Friday, July19, 2019 L-36.com


Marine Weather and Tides
Lahaina, HI

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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 5:54AMSunset 7:10PM Friday July 19, 2019 12:42 PM HST (22:42 UTC) Moonrise 9:30PMMoonset 8:21AM Illumination 92% Phase: Waning Gibbous; Moon at 18 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- 931 Am Hst Fri Jul 19 2019
.small craft advisory in effect through Sunday afternoon...
Rest of today..North winds to 30 knots. Wind waves 4 feet.
Tonight..North winds to 30 knots. Wind waves 4 feet.
Saturday..North winds to 25 knots. Wind waves 3 feet.
Saturday night..North winds to 25 knots. Wind waves 3 feet.
Sunday..North winds to 25 knots. Wind waves 3 feet.
Sunday night..North winds 20 knots. Wind waves 3 feet in the evening then 2 feet or less.
Monday..North winds 20 knots. Wind waves 2 feet or less.
Tuesday..North winds 20 knots. Wind waves 3 feet.
PHZ100 931 Am Hst Fri Jul 19 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain fresh to strong trades today, then ease over the weekend as the high weakens. High pressure is expected to persist north of the state through early next week.


7 Day Forecast for Marine Location Near Lahaina, HI
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location: 20.88, -156.68     debug


Area Discussion for -
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Fxhw60 phfo 191945
afdhfo
area forecast discussion
national weather service honolulu hi
945 am hst Fri jul 19 2019

Synopsis
Gusty trade winds will ease slightly through tonight, with moderate
to locally breezy trade winds then persisting into next week. Clouds
and showers will favor windward and mountain area, especially during
nights and mornings. Most leeward areas will remain dry, except
leeward big island, where a few afternoon and evening showers can be
expected.

Discussion
Trade winds will ease to moderate levels through tonight as high
pressure to the distant N weakens slightly. Moderate trade winds
will then continue into early next week, although locally breezy
conditions can be still be expected. The trade winds will deliver
low clouds and showers to windward areas that will occasionally
spread leeward, especially when showery cloud clusters move through.

Anticipating the arrival of such clusters is generally a low skill
endeavor beyond the short term, thus a climatological trade wind
forecast dominates into next week, with showers most active during
nights and mornings.

A trough convergence band to the S and SE of the islands has become
active over the past couple of days, and models have been
inconsistent in depicting various weak lows disturbances briefly
emerging before dissipating, and little significant organization is
currently noted. Models generally agree that the axis of convection
will shift slowly northward through early next week before
weakening. GFS indicates a disturbance developing near 153w this
weekend, and then tracking toward the nw. An associated slug of
moisture moves toward (and over some of) the islands from the S se
from Sunday through Tuesday, while latest 12z ECMWF guidance
continues to keep most of the associated moisture S of the island
chain. The latest official forecast represents a blend of the two
models, indicating the bulk of the moisture passing over coastal
waters just S of the islands early next week. Another disturbance e
of 140w may inject moisture into the trade wind flow that arrives
around the middle of next week, but confidence in that is close to
nil.

In the upper levels, a low aloft centered N of kauai is supplying
instability above about 13000-15000 feet, but a strong subsidence
inversion based near 8000 feet is not allowing surface based parcels
to tap into this instability. The low and associated trough may
bring periods of high clouds into next week before a ridge aloft
develops over the area by the middle of the week.

Aviation
A high will remain nearly stationary far northeast of the main
hawaiian islands and maintain locally strong east winds over the
area through Saturday. Airmet tango is in effect for moderate
turbulence below 7,000ft and this airmet will likely continue into
Saturday.

Broken low clouds cover a large area around the main hawaiian
islands. Most of these clouds are relatively shallow stratocumulus,
but an area of more-showery cumulus has been moving west across the
islands. The back edge of the showery clouds is near oahu. Airmet
sierra for mtn obsc is in effect for oahu and kauai. The area of
showery low clouds should clear the islands this afternoon and we
expect to drop the airmet then.

Marine
Small craft advisory (sca) conditions will continue across all
coastal waters into this afternoon, with fresh to strong trade winds
across the area. Winds will begin to trend down this evening as the
high pressure to the north weakens, leaving SCA winds through the
typically windier waters around the big island and maui county.

Further weakening is possible the beginning of next week, with a
chance of winds falling below the SCA threshold for all waters.

East facing shores will continue to see rough and choppy surf just
below advisory levels in response to the trade wind swell today. As
the winds ease this weekend, the surf will drop slightly. Some small
background south and southwest swells are expected through the
weekend. An increase in surf along south facing shores is possible
early next week as a couple small longer period southwest swells
arrive in the islands.

See the latest oahu surf discussion (srdhfo) for additional details
on surf and swell.

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

Small craft advisory until 6 pm hst this evening for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-oahu
windward waters-oahu leeward waters-kaiwi channel-maui county
windward waters-maui county leeward waters-big island windward
waters.

Discussion... Birchard
aviation... Donaldson
marine... Eaton


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 11 mi60 min NE 18 G 26 81°F 1014.9 hPa
51213 19 mi42 min 83°F4 ft
51202 - Mokapu Point, HI (098) 65 mi42 min 81°F7 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lahaina - West Maui, HI10 mi57 minNE 13 G 2315.00 miPartly Cloudy86°F69°F59%1015.6 hPa
Kahului, Kahului Airport, HI13 mi48 minENE 16 G 3110.00 miPartly Cloudy91°F69°F49%1015 hPa
Lanai City, Lanai Airport, HI16 mi46 minNE 16 G 2010.00 miPartly Cloudy81°F72°F74%1014.8 hPa

Wind History from HJH (wind in knots)
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Last 24hrNE17
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--NE17
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------------------------NE10E14NE10
G18
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1 day agoNE20
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------------------------NE14
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2 days agoNE16
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NE15------------------------NE13NE9
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NE15NE13NE8
G17
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G20

Tide / Current Tables for Lahaina, Maui Island, Hawaii
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Lahaina
Click for Map
Fri -- 12:06 AM HST     0.34 feet Low Tide
Fri -- 05:04 AM HST     0.99 feet High Tide
Fri -- 05:55 AM HST     Sunrise
Fri -- 08:21 AM HST     Moonset
Fri -- 10:04 AM HST     0.28 feet Low Tide
Fri -- 05:27 PM HST     2.26 feet High Tide
Fri -- 07:10 PM HST     Sunset
Fri -- 09:29 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.60.80.910.90.80.60.40.30.30.60.91.31.72.12.22.221.71.30.90.5

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Fri -- 03:08 AM HST     1.35 feet High Tide
Fri -- 05:54 AM HST     Sunrise
Fri -- 08:20 AM HST     Moonset
Fri -- 09:19 AM HST     -0.08 feet Low Tide
Fri -- 04:39 PM HST     2.52 feet High Tide
Fri -- 07:09 PM HST     Sunset
Fri -- 09:29 PM HST     Moonrise
Fri -- 11:17 PM HST     0.79 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.11.31.31.31.10.80.40.1-0.1-00.20.71.21.82.22.52.52.321.61.20.90.8

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (18,4,5,8)
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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.