Sunday, August18, 2019 L-36.com


Marine Weather and Tides
Hana, 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 6:04AMSunset 6:54PM Sunday August 18, 2019 11:31 AM HST (21:31 UTC) Moonrise 9:13PMMoonset 8:41AM Illumination 89% 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- 949 Am Hst Sun Aug 18 2019
Rest of today..Winds variable less than 10 knots becoming north 15 knots in the afternoon. Wind waves 2 feet or less. Isolated showers in the afternoon.
Tonight..Northeast winds 10 knots. Wind waves 2 feet or less.
Monday..Northeast winds 10 knots. Wind waves 2 feet or less. Isolated showers in the afternoon.
Monday night..Northeast winds 10 knots. Wind waves 2 feet or less. South swell 3 feet after midnight.
Tuesday..Northeast winds 20 knots. Wind waves 2 feet or less. South swell 3 feet.
Tuesday night..North winds to 25 knots. Wind waves 2 feet or less. South swell 3 feet. Isolated showers after midnight.
Wednesday..North winds to 25 knots. Wind waves 2 feet or less. South swell 3 feet. Isolated showers.
Thursday..North winds to 25 knots. Wind waves 3 feet.
PHZ100 949 Am Hst Sun Aug 18 2019
Synopsis for hawaiian coastal waters.. High pressure will weaken north of the islands through Monday, then rebuild Tuesday through midweek.


7 Day Forecast for Marine Location Near Hana, HI
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location: 20.77, -155.98     debug


Area Discussion for -
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Fxhw60 phfo 181951
afdhfo
area forecast discussion
national weather service honolulu hi
951 am hst Sun aug 18 2019

Synopsis
A ridge north of the state will weaken today resulting in lighter
trades through Monday. Expect the trades to build again during the
second half of the week as the high pressure rebuilds north of
the area. Showers riding in on the trades will favor the windward
and mountain areas, especially during the nights and early
mornings. Rainfall amounts are expected to be lighter than normal.

Discussion
No changes to the forecast this morning, and no major changes
expected today.

High pressure far northeast of the islands has a ridge north of
the islands. The ridge will be weakening today and tomorrow, which
will result in lighter trade winds across the region. Models are
in good agreement with a new high building in north-northwest of
the islands Tuesday and Wednesday, which will allow the trades to
rebound to moderate to locally breezy levels.

The high lifts northward during the second half of the week, and
an old front to the northeast will could bring some additional
showers in on the trade winds during the latter part of the week.

The upper levels show a high building north of the islands with a
weakening upper level low over the big island. The upper low will
be moving to the west through midweek. A mostly stable atmosphere
is expected to remain in place over the islands, with limited
rainfall amounts. The trades will continue to focus shower
activity over the windward sections.

Aviation
Elongated surface high pressure north of the hawaiian islands will
help to maintain light to moderate easterly flow through this
afternoon. Thus, isolated showers will mainly be limited to
windward and mauka regions. Shower activity is expected to
increase after Sun down along the windward slopes. MVFR
conditions will be possible at times due to lowered visibility and
mountain obscuration.

No airmets are currently in effect.

Marine
Trades are forecast to weaken into the light to moderate category
later today through Monday as the gradient relaxes over the
state. Guidance remains in good agreement Tuesday through the
second half of the week and depicts a strengthening ridge north of
the islands, which supports a return of fresh to locally strong
trades (small craft advisory-level winds in the typically windier
locations between maui county and the big island) by Wednesday.

Surf along south facing shores will remain small through Monday,
with mainly background energy continuing out of the southwest and
southeast. An upward trend is anticipated beginning late Monday,
as one of the largest south swells of the season begins to build
across the hawaiian waters. Surface analysis charts showed a
compact storm-force low bottoming out at 956 mb southeast of new
zealand last Monday through Tuesday within hawaii's swell window.

Ascat passes reflected this and showed a pocket of storm-force
winds nosing northward through this period around the 190 deg
band relative to the islands. Altimeter passes within this area
showed seas ranging from 35 to 42 ft. This swell has already moved
through the nearshore pacioos buoy at pago pago, which showed
seas slightly higher than predicted by guidance. Energy levels
within the lower frequency bands closely resembled the levels
observed at this buoy for our recent july 14th warning-level
event. As a result, surf heights will likely near reach warning
levels along south facing shores through the peak of the event
Tuesday through Tuesday night and may not drop below advisory
levels until Thursday.

The small westerly swell associated with recent typhoon activity
in the western pacific will steadily trend down through Monday.

Surf will respond and lower along the exposed coasts from this
source.

Surf along north and west facing shores may trend up through the
second half of the week as a small northwest swell builds down the
island chain. Guidance remains in good agreement and depicts a
gale evolving around 2000 miles northwest of the islands near and
just west of the date line early this week.

Surf along east facing shores will trend up by midweek as the
trades strengthen locally and upstream of the islands.

Hfo watches warnings advisories
None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 27 mi50 min NNE 9.9 G 16 80°F 1016.6 hPa
ILOH1 - 1617760 - Hilo, HI 87 mi44 min N 4.1 G 4.1 79°F 82°F1016.5 hPa

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI25 mi98 minNE 1810.00 miA Few Clouds and Breezy86°F71°F61%1016.8 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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NE10NE6NE10E4E7E4S3CalmCalmSE3N10NE16NE18NE19
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Tide / Current Tables for Hana, Maui Island, Hawaii
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Hana
Click for Map
Sun -- 04:37 AM HST     1.73 feet High Tide
Sun -- 06:03 AM HST     Sunrise
Sun -- 08:41 AM HST     Moonset
Sun -- 09:56 AM HST     0.42 feet Low Tide
Sun -- 04:43 PM HST     2.33 feet High Tide
Sun -- 06:51 PM HST     Sunset
Sun -- 09:12 PM HST     Moonrise
Sun -- 11:16 PM HST     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.81.21.51.71.71.51.20.80.50.40.50.81.21.622.32.32.11.81.30.90.50.4

Tide / Current Tables for Kihei, Maui (Hawaii)
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Kihei
Click for Map
Sun -- 06:01 AM HST     1.46 feet High Tide
Sun -- 06:05 AM HST     Sunrise
Sun -- 08:43 AM HST     Moonset
Sun -- 11:20 AM HST     0.41 feet Low Tide
Sun -- 06:03 PM HST     2.08 feet High Tide
Sun -- 06:53 PM HST     Sunset
Sun -- 09:14 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.60.91.21.41.51.41.20.90.60.40.50.711.41.722.121.71.30.90.5

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 (17,4,5,8)
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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.