Thursday, March21, 2019 L-36.com


Marine Weather and Tides
Halaula, 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 6:22AMSunset 6:32PM Thursday March 21, 2019 1:49 AM HST (11:49 UTC) Moonrise 7:42PMMoonset 7:12AM 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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PHZ121 Alenuihaha Channel- 931 Pm Hst Wed Mar 20 2019
Rest of tonight..East winds 15 knots. Wind waves 4 feet. Northwest swell 9 feet and north 3 feet.
Thursday..Northeast winds 20 knots. Wind waves 5 feet. Northwest swell 8 feet. Isolated showers in the morning. Scattered showers in the afternoon.
Thursday night..East winds 20 knots. Wind waves 7 feet. Northwest swell 8 feet. Isolated showers.
Friday..East winds 20 knots. Wind waves 8 feet. Northwest swell 8 feet. Isolated showers in the afternoon.
Friday night..East winds 20 knots. Wind waves 8 feet. Northwest swell 9 feet. Isolated showers.
Saturday..East winds 20 knots. Wind waves 8 feet. Northwest swell 8 feet. Scattered showers.
Saturday night..Northeast winds 20 knots. Wind waves 9 feet. Northwest swell 7 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 10 to 11 feet. North swell 6 to 7 feet. Isolated showers.
Monday..Northeast winds 20 knots. Wind waves 8 to 9 feet. North swell 6 feet. Isolated showers.
PHZ100 931 Pm Hst Wed Mar 20 2019
Synopsis for hawaiian coastal waters.. High pressure will build north of the area Thursday through Saturday, then strengthen Saturday night through Sunday.


7 Day Forecast for Marine Location Near Halaula, HI
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location: 20.24, -155.77     debug


Area Discussion for -
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Fxhw60 phfo 210632
afdhfo
area forecast discussion
national weather service honolulu hi
832 pm hst Wed mar 20 2019

Synopsis
Stable and dry conditions will persist across the islands tonight,
due to high pressure to the northeast. Trade winds will increase
Thursday and Friday as a cold front approaches from the northwest.

This front will be close enough to usher in increased clouds and
showers across the area Saturday and Sunday.

Discussion
A dry and stable airmass remains over the area, with afternoon
soundings showing less than an inch of pw, positive lifted index
values and a strong inversion base between 6000 and 8000 feet. The
subtropical ridge lies just north of the islands this evening and
the slack pressure gradient keeps winds quite light. The pressure
gradient should strengthen over the next day or so as a cold front
approaches from the northwest, which will increase our trade
winds. The front will continue to move towards the islands
through the end of the week, and then dissipate and or move to the
east of the islands.

Models show the front will stall just north of the islands, but
will be close enough to bring increased moisture, along with
stronger winds, a fair distance ahead of it. Moisture will
continue to increase as the front comes closest to the islands
Saturday and Sunday. With winds expected to remain out of a trade
wind direction, rainfall will focus over windward and mauka areas.

However, leeward areas will get wet as well from time to time.

Models show high pressure will approach from the northwest on
Monday, then move north of the islands Monday night and Tuesday.

This will maintain trade wind flow and, with leftover frontal
moisture across the region, we expect a wet trade wind pattern to
last from Tuesday through the rest of the forecast period.

Aviation
Trade winds will be returning overnight, and so will be
the trade wind showers, especially toward daybreak Thursday.

Currently, afternoon clouds are clearing out mainly the lee areas
of all islands. Clouds over the windward and mountain sections
appear to be clearing out as well, but they will likely stay in
place and be the source of trade showers later tonight. Cloud tops
are around 7k feet, with higher tops at 10k feet in showers. No
airmets at the present time, but with the strengthening trades to
moderate to locally strong through 21 20z, we probably need airmet
tango for low level turb after 16z.

Marine
Trades will steadily fill in across the state overnight into
Thursday as a ridge of high pressure noses eastward in the wake of
a front passing to the north. Trades will reach the moderate to
fresh category early Thursday, then the fresh to strong category
Thursday night through the weekend as high pressure sets up to
the north. Strongest winds are expected over the typical windier
channel waters and areas around maui county and the big island. A
combination of overlapping north to northwest swells and wind
waves rising from the strengthening trades will lead to small
craft advisory (sca) conditions over exposed waters late Thursday
through early next week. Trades should begin to weaken Tuesday
through the midweek time frame as the ridge shifts south toward
the area and another front passes to the north.

