Monday, August19, 2019 L-36.com


Marine Weather and Tides
Kapalua, 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 6:05AMSunset 6:54PM Monday August 19, 2019 10:16 AM HST (20:16 UTC) Moonrise 9:49PMMoonset 9:33AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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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PHZ120 Pailolo Channel- 954 Am Hst Mon Aug 19 2019
Rest of today..East winds 20 knots. Wind waves 4 feet. South swell 3 feet in the afternoon. Isolated showers.
Tonight..East winds 20 knots. Wind waves 4 feet. South swell 3 feet. Isolated showers in the evening. Scattered showers after midnight.
Tuesday..East winds 20 knots. Wind waves 4 feet. South swell 5 feet. Scattered showers in the morning. Isolated showers in the afternoon.
Tuesday night..East winds to 25 knots. Wind waves 5 feet. South swell 5 feet. Isolated showers in the evening. Scattered showers after midnight.
Wednesday..East winds to 25 knots. Wind waves 5 feet. South swell 5 feet. Isolated showers in the morning.
Wednesday night..East winds to 25 knots. Wind waves 5 feet. South swell 4 feet. Isolated showers.
Thursday..East winds 20 knots. Wind waves 3 to 4 feet. South swell 3 to 4 feet. Isolated showers.
Friday..East winds 20 knots. Wind waves 4 feet. Isolated showers.
PHZ100 954 Am Hst Mon Aug 19 2019
Synopsis for hawaiian coastal waters.. A surface ridge north of the islands will weaken and shift south today. A new surface high pressure system will build north of the state from tonight through mid-week. A front approaching from the north later this week may cause the trade winds to weaken slightly from Thursday into Friday.


7 Day Forecast for Marine Location Near Kapalua, HI
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location: 21.02, -156.64     debug


Area Discussion for -
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Fxhw60 phfo 191943
afdhfo
area forecast discussion
national weather service honolulu hi
943 am hst Mon aug 19 2019

Synopsis
A building ridge north of the state will maintain a trade wind
pattern through the upcoming weekend. Showers will be focused over
windward and mountains areas in this flow. Light to moderate trade
winds will persist with periods of moderate to locally breezy
trades in the middle of the week and again for the weekend.

Discussion
The overnight analysis depicts a 1017 mb high pressure system
about 575 miles northwest of kauai, with a building east to west
oriented ridge. There is good model agreement with the weather
pattern near the islands into the weekend. The surface ridge to
the north strengthens, allowing the trade winds to rebound to
moderate to locally breezy levels Tuesday night and Wednesday.

Some weak troughing over the state could weaken winds a bit
Thursday and Friday, but expecting winds to rebound again this
weekend.

The background trade wind flow will focus shower activity over the
windward sides of the islands. Models show various batches of
moisture riding in on the trades through the week, so there will
be at times periods of increased shower activity. However, despite
the periods of increased activity, it should primarily be more
typical trade wind showers versus the drier than normal activity
we have seen as of late.

Towards the end of the week, moisture from an old front to the
northeast of the islands will move towards the islands. The models
have thus far been pretty consistent with the bulk of that
moisture staying north of the islands, with some of it skirting
kauai and perhaps oahu. Currently the forecast reflects a more
typical trade wind pattern, but as we get closer will make
adjustments based on the higher resolution models.

Longer term, we are seeing model differences and run to run
differences primarily with the gfs. The current forecast maintains
the trade wind flow for the start of the new week.

The forecast remains on track so no changes to the forecast at
this time.

Aviation
Once again, an elongated surface high to the north of the state
will act to maintain weak to moderate east northeast trades
through this afternoon. Conditions will be rather dry except for
isolated showers that develop either on the windward side of the
islands or over the mountain ridges. After Sun down, showers will
increase in coverage along the windward slopes, possibly leading
to MVFR conditions at times.

No airmets are currently in effect.

