Monday, August19, 2019 L-36.com


Marine Weather and Tides
Haiku-Pauwela, HI

Version 3.4
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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 6:05AMSunset 6:53PM Monday August 19, 2019 3:50 AM HST (13:50 UTC) Moonrise 9:48PMMoonset 9:31AM Illumination 84% Phase: Waning Gibbous; Moon at 19 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- 344 Am Hst Mon Aug 19 2019
Today..North winds 20 knots. Wind waves 2 feet or less.
Tonight..North winds 20 knots. Wind waves 2 feet or less. South swell 3 feet after midnight.
Tuesday..North winds 20 knots. Wind waves 2 feet or less. South swell 3 feet.
Tuesday night..North winds to 25 knots. Wind waves 3 feet. South swell 3 feet.
Wednesday..North winds to 25 knots. Wind waves 3 feet. South swell 3 feet.
Wednesday night..North winds to 25 knots. Wind waves 3 feet. South swell 3 feet.
Thursday..North winds 20 knots. Wind waves 3 feet. South swell 3 feet.
Friday..North winds 20 knots. Wind waves 2 feet or less.
PHZ100 344 Am Hst Mon Aug 19 2019
Synopsis for hawaiian coastal waters.. A surface ridge north of the islands will weaken and shift south today. A new surface high pressure system will build north of the state from tonight through mid-week. A front approaching from the north later this week may cause the trade winds to weaken slightly from Thursday into Friday.


7 Day Forecast for Marine Location Near Haiku-Pauwela, HI
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location: 20.92, -156.28     debug


Area Discussion for -
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Fxhw60 phfo 191341
afdhfo
area forecast discussion
national weather service honolulu hi
341 am hst Mon aug 19 2019

Synopsis
A ridge of high pressure north of the state will keep trade winds
blowing through the weekend. The trades will strengthen a bit
during the middle of the work week, and again next weekend,
otherwise light to moderate trades will prevail. Showers will
favor windward and mauka areas, particularly during the overnight
and early morning hours. A bit of an increase in shower activity
is expected tonight through Tuesday night, particularly across
windward sections of maui county and the big island. A bit more
showery weather is also expected Thursday night through Friday
night, as a front approaches from the north. Otherwise fairly dry
trade wind weather will prevail.

Discussion
Currently at the surface, a east to west oriented ridge of high
pressure is located around 325 miles north of kauai. The resulting
gradient is producing light to moderate trade winds across the
island chain early this morning. Infrared satellite imagery shows
clear to partly cloudy skies in place in most areas, with some
more extensive cloud cover lingering over leeward sections of the
big island. Radar imagery shows a few light showers moving into
windward areas, with mainly rain free conditions in leeward
sections. Main short term concerns revolve around rain chances and
trade wind trends over the next few days.

A ridge of high pressure will remain north of the state through
the forecast period, keeping trade winds blowing across the island
chain. Light to moderate trades will continue through Tuesday
night, although we should see a slight increase in trade wind
speeds Monday night through Tuesday night as a weak trough of low
pressure slides by to the south of the islands. Generally dry,
stable trade wind weather will prevail today, with light showers
mainly affecting windward and mauka areas. With the trough sliding
by south of the state, we should see an increase in trade wind
showers tonight through Tuesday night, particularly across
windward sections of maui county and the big island.

Drier more stable conditions along with moderate to locally
breezy trade winds are expected to return Wednesday through
Thursday, with windward and mauka areas remaining the main shower
targets. A digging upper level trough north of the state in the
vicinity of 30n, will drive a frontal boundary southward toward
the islands Thursday night through Friday night, easing the trade
winds back into the moderate range. Although the front isn't
expected to make it southward into the state, elevated inversion
heights and an increase in boundary layer moisture should bring
more trade wind showers to the islands for the tail end of the
work week as well.

High pressure will then build northeast of the state next
weekend, with deep layer ridging stabilizing the airmass over the
islands as the upper level trough retrogrades westward. As a
result, we should see a return of fairly dry trade wind weather
and moderate to locally breezy conditions.

Aviation
Light to moderate trades winds will continue through the period.

Clouds and showers will favor windward and mountain locations,
mainly through the overnight and early morning hours. Mostly dry
conditions will prevail over leeward areas, with the exception
being over the big island where clouds and showers form (best
coverage through the afternoon and evening hours). Brief periods
with MVFR CIGS and vsbys will be possible in and around showers.

