smaller islands over the next couple of days, while the big
island (after a mostly dry day today) is expected to see periods of
clouds and showers from Thursday into Saturday.

The primary weather feature near the islands the next couple of days
will be a surface trough near and E of the big island, which will
act as a focus for cloud and shower development. Otherwise, a very
weak pressure gradient over the remainder of the state will support
light winds. With a relatively dry air mass in place, and little in
the way of low-level forcing aside from converging afternoon sea
breezes, rainfall chances will be low over most areas - with the
best chance over island interiors in the afternoons.

The aforementioned surface trough has drifted sufficiently E to
allow a mostly dry day on the big island today, but the trough is
expected to drift W back toward the big island on Thursday, with
clouds and showers primarily affecting windward areas. Upper-level
support will not be conducive for widespread heavy rainfall, but
showers could be briefly heavy at times due to pwat greater than 2"
near the trough axis. The trough may move sufficiently W to bring
clouds and showers to portions of maui on Friday, with a weak mid-
level short wave potentially briefly enhancing showers Friday night
and Saturday. Meanwhile, kauai and oahu look to remain mostly dry
even with the shortwave passage.

Another weak shortwave passing through on Sunday will usher in
cooler temperatures aloft and a weak remnant of a cold front through
Sunday night. This feature could potentially fuel a few windward
showers, mainly along windward slopes and coasts as weak high
pressure passing quickly N of the islands provides a brief period of
light to moderate NE trade winds. It is the passage of these two
short waves that finally pushes the persistent low-level trough away
from the big island. Another weak frontal passage is possible around
the middle of next week.

Aviation
Some lingering cloud coverage over southern portions of the big
island but those clouds should clear out during the morning hours.

Only scattered clouds remain over other portions of the state.

With light winds through the period expect a daytime sea breeze -
nighttime land breeze scenario so an increase in clouds can be
expected into the afternoon hours. Other than that, expect
predominantlyVFR conditions across hawaii.

No airmets are currently in effect and none are anticipated through
this period.

Marine
A surface trough just east of the coastal waters today will drift w
tomorrow, then remain nearly stationary into the weekend. Variable
winds will prevail over the majority of the marine area today, with
gentle to locally moderate northeasterly winds developing tonight
and holding through the weekend.

The lingering small northwest and north swells will slowly fade over
the next 24 hours, with only small surf expected along north, west
and south facing shores through the weekend. A short-period easterly
swell will build this morning, peak late this afternoon and tonight,
then gradually lower Thursday through the weekend. A high surf
advisory remains in effect for east facing shores of the big island,
maui, molokai, oahu, and kauai through 6 pm hst Thursday. A moderate
northwest swell is expected early next week followed by large
northwest swell near the middle of next week.

A small craft advisory (sca) remains in effect for all windward
waters and some adjacent waters through tonight due to elevated seas
at or above the 10 foot SCA threshold. Seas are expected to drop
below SCA levels Thursday, with winds and seas then holding below
advisory levels through the weekend.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Thursday for east facing shores of
kauai oahu molokai maui and the big island.

High wind warning until 6 pm hst this evening for big island
summits.

Small craft advisory until 6 am hst Thursday for kauai northwest
waters-kauai windward waters-oahu windward waters-kaiwi channel-
maui county windward waters-alenuihaha channel-big island
windward waters-big island southeast waters.

Discussion... Birchard
aviation... Chevalier
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi30 min N 7 G 8 73°F 1014.3 hPa (-0.4)
51205 8 mi30 min 75°F10 ft
51213 30 mi60 min 75°F3 ft
51202 - Mokapu Point, HI (098) 73 mi30 min 74°F7 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI2 mi36 minN 710.00 miPartly Cloudy80°F71°F74%1015 hPa
Lahaina - West Maui, HI12 mi45 minVar 515.00 miPartly Cloudy77°F68°F74%1014.9 hPa

Wind History from HOG (wind in knots)
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Last 24hrN18N17NE8E5E4NW3S5N12
G20
W5NE3CalmNE33S4SE6SE5SE4S3SE5SE3CalmN5N6N7
1 day agoN7N10NE10N13N8N9N4NW4CalmCalm3SE4CalmNE3N8NE19E9
G22
5CalmCalmN5N11NW10N17
G24
2 days agoN10N12N14N12N12N10N9N6NE5N8NE5E3E3CalmE3CalmCalmS3SE6E3N4N9N10N9

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Wed -- 03:27 AM HST     2.79 feet High Tide
Wed -- 06:52 AM HST     Sunrise
Wed -- 07:56 AM HST     Moonset
Wed -- 09:49 AM HST     0.26 feet Low Tide
Wed -- 03:11 PM HST     1.74 feet High Tide
Wed -- 06:26 PM HST     Sunset
Wed -- 08:01 PM HST     Moonrise
Wed -- 09:14 PM HST     -0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.92.42.82.72.41.91.30.70.40.30.40.81.21.61.71.71.30.80.3-0.1-0.3-0.30.1

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Wed -- 04:49 AM HST     2.53 feet High Tide
Wed -- 06:52 AM HST     Sunrise
Wed -- 07:56 AM HST     Moonset
Wed -- 11:14 AM HST     -0.12 feet Low Tide
Wed -- 05:14 PM HST     1.50 feet High Tide
Wed -- 06:26 PM HST     Sunset
Wed -- 08:01 PM HST     Moonrise
Wed -- 10:31 PM HST     -0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.411.62.12.42.52.31.81.20.60.1-0.1-00.20.611.31.51.41.10.70.2-0-0

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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Wind Forecast for (17,4,5,8)
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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.