Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Makena, 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 6:52PM Wednesday August 21, 2019 2:29 PM HST (00:29 UTC) Moonrise 11:01PMMoonset 11:12AM Illumination 62% Phase: Waning Gibbous; Moon at 21 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- 928 Am Hst Wed Aug 21 2019
.small craft advisory in effect through Thursday afternoon...
Today..North winds to 25 knots. Wind waves 3 feet. South swell 3 feet.
Tonight..North winds to 25 knots. Wind waves 3 feet. South swell 3 feet.
Thursday..North winds to 25 knots. Wind waves 3 feet. South swell 3 feet.
Thursday night..North winds 15 knots. Wind waves 3 feet in the evening then 2 feet or less.
Friday..North winds 10 knots. Wind waves 2 feet or less. Isolated showers.
Friday night..North winds 20 knots. Wind waves 2 feet or less.
Saturday..North winds to 25 knots. Wind waves 3 feet. Isolated showers.
Sunday..North winds to 25 knots. Wind waves 3 feet.
PHZ100 928 Am Hst Wed Aug 21 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will keep moderate to locally strong trade winds in place through the weekend.


7 Day Forecast for Marine Location Near Makena, HI
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location: 20.6, -156.6     debug


Area Discussion for -
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Fxhw60 phfo 211939
afdhfo
area forecast discussion
national weather service honolulu hi
939 am hst Wed aug 21 2019

Synopsis
A high pressure ridge north of the hawaiian islands will keep
moderate to breezy trade winds in the forecast today. A shallow
surface front approaching the state from the north will weaken the
trade winds on Thursday and Friday. Expect increasing trade winds
through the weekend. Limited shower activity will favor typical
windward and mauka areas through Sunday.

Discussion
A high pressure ridge north of the islands will keep moderate to
breezy trade winds in the forecast today. A weak low level trough
passing south of kauai this morning will cause elevated moisture
levels to decrease today across the western islands. A strong
upper level ridge will keep the trade wind inversion heights in
the 5000 to 7000 foot range for the next several days. At these
inversion heights only isolated to scattered showers are possible
favoring the typical windward and mauka areas in the overnight to
early morning hours.

Trade winds will decrease on Thursday and Friday as a shallow cold
front approaches the islands from the north. The weakening frontal
boundary will stall just north of kauai with little impact on
precipitation pattern over the islands. Trade winds however will
weaken on Thursday and Friday, as this trough is positioned
between the surface ridge and the islands weakening the surface
pressure gradient. Easterly winds will push this frontal boundary
westward on Saturday and Sunday and trade wind speeds will
increase through the weekend as high pressure builds in north of
the state.

Weather conditions for next week, another weak low level trough
will pass through the state from east to west from Monday into
Tuesday. Expect a slight increase in shower activity over the big
island and maui on Monday afternoon, then spreading westward to
the smaller islands from Monday night into Tuesday afternoon.

Leeward areas will see some isolated showers with this system with
higher coverage along the windward and mauka slopes. Trade winds
will remain moderate to locally breezy on Monday, however lighter
trade winds return from Tuesday onward as another cold front
moving in from the north breaks down the ridge north of the state.

Aviation
Vfr conditions prevail at all the TAF sites and these conditions
are expected to continue through the day and on into the evening
hours. There may be some brief MVFR conditions over windward sites
such as phto and phli mainly in passing shra. Otherwise mainly
vfr conditions will prevail across the area with some brief MVFR
conditions occurring over windward and mauka areas as moisture
embedded in the trades interacts with island terrain.

Airmet tango is posted for low level turbulence over and
immediately south through west of mountain ranges below 6000
feet. These conditions are expected to continue through the
evening hours.

Marine
High pressure to the northwest will keep moderate to locally
strong trade winds in place. A small craft advisory (sca) remains
in effect for the typically windy waters around maui and the big
island through Thursday. A front dropping southward and closer to
the island chain late in the week will ease the trade winds
Thursday night through Friday night. A new high building
northeast of the islands will then strengthen the trades back to
moderate and locally strong levels over the weekend, with scas
likely being required once again for the windier marine zones.

The current long-period south swell will hold steady today, then
gradually lower tonight and into the weekend. A high surf
advisory remains in effect for south facing shores of all islands
through 6 am Thursday. A series of small long-period south and
southwest swells will move through Sunday through early next week.

A larger southwest swell is possible Tuesday through the middle
of next week.

Small northwest swells will linger over the next few days
providing some out of season surf along north facing shores.

Trade winds will bring short period choppy surf to east facing
shores.

Hfo watches warnings advisories
High surf advisory until 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.

Small craft advisory until 6 pm hst Thursday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Bohlin
aviation... Burke
marine... Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KLIH1 - 1615680 - Kahului Bay, Maui, HI 22 mi66 min N 12 G 15 81°F 1017.2 hPa
51213 24 mi90 min 85°F5 ft
51202 - Mokapu Point, HI (098) 80 mi90 min 82°F5 ft

Wind History for Kahului, Kahului Harbor, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lanai City, Lanai Airport, HI22 mi94 minNE 2010.00 miOvercast and Breezy83°F72°F70%1016.3 hPa
Kahului, Kahului Airport, HI23 mi96 minNNE 2110.00 miPartly Cloudy and Breezy88°F72°F59%1017.4 hPa

Link to 5 minute data for PHNY

Wind History from HNY (wind in knots)
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NE12E6NE9NE9NE14NE18NE15N15
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1 day agoW7NE16--NE18
G23
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NE11NE10NE11E7NE10E10E7NE5NE8E10NE11E10
G17
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--CalmNE9N8
2 days ago5NE14NE15NE14NE16NE14NE9NE8NE11NE13NE10NE8NE13NE10NE8
G16
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G19
--S3N6N8N4

Tide / Current Tables for Kuheia Bay, Kahoolawe Island, Hawaii
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Kuheia Bay
Click for Map
Wed -- 01:31 AM HST     0.36 feet Low Tide
Wed -- 06:07 AM HST     Sunrise
Wed -- 08:20 AM HST     1.63 feet High Tide
Wed -- 11:11 AM HST     Moonset
Wed -- 02:09 PM HST     0.85 feet Low Tide
Wed -- 06:51 PM HST     Sunset
Wed -- 07:23 PM HST     1.47 feet High Tide
Wed -- 11:00 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.40.50.811.31.51.61.61.51.31.10.90.80.911.21.41.51.41.31.10.9

Tide / Current Tables for Smuggler Cove, Kahoolawe Island, Hawaii
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Smuggler Cove
Click for Map
Wed -- 01:42 AM HST     0.36 feet Low Tide
Wed -- 06:07 AM HST     Sunrise
Wed -- 08:14 AM HST     1.63 feet High Tide
Wed -- 11:12 AM HST     Moonset
Wed -- 02:21 PM HST     0.85 feet Low Tide
Wed -- 06:51 PM HST     Sunset
Wed -- 07:17 PM HST     1.47 feet High Tide
Wed -- 11:01 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.40.50.711.31.51.61.61.51.31.10.90.90.911.21.41.51.41.31.10.9

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.