Sunday, May19, 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 5:45AMSunset 6:59PM Sunday May 19, 2019 1:19 AM HST (11:19 UTC) Moonrise 8:08PMMoonset 6:37AM Illumination 100% Phase: Full Moon; Moon at 15 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- 827 Pm Hst Sat May 18 2019
.small craft advisory in effect through early Monday morning...
Rest of tonight..North winds to 25 knots. Wind waves 3 feet.
Sunday..North winds to 25 knots. Wind waves 2 feet or less.
Sunday night..North winds to 25 knots. Wind waves 3 feet in the evening then 2 feet or less.
Monday..North winds 15 knots. Wind waves 2 feet or less.
Monday night..North winds 15 knots in the evening becoming variable less than 10 knots. Wind waves 2 feet or less.
Tuesday..Winds variable less than 10 knots. Wind waves 2 feet or less.
Tuesday night..North winds 10 knots. Wind waves 2 feet or less.
Wednesday..North winds 10 knots. Wind waves 2 feet or less.
Thursday..North winds 15 knots. Wind waves 3 feet.
PHZ100 827 Pm Hst Sat May 18 2019
Synopsis for hawaiian coastal waters.. A surface high far north of the islands will persist through Sunday, then move far northeast of the state early next week as a front approaches from the northwest. The front is expected to weaken and stall northwest of the area during the middle of next week.


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 190621
afdhfo
area forecast discussion
national weather service honolulu hi
821 pm hst Sat may 18 2019

Synopsis
A high pressure system northeast of the hawaiian islands will
keep trade winds in the forecast with scattered overnight and
early morning showers through Sunday. A cold front approaching
from the northwest will break down the ridge north of the islands
as trade winds transition to light and variable from Monday into
Tuesday. A light easterly background wind flow will allow land and
sea breezes to develop over leeward areas of each island from
Tuesday through Friday. Clouds and isolated to scattered showers
during this period will favor windward mountain and interior
sections of each island in the afternoon and early evening hours.

Discussion
A broad high pressure ridge 500 miles north of the islands will
keep moderate trade winds in the forecast through Sunday night with
scattered showers favoring windward and mountain areas in the
overnight and early morning hours. On Monday the large scale
weather pattern changes as a cold front approaches the islands
from the northwest breaking down the ridge. Decreasing surface
pressure gradients over the islands on Monday will cause surface
winds to weaken and veer towards the east southeast. Two upper level
disturbances passing over kauai may produce elevated showers from
kauai to oahu on Monday and Tuesday.

These lighter wind speeds will continue through the work week
with a light easterly wind flow interacting with land and sea
breezes forming along leeward slopes of each island. Weather
conditions will feel hot and humid next week due to the light wind
pattern and high Sun angle this time of year. Most islands will
see clouds building over island interior sections with isolated to
scattered showers trending towards the afternoon and early evening
hours. Scatterd showers will develop along sea breeze and light
trade wind convergence zones. Wind directions near these
leeward convergence zones will become more erratic and variable in
the afternoon hours as light background winds fight with sea
breezes for dominance.

Extended outlook weather model solutions suggest we may return to
moderate trade winds by next weekend. However, this far out in
the forecast cycle our confidence remains only fair that these
trade wind speeds will be strong enough to overcome an established
land and sea breeze cycle along leeward slopes. Much will depend
upon the strength of the high pressure ridge north of the islands.

Aviation
The locally strong low-level trade wind flow will persist through
Sunday afternoon. Low clouds and showers transported by the
trades will continue to affect windward facing slopes through
Sunday. Expect brief periods of MVFR conditions to occur over
north through east facing sections due to lower ceilings and
reduced visibilities, especially from late tonight through Sunday
morning. Otherwise, expectVFR conditions to prevail.

No airmets are currently in effect. We will monitor satellite
imagery overnight in case airmet sierra might be required for
mountain obscuration over some windward areas. In addition, based
on the vad wind profiles across the state, we do not see a need
for airmet tango for low-level mechanical turbulence leeward of
the higher terrain.

Marine
High pressure northeast of the state will maintain moderate to
locally strong trade winds through the weekend. As a result, a
small craft advisory (sca) remains in effect for the typically
windy waters around maui and the big island through 6 am Monday.

The winds will ease and shift around to the east-southeast early
next week as the high moves northeast and a cold front approaches
from the northwest. The front will then stall northwest of the
area during the middle and latter part of next week, while high
pressure strengthens northeast of the island chain. This will
bring a slight increase in the east to east-southeasterly winds
Tuesday night through Friday.

A series of small southwest and south swells will produce small
to moderate surf along south facing shores through the middle of
next week. A low pressure system currently developing southeast
of new zealand is expected to strengthen tonight into Sunday and
will likely produce a long-period south-southwest swell for next
weekend. If this storm materializes as expected, surf may
approach the high surf advisory criteria memorial day weekend.

A small northwest swell will fill in tonight, peak on Sunday,
then gradually lower into early next week. Another small to
moderate sized northwest swell is possible late next week into
next weekend. Small, choppy surf along east facing shores may get
a slight boost on Sunday due to the stronger trade winds. Another
increase around mid-week is possible due to a developing fetch of
moderate trades east of the islands.

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

Discussion... Bohlin
aviation... Houston
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 0 mi49 min ENE 5.1 G 11 1018.3 hPa
51205 8 mi49 min 78°F5 ft
51213 30 mi49 min 79°F4 ft
51202 - Mokapu Point, HI (098) 73 mi49 min 78°F5 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 mi25 minN 010.00 miFair73°F66°F81%1018.5 hPa

Wind History from HOG (wind in knots)
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Last 24hrE83NE10N9NE11NE12NE11NE15
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NE15NE15NE8NE7Calm
1 day agoNE14NE8NE5E4SE4CalmNE7NE14N14NE19NE19NE20N19NE15NE17
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NE16NE19NE11NE13NE12NE8NE11NE8
2 days agoNE14NE17
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NE18NE19N16N13NE17NE14NE12NE18NE10NE11NE14N15NE13

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Sun -- 01:54 AM HST     1.51 feet High Tide
Sun -- 05:46 AM HST     Sunrise
Sun -- 06:37 AM HST     Moonset
Sun -- 08:17 AM HST     -0.50 feet Low Tide
Sun -- 03:32 PM HST     2.61 feet High Tide
Sun -- 06:58 PM HST     Sunset
Sun -- 08:08 PM HST     Moonrise
Sun -- 09:57 PM HST     0.73 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.41.51.41.10.60.1-0.3-0.5-0.4-0.10.51.11.82.32.62.62.421.51.10.80.70.8

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Sun -- 04:00 AM HST     0.99 feet High Tide
Sun -- 05:47 AM HST     Sunrise
Sun -- 06:37 AM HST     Moonset
Sun -- 09:16 AM HST     -0.30 feet Low Tide
Sun -- 05:00 PM HST     2.40 feet High Tide
Sun -- 06:57 PM HST     Sunset
Sun -- 08:08 PM HST     Moonrise
Sun -- 11:51 PM HST     0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.40.70.910.90.60.2-0.1-0.3-0.2-00.40.91.522.32.42.31.91.40.90.40.2

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 (7,2,3,4)
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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.