Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Makena, HI

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 5:45AMSunset 6:59PM Sunday May 20, 2018 7:44 AM HST (17:44 UTC) Moonrise 11:09AMMoonset 12:00AM Illumination 33% Phase: Waxing Crescent; Moon at 6 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- 343 Am Hst Sun May 20 2018
.small craft advisory in effect through Monday afternoon...
Today..Northeast winds to 30 knots. Wind waves 3 feet. Scattered showers.
Tonight..Northeast winds to 25 knots. Wind waves 3 feet. Scattered showers in the evening.
Monday..Northeast winds to 25 knots. Wind waves 2 feet or less.
Monday night..Northeast winds to 25 knots. Wind waves 2 feet or less.
Tuesday..North winds to 25 knots. Wind waves 2 feet or less.
Tuesday night..Northeast winds to 25 knots. Wind waves 2 feet or less.
Wednesday..Northeast winds to 25 knots. Wind waves 2 feet or less.
Thursday..Northeast winds to 25 knots. Wind waves 2 feet or less.
PHZ100 343 Am Hst Sun May 20 2018
Synopsis for hawaiian coastal waters.. High pressure will remain north of the waters through tonight, then shift eastward and weaken through the first half of the week as a front passes far to the north.

7 Day Forecast for Marine Location Near Makena, HI
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location: 20.6, -156.6     debug


Area Discussion for -
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Fxhw60 phfo 201358
afdhfo
area forecast discussion
national weather service honolulu hi
358 am hst Sun may 20 2018

Synopsis
A surface ridge will persist north of the islands through the
coming week.

Discussion
As of 3 am, surface observations and satellite loops show locally
breezy easterly trade winds blowing across the islands. There are
broken low clouds over windward areas of kauai, oahu, lanai and molokai,
mostly stable clouds, with scattered clouds over lee areas. Radars
show mostly dry conditions from kauai to lanai. Satellite loops
show a 120 mile wide band of showery low clouds extending about
350 miles east northeast from over the windward side of the big
island. Numerous showers from this band are moving over the windward
side of the big island with some of the showers spreading over windward
east maui. Clouds are scattered to broken over the leeward sides of
the big island and maui. Little change is expected through early this
morning.

A surface ridge north of the area will continue to produce locally
breezy trade winds. The ridge will weaken slightly over the next
few days as a front approaches from the northwest. The front will
stall well north of the islands on Monday. A strong new high will
build northwest of the islands by the middle of next week.

The cloud band moving over the big island this morning will keep the
windward side of that island rather cloudy and rainy through tonight.

Trade winds will push additional bands of showery low clouds over
the islands through the coming week. Ridging aloft will keep the
atmosphere relatively stable so showers will be focused over mainly
windward areas, and excessive rainfall is not expected. Lower
leeward areas will remain mostly dry except for afternoon showers
over the lee slopes of the big island and east maui.

Close monitoring of kilauea on the big island continues, as
hawaii volcano observatory personnel indicate that additional
steam-driven explosions are possible at any time. Ashfall
advisories or warnings will be issued if necessary.

Aviation
The gusty low-level trade wind flow will persist today. Ridging
aloft is maintaining stable atmospheric conditions with a
relatively strong low-level inversion between 5,000 and 7,000 ft.

As a result, low-level mechanical turbulence will continue
leeward of the higher terrain on all islands today, and airmet
tango remains in effect.

Low clouds and showers transported by the robust low-level trade
wind flow are streaming into portions of the windward sides of
some islands, especially the windward big island. This will likely
result in brief periods of MVFR conditions. Airmet sierra remains
in effect for mountain obscuration along the windward big island
this morning. Otherwise,VFR conditions are expected to prevail.

A series of steam-driven explosions, which produced volcanic ash,
occurred at the kilauea halemaumau crater on Saturday. Conditions
appear to have remained quiet so far early this morning.

Therefore, no sigmet for volcanic ash is in effect at the moment.

Experts from the hawaii volcano observatory continue to emphasize
that additional explosive episodes may occur at any time, and
with no advance warning.