Marine
A nearly east to west oriented surface ridge located about 300 nm
north of lihue is forecast to weaken and shift southward later
today. This will result in light to moderate northeast trade
winds across the hawaiian coastal waters. As a new surface high
pressure system builds north of state from tonight through mid-
week, east-northeast trade winds will gradually strengthen. Based
on the latest forecast, trade winds are expected to reach the
small craft advisory (sca) threshold starting Tuesday night
across the typically windier waters adjacent to the islands of
maui county and the big island. These SCA conditions may persist
over these waters through Wednesday night. A weak surface front
approaching the area from the north later this week is expected
to cause a slight disruption in the pressure gradient over the
region. Therefore, the trade winds are forecast to weaken
slightly from Thursday through Friday.

Surf along south facing shores will slowly build through the day
today as a new large, long-period south-southwest swell begins to
spread across the hawaiian waters. Long-period forerunners are
starting to register on the offshore buoys at NOAA buoy 51002 and
51004, which should be filling in this afternoon. Surf is expected
to rise above the seasonal average by late this evening and is
expected to reach advisory levels by tonight. As this swell passed
through the pacioos buoy at pago pago several days ago, it
registered swell heights and energy levels slightly higher than
our recent mid-july 2019 warning-level event along south facing
shores. The possible limiting factor for this swell event in
hawaii was that the storm was slightly more compact compared with
other high surf events. We will be monitoring observations in case
a high surf warning might be required during the peak of this
event on Tuesday or Tuesday night. The surf may not drop below the
hsa criteria along south facing shores until Thursday based on
the latest guidance.

The small west swell associated with recent tropical cyclones in
the northwest pacific will steadily trend down today. Surf along
north and west facing shores of the smaller islands may increase
from late Wednesday through Friday as small northwest swells
spread down the island chain. Small, choppy surf may trend up
slightly along east facing shores later this week as the trades
strengthen.

Hfo watches warnings advisories
None.

Discussion... M ballard
aviation... Thomas
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 13 mi52 min N 6 G 13 80°F 1015.9 hPa
51213 27 mi46 min 84°F3 ft
51202 - Mokapu Point, HI (098) 61 mi16 min 82°F4 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI1 mi26 minNE 9 G 1615.00 miPartly Cloudy86°F64°F49%1015.9 hPa
Kahului, Kahului Airport, HI14 mi22 minNNE 1610.00 miA Few Clouds88°F68°F52%1016.1 hPa
Lanai City, Lanai Airport, HI23 mi20 minno data10.00 miFair80°F66°F64%0 hPa

Link to 5 minute data for PHJH

Wind History from HJH (wind in knots)
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Last 24hrNE12NE12--NE17NE15NE14NE14NE14------------------------E6NE7NE9NE9
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1 day agoNE12NE14NE14NE14NE15NE15NE14NE13------------------------NE6NE7NE8NE11
2 days agoNE12
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NE13NE14NE13------------------------E10NE13NE14NE13

Tide / Current Tables for Pukoo Harbor, Molokai Island, Hawaii
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Pukoo Harbor
Click for Map
Mon -- 05:32 AM HST     1.39 feet High Tide
Mon -- 06:07 AM HST     Sunrise
Mon -- 09:33 AM HST     Moonset
Mon -- 11:17 AM HST     0.56 feet Low Tide
Mon -- 05:22 PM HST     1.75 feet High Tide
Mon -- 06:54 PM HST     Sunset
Mon -- 09:49 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.711.21.41.41.31.10.80.70.60.60.811.31.61.71.71.61.310.70.5

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Mon -- 06:00 AM HST     1.49 feet High Tide
Mon -- 06:06 AM HST     Sunrise
Mon -- 09:33 AM HST     Moonset
Mon -- 11:25 AM HST     0.66 feet Low Tide
Mon -- 05:50 PM HST     1.85 feet High Tide
Mon -- 06:53 PM HST     Sunset
Mon -- 09:49 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.711.21.41.51.41.210.80.70.70.81.11.31.61.81.81.71.51.20.90.6

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 (16,3,4,5)
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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.