Thursday, March21, 2019 L-36.com


Marine Weather and Tides
Poipu, HI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:33AMSunset 6:44PM Thursday March 21, 2019 5:31 AM HST (15:31 UTC) Moonrise 7:57PMMoonset 7:27AM Illumination 100% Phase: Full Moon; Moon at 15 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- 328 Am Hst Thu Mar 21 2019
Today..Northeast winds 15 knots. Wind waves 4 feet. Northwest swell 8 feet. Isolated showers.
Tonight..East winds 15 knots. Wind waves 5 feet. Northwest swell 8 feet. Isolated showers.
Friday..East winds 15 knots. Wind waves 6 feet. Northwest swell 8 feet. Isolated showers.
Friday night..Northeast winds 15 knots. Wind waves 6 feet. North swell 8 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..Northeast winds 15 knots. Wind waves 6 feet. North swell 7 feet. Showers likely in the morning, then scattered showers in the afternoon.
Saturday night..Northeast winds 15 knots. Wind waves 9 feet. North swell 6 feet. Scattered showers.
Sunday..Northeast winds 15 knots. Wind waves 8 feet. North swell 5 to 6 feet. Scattered showers.
Monday..Northeast winds 15 knots. Wind waves 7 feet. North swell 5 feet. Isolated showers.
PHZ100 328 Am Hst Thu Mar 21 2019
Synopsis for hawaiian coastal waters.. High pressure will build north of the area today through Saturday, then strengthen Saturday night through Sunday.


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 211332
afdhfo
area forecast discussion
national weather service honolulu hi
332 am hst Thu mar 21 2019

Synopsis
Trade winds will increase today and Friday as a cold front
approaches from the northwest. Though forecast to stall just north
of the islands, this front will be close enough to usher in
increased clouds and showers across the area Saturday and Sunday.

Discussion
A dry and stable airmass remains over the area, with overnight
soundings showing less than an inch of pw, positive lifted index
values and a strong inversion base between 5000 and 6000 feet. The
subtropical ridge lies across the islands this morning and the
slack pressure gradient keeps winds quite light. The pressure
gradient should steepen over the next day or so as a cold front
approaches from the northwest, which will increase trade wind
speeds. The front will continue to move towards the islands
through the end of the week, and then dissipate and or move to the
east of the islands.

Models show the front will stall just north of the islands, but
will be close enough to bring increased moisture, along with
stronger winds, a fair distance ahead of it. Moisture will
continue to increase as the front comes closest to the islands
Saturday and Sunday. With winds expected to remain out of a trade
wind direction, rainfall will focus over windward and mauka areas.

However, leeward areas will get wet as well from time to time.

Models show high pressure will approach from the northwest on
Monday, then move north of the islands Monday night and Tuesday.

This will maintain trade wind flow and, with leftover frontal
moisture across the region, we expect a wet trade wind pattern to
last from Tuesday through the rest of the forecast period.

Aviation
Clouds along with trade wind showers have increased over all but
molokai, as of 3 am hst. Trade winds will continue to strengthen
as it become deeper in the next 12 to 18 hours. This comes about
as the surface high, supplying the trades, moves east, passing some
600 nm north of the islands tonight. Strengthening trades will
usher in a more typical trade pattern with the uptick in the
frequency of the showers during the evening, then showers becoming
less by mid morning or by 22 utc. These trade showers will favor
the windward and mountain areas of all of the larger islands,
briefly lowering to MVFR conditions. A shower or two, will sneak
down wind into the lee areas of the smaller islands. A shower or
two may also pop up over the lee side of the big island during the
afternoon and evening hours. No airmet sierra is expected at this
time, however, the strengthening trades to locally strong, may
warrant airmet tango later today.

Marine
Trades will steadily fill in across the state today as a ridge of
high pressure noses eastward in the wake of a front passing far to
the north. Trades will reach the moderate to fresh category early
today, then potentially the fresh to strong category tonight
through the weekend as high pressure sets up to the north.

Strongest winds are expected over the typical windier channel
waters and areas around maui county and the big island. Seas are
holding just below advisory levels this morning, but could climb
toward the 10 ft threshold (small craft advisory level) by Friday
due to a combination of a north to northwest swell and increasing
wind waves as the trades pick up. Trades should begin to weaken
next Tuesday through the midweek time frame as the ridge shifts
south toward the area and another front passes to the north.

