Friday, August23, 2019 L-36.com


Marine Weather and Tides
Poipu, 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 6:11AMSunset 6:57PM Friday August 23, 2019 3:15 AM HST (13:15 UTC) Moonrise 12:00AMMoonset 1:12PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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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PHZ113 Kauai Channel- 939 Pm Hst Thu Aug 22 2019
Rest of tonight..Northeast winds 15 knots. Wind waves 5 feet. SWell northwest 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds 15 knots. Wind waves 4 feet. SWell northwest 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 15 knots. Wind waves 4 feet. SWell northwest 3 feet. Isolated showers through the night.
Saturday..East winds 20 knots. Wind waves 5 feet. Isolated showers through the day.
Saturday night..East winds 20 knots. Wind waves 5 feet. Isolated showers through the night.
Sunday..East winds 20 knots. Wind waves 6 feet. Isolated showers.
Sunday night..East winds 15 knots. Wind waves 6 feet. Isolated showers.
Monday..Northeast winds 15 knots. Wind waves 5 feet. Isolated showers.
Tuesday..East winds 10 knots. Wind waves 4 to 5 feet. Southwest swell 3 feet. Isolated showers.
PHZ100 939 Pm Hst Thu Aug 22 2019
Synopsis for hawaiian coastal waters.. High pressure north of the state will maintain moderate to locally strong trade winds through at least Friday, then possibly decrease Friday night as a trough nears the state. High pressure will restrengthen northeast of the area over the weekend.


7 Day Forecast for Marine Location Near Poipu, HI
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location: 21.88, -159.46     debug


Area Discussion for -
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Fxhw60 phfo 230616
afdhfo
area forecast discussion
national weather service honolulu hi
816 pm hst Thu aug 22 2019

Synopsis
Trade winds will weaken late tonight through early Friday, then
return to the moderate to breezy range Friday night through the
weekend. Clouds and showers will favor windward and mountain
locations, especially through the overnight and early morning
periods as pockets of higher moisture move through. The exception
will be over the leeward areas of the big island, where afternoon
and evening clouds and showers form in response to the local sea
breeze. Warm and humid conditions will become a possibility Tuesday
through Wednesday as the trades trend down into the light and
variable range.

Discussion
The latest surface analysis showed a weakness within the subtropical
ridge due to an upper low and surface trough north to northeast of
the islands. Despite this weakness, breezy trades are holding over
the state. Clouds and showers are focusing over the typical windward
locations. Rainfall accumulations, however, have remained light
across the state over the past six hours (through 7 pm hst), except
for the leeward coast of the big island from kailua-kona to
honaunau, where heavy showers and a thunderstorm formed and
produced up to 2.19 inches within a three-hour period.

The short-term guidance remains in good agreement and depicts the
trades trending down briefly late tonight through early Friday as
the aforementioned upper low and surface trough pass to the north
from east to west. An upward trend in windward shower coverage can't
be ruled over kauai tonight into Friday as the moisture axis
associated with the trough moves through (pws near two inches).

Elsewhere, mostly dry conditions will prevail with clouds and
showers favoring windward and mountain locations.

Moderate to breezy trades will hold over the weekend as the upper
low and surface trough continue westward and high pressure builds to
the north. An increase in shower coverage will be possible late
Saturday into Sunday as a pocket of higher moisture moves through
from east to west. Although most of the shower coverage will focus
over windward and mountain locations, some will manage to spill
over into leeward locations with the gusty trades expected. Model
pws within this pocket of higher moisture are forecast to climb
into the 1.75 to 1.9 inch range over the big island late Saturday,
then to the smaller islands Saturday night into Sunday.

For the extended period, guidance remains in decent agreement
through the first half of next week and shows a weakness
developing within the ridge to the north as a broad upper trough
and surface front pass to the north. The pressure gradient is
forecast to respond and weaken over the state, which could be
enough for a land and sea breeze regime to become established
Tuesday through midweek. If this scenario evolves, clouds and
showers will favor interior areas through the afternoon and
evening periods.

Aviation
A high pressure ridge north of the state will keep moderate trade
winds in the forecast. MostlyVFR conditions are expected over all
islands with isolated MVFR conditions in showers possible along
east slopes of all islands.

Airmet tango remains in effect overnight for moderate turbulence
south through west of mountain ranges. Decreasing wind speeds on
Friday will allow this airmet to drop in the morning hours.

Marine
High pressure to the north will maintain moderate to locally
strong trades through Saturday. A trough over the northern
offshore waters may briefly decrease the wind speeds tonight into
Friday morning, but confidence remains low. Thus, the small craft
advisory (sca) remains in effect through Friday for the typically
windy waters around maui and the big island. The small craft
advisory will likely need to be extended later on Friday. A new
high building northeast of the islands will then strengthen winds
to fresh to strong levels late in the weekend. The small craft
advisory may need to be expanded into other zones depending on the
strength of the high over the weekend.

The current south swell will be on its way out on Friday with
mainly background energy expected over the weekend into early next
week. A larger southwest swell may arrive Tuesday and remain
through the week.

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

Breezy trades will continue to produce small choppy surf along
east facing shores over the next few days. An increase in wind
swell is expected late in the weekend as trades strengthen locally
and upstream of the state.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Friday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Gibbs
aviation... Bohlin
marine... Kino


Weather Reporting Stations
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Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi22 minENE 810.00 miA Few Clouds81°F73°F77%1014.1 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI21 mi19 minE 310.00 miFair78°F71°F79%1013.5 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrE17NE11----N10N10N14NE16N13N17----N13--------------NE8--NE8NE8
1 day ago----NE11NE12E13NE13NE15--NE12NE13NE13NE15NE14NE14----NE15----------N10NE14
2 days agoNE12E12NE11NE12E11E11NE13E12----NE12NE11NE12----NE14------------NE13NE11

Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
Click for Map
Fri -- 02:41 AM HST     0.30 feet Low Tide
Fri -- 04:58 AM HST     Last Quarter
Fri -- 06:18 AM HST     Sunrise
Fri -- 10:16 AM HST     1.46 feet High Tide
Fri -- 01:12 PM HST     Moonset
Fri -- 05:48 PM HST     0.70 feet Low Tide
Fri -- 07:02 PM HST     Sunset
Fri -- 09:03 PM HST     0.79 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.40.30.30.40.50.811.21.41.51.41.31.210.90.80.70.70.70.80.80.80.7

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Fri -- 02:38 AM HST     0.36 feet Low Tide
Fri -- 04:58 AM HST     Last Quarter
Fri -- 06:17 AM HST     Sunrise
Fri -- 10:25 AM HST     1.62 feet High Tide
Fri -- 01:11 PM HST     Moonset
Fri -- 05:45 PM HST     0.82 feet Low Tide
Fri -- 07:02 PM HST     Sunset
Fri -- 09:12 PM HST     0.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.40.40.40.60.81.11.31.51.61.61.51.41.210.90.80.80.80.80.80.80.8

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