Surf along north and west facing shores is expected to hold around
advisory levels through early Saturday due to the active pattern
over the northern pacific this week, then steadily ease over the
late Saturday through Monday.

The new long-period northwest swell that filled in through the
day has peaked at the hanalei and waimea nearshore pacioos buoys
and near the peak at pauwela this evening. Observations at the
offshore buoys northwest of the state have been steadily trending
down through the afternoon hours, which should be reflected at the
local buoys later tonight into Thursday. This downward trend will
be short-lived due to a subtle reinforcement expected Thursday,
which should be enough to keep the surf up around advisory levels
into Thursday night along north and west facing shores.

As this source eases Friday, a new long-period north-northwest
swell will fill in, which will support advisory-level surf
continuing along north facing shores late Friday into Saturday
before dropping below by Saturday afternoon. Heights along west
facing shores will likely drop below advisory levels by Friday
night due to the more northerly angle of the reinforcement.

Although the surf will remain below advisory levels late Saturday
through Sunday, a smaller reinforcement out of the northwest will
continue to deliver solid surf for north and west facing shores
Sunday for late march.

For next week, a small moderate period north swell expected
Monday night will keep the surf up for locations that favor this
direction through the day Tuesday. A moderate long-period
northwest swell will become a possibility Wednesday through
Thursday, that could generate near advisory level surf by
Thursday.

Surf along east facing shores will remain small through Thursday,
then rise Friday through the weekend as fresh to strong trades
return. A downward trend will be possible by the midweek time
frame of next week as the trades weaken.

Surf along south facing shores will remain small each day with
mainly background long period southerly pulses and short-period
southeast energy expected.

Hfo watches warnings advisories
High surf advisory until 6 am hst Friday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
haleakala.

Discussion... Powell
aviation... Lau
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 14 mi37 min ESE 1.9 G 2.9 73°F 77°F1017.3 hPa
ILOH1 - 1617760 - Hilo, HI 52 mi31 min S 1 G 1.9 66°F 76°F1016.9 hPa
KLIH1 - 1615680 - Kahului Bay, Maui, HI 58 mi37 min NNW 7 G 11 72°F 1018.1 hPa

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bradshaw Army Air Field / Hawaii, HI34 mi1.9 hrsSE 310.00 miFair48°F27°F45%1015.5 hPa

Wind History from HSF (wind in knots)
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Last 24hrSE3CalmSE4SE4CalmCalm--W3W4W5W4W9SW6--W7W5W5----------SE3Calm
1 day agoCalmCalmSE4CalmSE3S4Calm--W3W7W5--W7W7W6W5W3--SE3CalmCalmCalmCalmSE4
2 days agoCalm--SE4SE3--SW4SW4W3----W6SW8W6W7--W5W4----SE3SE4SE3SE4SE4

Tide / Current Tables for Mahukona, Hawaii Island, Hawaii
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Mahukona
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Thu -- 03:56 AM HST     1.86 feet High Tide
Thu -- 06:26 AM HST     Sunrise
Thu -- 07:11 AM HST     Moonset
Thu -- 10:28 AM HST     -0.23 feet Low Tide
Thu -- 04:31 PM HST     1.65 feet High Tide
Thu -- 06:34 PM HST     Sunset
Thu -- 07:42 PM HST     Moonrise
Thu -- 10:41 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.91.41.81.91.71.40.90.40-0.2-0.20.10.511.41.61.61.41.10.60.30-0

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
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Thu -- 04:27 AM HST     2.20 feet High Tide
Thu -- 06:26 AM HST     Sunrise
Thu -- 07:11 AM HST     Moonset
Thu -- 10:48 AM HST     -0.15 feet Low Tide
Thu -- 04:57 PM HST     1.94 feet High Tide
Thu -- 06:34 PM HST     Sunset
Thu -- 07:41 PM HST     Moonrise
Thu -- 10:59 PM HST     0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.91.41.92.22.21.91.40.80.3-0.1-0.100.511.51.81.91.81.410.50.10

Weather Map and Satellite Images
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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 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.