No airmets are currently in effect.

Marine
A nearly east to west oriented surface ridge located about 300 nm
north of lihue is forecast to weaken and shift southward later
today. This will result in light to moderate northeast trade
winds across the hawaiian coastal waters. As a new surface high
pressure system builds north of state from tonight through mid-
week, east-northeast trade winds will gradually strengthen. Based
on the latest forecast, trade winds are expected to reach the
small craft advisory (sca) threshold starting Tuesday night
across the typically windier waters adjacent to the islands of
maui county and the big island. These SCA conditions may persist
over these waters through Wednesday night. A weak surface front
approaching the area from the north later this week is expected
to cause a slight disruption in the pressure gradient over the
region. Therefore, the trade winds are forecast to weaken
slightly from Thursday through Friday.

Surf along south facing shores will remain small early today,
with mainly background swell energy from the southwest and
southeast. An upward trend in surf is anticipated beginning later
today as a new large, long-period south swell begins to spread
across the hawaiian waters. Surface analysis charts showed a
compact 956 mb storm-force low southeast of new zealand early
last week, which produced a captured fetch aimed toward hawaii's
swell window. Data from scatterometer passes confirmed an area of
storm-force winds aimed northward during this time period. In
addition, altimeter passes within this area showed seas ranging
from 35 to 42 feet. This swell has already moved through the
nearshore pacioos buoy at pago pago, which showed seas and energy
levels that were slightly higher than our recent mid-july 2019
warning-level event along south facing shores. The possible
limiting factor for this swell event in hawaii was that the storm
was slightly more compact compared with other high surf events.

Expect a high surf advisory (hsa) to be issued for south facing
shores starting tonight. We will be monitoring observations in
case a high surf warning might be required during the peak of
this event on Tuesday or Tuesday night. The surf may not drop
below the hsa criteria along south facing shores until Thursday
based on the latest guidance.

The small west swell associated with recent tropical cyclones in
the northwest pacific will steadily trend down today. Surf along
north and west facing shores of the smaller islands may increase
from late Wednesday through Friday as small northwest swells
spread down the island chain. Small, choppy surf may trend up
slightly along east facing shores later this week as the trades
strengthen.

Hfo watches warnings advisories
None.

Discussion... Jelsema
aviation... Gibbs
marine... Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 10 mi57 min N 6 G 6 78°F 1014.7 hPa
51213 40 mi111 min 84°F4 ft
51202 - Mokapu Point, HI (098) 82 mi51 min 82°F4 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI8 mi57 minN 510.00 miFair76°F69°F79%1015.1 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrS3CalmCalmSE3N10NE16NE18NE19NE23NE21NE22NE17NE17NE14N12NE16NE12NE10NE12NE9E3CalmNE7N5
1 day agoNE11NE11NE10NE8NE14E14
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2 days agoNE9SW7E7E4E9
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Tide / Current Tables for Kahului, Kahului Harbor, Hawaii (2)
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Kahului
Click for Map
Mon -- 04:42 AM HST     1.69 feet High Tide
Mon -- 06:06 AM HST     Sunrise
Mon -- 09:32 AM HST     Moonset
Mon -- 10:24 AM HST     0.76 feet Low Tide
Mon -- 04:32 PM HST     2.05 feet High Tide
Mon -- 06:52 PM HST     Sunset
Mon -- 09:48 PM HST     Moonrise
Mon -- 11:27 PM HST     0.56 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.91.21.51.61.71.61.41.10.90.80.811.21.61.9221.91.61.310.70.6

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii (2) (expired 1999-12-31)
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Kahului
Click for Map
Mon -- 04:28 AM HST     1.72 feet High Tide
Mon -- 06:06 AM HST     Sunrise
Mon -- 09:32 AM HST     Moonset
Mon -- 10:17 AM HST     0.56 feet Low Tide
Mon -- 04:49 PM HST     2.21 feet High Tide
Mon -- 06:52 PM HST     Sunset
Mon -- 09:48 PM HST     Moonrise
Mon -- 11:20 PM HST     0.63 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.811.31.61.71.71.51.310.70.60.60.81.21.61.92.12.22.11.81.41.10.80.6

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 (9,2,3,4)
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Ground Weather Radar Station Kohala, HI
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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.