Monday, August19, 2019 L-36.com


Marine Weather and Tides
Manele, 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 6:10AMSunset 6:59PM Monday August 19, 2019 4:45 PM HST (02:45 UTC) Moonrise 9:53PMMoonset 9:37AM Illumination 80% 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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PHZ118 Maui County Leeward Waters- 338 Pm Hst Mon Aug 19 2019
Tonight..Northeast winds 15 knots. Wind waves 4 feet. South swell 3 feet. Isolated showers.
Tuesday..East winds 15 knots. Wind waves 4 feet. South swell 3 feet increasing to 5 feet in the afternoon. Isolated showers through the day.
Tuesday night..Northeast winds 15 knots. Wind waves 5 feet. South swell 5 feet. Isolated showers.
Wednesday..East winds 15 knots. Wind waves 4 feet. South swell 5 feet. Isolated showers in the morning.
Wednesday night..Northeast winds 15 knots. Wind waves 5 feet. South swell 4 feet. Isolated showers.
Thursday..Northeast winds 15 knots. Wind waves 4 feet. South swell 4 feet. Isolated showers in the morning.
Thursday night..Northeast winds 15 knots. Wind waves 4 feet. South swell 3 feet in the evening. Isolated showers.
Friday..East winds 10 knots rising to 15 knots. Wind waves 3 to 5 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 4 to 5 feet. Isolated showers.
PHZ100 338 Pm Hst Mon Aug 19 2019
Synopsis for hawaiian coastal waters.. 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 late Thursday into Friday.


7 Day Forecast for Marine Location Near Manele, HI
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location: 20.67, -157.6     debug


Area Discussion for -
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Fxhw60 phfo 200150
afdhfo
area forecast discussion
national weather service honolulu hi
350 pm hst Mon aug 19 2019

Synopsis
A building ridge north of the state will maintain a trade wind
pattern through the upcoming weekend. Showers will be focused over
windward and mountains areas in this flow. Light to moderate trade
winds will persist with periods of moderate to locally breezy
trades in the middle of the week and again for the weekend.

Discussion
No major changes to the forecast package with the afternoon
package. Have boosted pops in several areas tonight through
tomorrow night based satellite and satellite derived information.

Satellite derived precipitable water (pw) shows a slug of
moisture to the east and southeast of the big island. Pw values
exceed 1.5 inches, with pockets near 2.0 inches. The afternoon
sounding from lihue has 1.21 pw and hilo has 1.11 inches. As the
moisture seen on satellite moves to the west on the trade wind
flow, it will bring an uptick in shower activity to the islands.

The trades will focus those showers over windward and mauka areas.

A surface ridge north of the islands will maintain the trade wind
flow through the week. Expect an uptick in winds tomorrow and
Wednesday to moderate to locally breezy conditions. There could be
a small downward trend Thursday and Friday, but expecting more
widespread moderate to breezy conditions for the weekend. The
downward trend will be due in part to an old front northeast of
the islands that will help to disrupt the trade wind flow.

While the front is not expected to reach the islands, leftover
moisture is expected to reach the islands on the trade wind flow.

This could mean an uptick in shower activity at the end of the
week. The models continue to show the bulk of that moisture
staying north of kauai, but it will likely increase showers over
the windward sides of kauai and possibly oahu.

Beyond the weekend, the forecast continues to depict a trade wind
flow which is more in line with the ECMWF depiction, as there have
been several run to run differences in the gfs.

Aviation
An elongated surface high to the north of the state will act to
maintain weak to moderate east northeast trades this afternoon
through tonight. Thus, expect most shower activity to occur along
the windward side of the islands after Sun down. Brief MVFR
conditions may develop at times, mainly due to lowered visibility
and mountain obscuration from the low clouds and showers.

No airmets are currently in effect.

Marine
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 late Thursday through Friday.

Surf along south facing shores will continue to build tonight and
through the day Tuesday as the new large, long-period south-
southwest peaks Tuesday night. Long-period forerunners are
starting to register on the offshore buoys at NOAA buoy 51002 and
51004, with a spike in energy registered this afternoon. This
should lead to advisory level surf by later tonight. Thus a high
surf advisory (hsa) has been issued starting midnight tonight
along south facing shores of all hawaiian islands. As this swell
passed through the pacioos buoy at pago pago several days ago, it
registered swell heights and energy levels 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. 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.

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
High surf advisory from midnight tonight to 6 am hst Thursday
for niihau-kauai windward-kauai leeward-oahu south shore-waianae
coast-molokai leeward-lanai makai-kahoolawe-maui leeward west-
maui central valley-leeward haleakala-kona-south big island-big
island north and east.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51213 32 mi46 min 85°F3 ft
OOUH1 - 1612340 - Honolulu, HI 46 mi52 min ENE 9.9 G 18 84°F 82°F1013.2 hPa
51211 47 mi46 min 82°F3 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI35 mi1.8 hrsW 710.00 miOvercast79°F69°F72%1013.9 hPa

Link to 5 minute data for PHNY

Wind History from HNY (wind in knots)
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Last 24hrNE15NE14NE16NE14NE9NE8NE11NE13NE10NE8NE13NE10NE8
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NE12NE6E5E5NE7NE5NE7NE4NE5NE5E5W7SW6Calm4--5NE14
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Tide / Current Tables for Kaumalapau, Lanai Island, Hawaii
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Kaumalapau
Click for Map
Mon -- 12:42 AM HST     0.34 feet Low Tide
Mon -- 06:08 AM HST     Sunrise
Mon -- 06:37 AM HST     1.49 feet High Tide
Mon -- 09:34 AM HST     Moonset
Mon -- 12:08 PM HST     0.56 feet Low Tide
Mon -- 06:27 PM HST     1.85 feet High Tide
Mon -- 06:54 PM HST     Sunset
Mon -- 09:50 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.50.711.31.51.51.41.10.90.70.60.60.81.11.41.71.81.81.71.410.7

Tide / Current Tables for Kolo, Molokai Island, Hawaii
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Kolo
Click for Map
Mon -- 12:40 AM HST     0.34 feet Low Tide
Mon -- 06:08 AM HST     Sunrise
Mon -- 06:40 AM HST     1.29 feet High Tide
Mon -- 09:35 AM HST     Moonset
Mon -- 12:06 PM HST     0.56 feet Low Tide
Mon -- 06:30 PM HST     1.65 feet High Tide
Mon -- 06:55 PM HST     Sunset
Mon -- 09:51 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.50.70.91.11.31.31.210.80.60.60.60.811.31.51.61.61.51.20.90.7

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

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (22,6,7,8)
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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.