Surf along north and west facing shores is expected to hold around
advisory levels through early Saturday due to the active pattern
over the northern pacific this week, then steadily ease late
Saturday through Monday.

The new long-period northwest swell that filled in through the
day Wednesday has peaked and is slowly trending down. This
downward trend will be short-lived due to a subtle reinforcement
expected later today, which should be enough to keep the surf up
around advisory levels into tonight along north and west facing
shores.

As this source eases Friday, a new long-period north-northwest
swell will fill in, which will support advisory-level surf
continuing along north facing shores late Friday into Saturday
before dropping below by Saturday afternoon. Heights along west
facing shores will likely drop below advisory levels by Friday
night due to the more northerly angle of the reinforcement.

Although the surf will remain below advisory levels late Saturday
through Sunday, a smaller reinforcement out of the northwest will
continue to deliver solid surf for north and west facing shores
Sunday.

For next week, a small moderate period north swell expected
Monday night will keep the surf up for locations that favor this
direction through the day Tuesday. A moderate long-period
northwest swell will become a possibility Wednesday through
Thursday, that could generate near advisory level surf by
Thursday.

Surf along east facing shores will remain small through the day,
then rise Friday through the weekend as fresh to strong trades
return. A downward trend will be possible by the midweek time
frame of next week as the trades weaken.

Surf along south facing shores will remain small each day with
mainly background long period southerly pulses and short-period
southeast energy expected.

Hfo watches warnings advisories
High surf advisory until 6 am hst Friday for niihau-kauai
windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley-windward
haleakala.

Discussion... Powell
aviation... Lau
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 8 mi49 min WSW 6 G 8 64°F 76°F1018.6 hPa
51208 29 mi55 min 74°F7 ft
51201 - Waimea Bay, HI (106) 73 mi49 min 72°F7 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI9 mi38 minNW 510.00 miA Few Clouds67°F61°F81%1018.5 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI21 mi35 minNNE 810.00 miMostly Cloudy71°F61°F71%1018.1 hPa

Wind History from HLI (wind in knots)
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Last 24hrW7W8W4N7NE7NE15NE15NE11NE12NE11NE9N11N6NE9NE5NW5NW6W5W6NW6W6NW4W6NW5
1 day agoNE10E8NE9E12E11NE9NE85E6SE7E6SE6SE6SE4CalmW4W6W7W7W6W6W6W7W7
2 days agoN7W5NW5NE12NE14NE12NE12N13NE12NE13NE12NE13NE13NE12NE13NE13NE13NE14NE13NE12NE12NE11NE10E10

Tide / Current Tables for Port Allen, Hanapepe Bay, Kauai Island, Hawaii
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Port Allen
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Thu -- 03:46 AM HST     1.50 feet High Tide
Thu -- 06:41 AM HST     Sunrise
Thu -- 07:26 AM HST     Moonset
Thu -- 10:23 AM HST     -0.19 feet Low Tide
Thu -- 04:21 PM HST     1.31 feet High Tide
Thu -- 06:49 PM HST     Sunset
Thu -- 07:57 PM HST     Moonrise
Thu -- 10:36 PM HST     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.81.21.41.51.41.10.70.3-0-0.2-0.20.10.40.81.11.31.31.10.80.50.200

Tide / Current Tables for Nawiliwili, Hawaii (2)
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Nawiliwili
Click for Map
Thu -- 03:55 AM HST     1.66 feet High Tide
Thu -- 06:40 AM HST     Sunrise
Thu -- 07:25 AM HST     Moonset
Thu -- 10:20 AM HST     -0.23 feet Low Tide
Thu -- 04:30 PM HST     1.45 feet High Tide
Thu -- 06:48 PM HST     Sunset
Thu -- 07:56 PM HST     Moonrise
Thu -- 10:33 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.91.31.61.71.51.20.80.3-0-0.2-0.20.10.40.91.21.41.41.20.90.50.200

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.
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Wind Forecast for (11,2,3,4)
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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.