Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Maalaea, 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 6:05AMSunset 6:53PM Tuesday August 20, 2019 2:42 PM HST (00:42 UTC) Moonrise 10:23PMMoonset 10:21AM Illumination 71% Phase: Waning Gibbous; Moon at 20 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- 925 Am Hst Tue Aug 20 2019
.small craft advisory in effect from this evening through Thursday afternoon...
Rest of today..North winds 20 knots. Wind waves 3 feet. South swell 3 feet. Isolated showers in the afternoon.
Tonight..North winds to 25 knots. Wind waves 4 feet. South swell 3 feet. Isolated showers.
Wednesday..North winds to 25 knots. Wind waves 4 feet. South swell 3 feet.
Wednesday night..North winds to 25 knots. Wind waves 4 feet. South swell 3 feet.
Thursday..North winds to 25 knots. Wind waves 4 feet. South swell 4 feet.
Thursday night..North winds 20 knots. Wind waves 2 feet or less.
Friday..North winds 20 knots. Wind waves 2 feet or less.
Saturday..North winds to 25 knots. Wind waves 3 feet.
PHZ100 925 Am Hst Tue Aug 20 2019
Synopsis for hawaiian coastal waters.. A trade wind weather pattern can be expected over the next several days thanks to high pressure north of the area.


7 Day Forecast for Marine Location Near Maalaea, HI
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location: 20.78, -156.47     debug


Area Discussion for -
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Fxhw60 phfo 202010
afdhfo
area forecast discussion
national weather service honolulu hi
1010 am hst Tue aug 20 2019

Synopsis
A surface ridge will remain north of the area. A weak trough south
of the big island will move west and weaken through this evening.

A front north of the islands will move south through Thursday,
then move away to the west. High pressure will build north of the
area over the weekend.

Discussion
The 8 am surface analysis shows a surface ridge extending from a
high far northeast of the area near 31n130w and another high about
600 miles northwest of the area near 30n163w. A weak trough south
of the big island is moving west around 10 miles an hour and
weakening.

The ridge north of the islands will maintain easterly trade winds
across the area. A poorly organized area of showery low clouds
associated with the trough south of the big island has been moving
over the islands. Most of the showers have moved off to the west
of the islands, but some showers remain upstream of the big island
and kauai. These showers will clear the islands this afternoon.

Trade winds will strengthen a bit through tomorrow as the high
builds northwest of the islands. A front about 1000 miles north of
the islands will move south through Thursday and cause the trades
to weaken. On Friday, the front will move off to the west and the
high will build northeast. Trade winds will strengthen again and
become locally breezy over the weekend.

Aviation
An elongated surface high to the north of the state will help to
maintain moderate easterly trade flow through this afternoon.

Isolated showers, mainly concentrated along windward areas and
over elevated terrain, will become scattered after sundown this
evening. Expect MVFR conditions at times tonight from low clouds
and shra.

No airmets are currently in effect.

Marine
High pressure will strengthen north of the area providing an
uptick in trade winds speeds. Small craft advisory conditions are
expected beginning tonight over the windy waters around maui
county and the big island.

Data from the pacioos buoys show a new long period south swell
continues to build. Surf along south facing shores will continue
to rise today with heights expected to reach high surf advisory
levels. This swell will hold solid through Wednesday then lower
gradually Thursday and Friday. A series of smaller long period
southerly swells are expected early next week.

A small west to northwest swell will linger over the next few
days providing some out of season surf along exposed shorelines.

Strengthening trade winds over the next several days will cause
short period choppy surf to increase along east facing shores
through the remainder of the week and on through the weekend.

Hfo watches warnings advisories
High surf advisory from midnight tonight to 6 am Thursday for
south facing shores of all islands.

Small craft advisory from 6 pm this evening to 6 pm Thursday for
maalaea bay, the pailolo and alenuihaha channels and waters south
of the big island.

Discussion... Donaldson
aviation... Thomas
marine... Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 8 mi60 min NNE 15 G 19 81°F 1014.8 hPa
51213 28 mi42 min 85°F4 ft
51202 - Mokapu Point, HI (098) 78 mi42 min 82°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kahului, Kahului Airport, HI9 mi1.8 hrsNE 23 G 2710.00 miPartly Cloudy and Windy91°F70°F50%1015 hPa
Lahaina - West Maui, HI19 mi1.9 hrsNE 16 G 2515.00 miPartly Cloudy90°F68°F49%1015.2 hPa

Link to 5 minute data for PHOG

Wind History from HOG (wind in knots)
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Last 24hrN17NE16----------NE8NE11NE10NE9NE12NE12--NE10NE7NE10NE11
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1 day agoNE17NE17NE14--NE16--NE10----E3CalmNE7N5NE8--N5NE7NE11NE15
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2 days agoNE17
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--NE6NE10E4E7--S3CalmCalmSE3N10NE16NE18NE19NE23NE21NE22

Tide / Current Tables for Kihei, Maui (Hawaii) (2)
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Kihei
Click for Map
Tue -- 12:46 AM HST     0.36 feet Low Tide
Tue -- 06:06 AM HST     Sunrise
Tue -- 07:26 AM HST     1.65 feet High Tide
Tue -- 10:21 AM HST     Moonset
Tue -- 12:39 PM HST     0.71 feet Low Tide
Tue -- 06:51 PM HST     Sunset
Tue -- 06:55 PM HST     1.76 feet High Tide
Tue -- 10:23 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.40.50.711.31.51.61.61.51.20.90.80.70.811.31.51.71.81.71.41.10.8

Tide / Current Tables for Kahului, Kahului Harbor, Hawaii
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Kahului
Click for Map
Tue -- 05:03 AM HST     1.64 feet High Tide
Tue -- 06:06 AM HST     Sunrise
Tue -- 10:21 AM HST     Moonset
Tue -- 10:37 AM HST     0.77 feet Low Tide
Tue -- 04:56 PM HST     2.00 feet High Tide
Tue -- 06:51 PM HST     Sunset
Tue -- 10:23 PM HST     Moonrise
Tue -- 11:40 PM HST     0.55 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.81.11.41.61.61.61.41.20.90.80.80.91.11.41.71.921.91.71.410.80.6

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 (20,4,5,8)
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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.