Marine
Fresh to strong trades associated with high pressure north of the
waters are forecast to hold through much of the week. The
overnight ascat pass showed 25 to 30 knot winds across all
hawaiian waters. As a result, the small craft advisory has been
expanded to include all waters through the day today. Seas have
responded and will remain rough, likely remaining near or at the
advisory level (10 ft) south of the big island and across the
alenuihaha channel through the rest of the weekend. A weakness
within the ridge is forecast to develop by Tuesday as a front
passes far north of the area, which may translate to the strong
trades slightly weakening locally for a brief period. The advisory
only includes the typically windier channel waters, waters south
of the big island and maalaea bay tonight through Monday.

Two overlapping long-period south-southwest (190-200 deg) swells
from a couple of sources that passed near new zealand around a week
ago will continue to impact south facing shores today. The latest
observations from the nearshore pacioos buoys near pearl harbor
showed the peak energy coming in within the 16-18 sec band, which
was slightly higher than anticipated. Surf heights associated
with this energy may be near the surf advisory level (8 ft faces)
for south facing shores through the early morning hours today
before gradually easing tonight into Monday. Another similar
pulse out of the south-southwest is expected through midweek or by
Thursday.

Up north, surf associated with the north-northwest (330-350 deg)
swell that filled in and peaked Friday will continue to fade
today. Another small north-northwest pulse could bring the surf
back to similar levels that were reached on Friday by midweek
along north facing shores. Otherwise, surf will continue to focus
at select reefs exposed to trade wind energy wrapping in.

Surf along east facing shores will remain rough as fresh to
strong trades hold locally and upstream south of high pressure.

Heights should remain below advisory levels for east facing
shores today. A gradual downward trend is expected through the
first half of the week as a front passes to the north and the
large area of upstream fresh breezes weaken.

For the long range, guidance continues to depict plenty of energy
setting up within hawaii's swell window from the tasman sea early
next week. ECMWF and GFS show back-to-back gales nosing northward
through the tasman focusing energy down the 200-220 deg
directional band Sunday night through Wednesday. Wavewatch iii
depicts two main long-period pulses from these sources out of 220
deg filling in at pago pago with the first source arriving
Wednesday night (5 24) and the second pulse arriving Thursday
night (5 25). If this scenario evolves as predicted, these sources
should make it to the local hawaiian waters toward the end of the
month (around 5 29).

Hfo watches warnings advisories
Small craft advisory until 6 pm today for all hawaiian waters.

Discussion... Donaldson
aviation... Houston
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 22 mi44 min NE 12 G 18 76°F 79°F1018.6 hPa (+1.3)
51205 30 mi44 min 77°F9 ft
51202 - Mokapu Point, HI (098) 80 mi40 min 77°F8 ft

Wind History for Kahului, Kahului Harbor, HI
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G12
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NE7
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI23 mi50 minENE 11 G 1710.00 miPartly Cloudy72°F70°F94%1018.9 hPa

Wind History from HNY (wind in knots)
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Last 24hr------------------------NE10NE10NE10NE10NE10NE12NE12NE12NE10NE10NE10NE4
1 day ago--------------------------E10E5E5E10NE12E12E5E8E5E5NE10
2 days ago------------------------E5E5E4E4E4----E4NE10NE4NE7--

Tide / Current Tables for Kuheia Bay, Kahoolawe Island, Hawaii
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Kuheia Bay
Click for Map
Sun -- 03:39 AM HST     -0.04 feet Low Tide
Sun -- 05:47 AM HST     Sunrise
Sun -- 08:53 AM HST     0.71 feet High Tide
Sun -- 11:09 AM HST     Moonrise
Sun -- 01:16 PM HST     0.18 feet Low Tide
Sun -- 06:58 PM HST     Sunset
Sun -- 08:53 PM HST     2.14 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.50.2-0-00.10.30.50.70.70.60.50.30.20.20.40.711.41.82.12.121.7

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Sun -- 03:10 AM HST     0.08 feet Low Tide
Sun -- 05:46 AM HST     Sunrise
Sun -- 08:59 AM HST     0.88 feet High Tide
Sun -- 11:08 AM HST     Moonrise
Sun -- 01:33 PM HST     0.25 feet Low Tide
Sun -- 06:58 PM HST     Sunset
Sun -- 09:00 PM HST     2.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.50.20.10.10.30.50.70.80.90.80.60.40.30.30.40.71.11.51.92.12.22.11.8

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.
Link to Loop

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Wind Forecast for (13,3,4,5)
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Ground Weather Radar Station Kohala, 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.