Saturday, March23, 2019 L-36.com


Marine Weather and Tides
Leilani Estates, 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 6:20AMSunset 6:33PM Saturday March 23, 2019 6:41 AM HST (16:41 UTC) Moonrise 9:37PMMoonset 8:36AM Illumination 92% Phase: Waning Gibbous; Moon at 17 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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PHZ122 Big Island Windward Waters- 318 Am Hst Sat Mar 23 2019
.small craft advisory in effect through late this afternoon...
Today..East winds 15 knots. Wind waves 5 feet. North swell 8 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 6 feet. North swell 7 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 6 feet. North swell 6 feet. Isolated showers through the day.
Sunday night..East winds 15 knots. Wind waves 6 feet. North swell 6 feet. Scattered showers.
Monday..East winds 15 knots. Wind waves 5 feet. Northwest swell 6 feet. Scattered showers.
Monday night..Northeast winds 15 knots. Wind waves 5 feet. North swell 5 feet. Scattered showers.
Tuesday..East winds 15 knots. Wind waves 4 to 5 feet. North swell 4 to 5 feet. Scattered showers.
Wednesday..Southeast winds 10 knots veering south after midnight. Wind waves 4 feet. Northwest swell 4 to 6 feet. Isolated showers.
PHZ100 318 Am Hst Sat Mar 23 2019
Synopsis for hawaiian coastal waters.. High pressure will build north of the state through Sunday, then shift east and weaken Monday through Tuesday as a front approaches.


7 Day Forecast for Marine Location Near Leilani Estates, HI
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location: 19.4, -154.93     debug


Area Discussion for -
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Fxhw60 phfo 231340
afdhfo
area forecast discussion
national weather service honolulu hi
340 am hst Sat mar 23 2019

Synopsis
Breezy trade winds will continue through the rest of the weekend
as the surface ridge of high pressure stays north of the islands.

The remnants of a dissipating front may provide a boost in trade
showers Monday and Tuesday. A front may usher in some unsettled
weather to the islands the latter half of next week.

Discussion
The combination of fragments from the nearby frontal band and the
standard trade showers, resulted in the influx of trade showers now
affecting kauai and oahu. Trade showers are also affecting the
remaining islands but not as frequent as kauai and oahu. Windward
kauai has been rather damp, with kilohana picking up almost 3
quarters of an inch in a 3 hour period ending at 2 am hst. Oahu
has seen lighter amounts, under a tenth of an inch at many windward
locations. Even daniel k. Inouye airport picked up a trace in the
past couple of hours. The frequency of these showers will be
trending less for all but kauai as the morning progresses. Kauai
will continue to be influenced by the close proximity of the
stalled frontal boundary through at least tonight.

This boundary will start falling apart later tonight and Sunday
upwind of the islands. The trades will then pick them up and bring
them over the islands between Monday afternoon and Tuesday morning.

Although the windward and mountain areas will take in most of the
showers, a few of them will be drifting into the lee areas of the
smaller islands. Isolated showers are possible for the kona
slopes interior areas each afternoon, then shift to the coastline
after sunset.

The 2 am hst soundings from lih and ito, still show a strong low
level inversion based at around 7k feet. The GFS maintain this
profile through tonight, followed by a slight rise to 9k feet on
Sunday, then to 10 to 12k feet on Monday, which will support the
remnants of the boundary passing through the islands.

The trade winds have strengthen slightly during the past 12 to 24
hours. The source of the trades is from 1027 mb high located 1100
miles northwest of kauai. This high will be strengthening to 1031
mb while moving eastward through tonight and Sunday. The high
takes a southeast motion thereafter and gradually weaken through
Monday night. In response, we start losing the trades on Tuesday,
while a front approaches the islands from the northwest. The winds
will become light and variable on Wednesday as the front closes
in on the islands. The models, ECMWF and gfs, are in fair
agreement thus far with the front reaching kauai around sunrise
Thursday morning. The two models differ thereafter, with the ec
stalling the front near kauai and the GFS stalling it over the
eastern part of the island chain early Friday morning. This
signals a change of weather with more to come.

Aviation
High pressure north of the state will keep moderate trade winds
in place today and tonight, with low clouds and showers favoring
windward slopes and coasts. Some MVFR conditions can be expected
as showers move through, with kauai and oahu the most likely
targets, particularly through mid morning. PredominantlyVFR
conditions are expected across the island chain late this morning
and this afternoon, although some brief MVFR CIGS will remain
possible, particularly across kauai. Trade showers will likely
increase again tonight, mainly in windward areas.

Airmet sierra remains in effect for mountain obscuration across
windward sections of kauai and oahu. This airmet will likely
remain in place through mid morning.

Marine
Trade winds will shift out of a more easterly direction and
strengthen into the fresh to strong category today through Monday
as high pressure builds north of the state. A combination of the
trades and a new north-northwest swell has led to seas climbing
above the small craft advisory threshold (10 ft) overnight, which
is above predicted levels by a couple of feet early this morning.

Seas will hold at these levels through today, then gradually
lower through the second half of the weekend into Monday as this
north-northwest swell eases. Trades should begin to weaken next
Tuesday through the midweek time frame as the ridge shifts south
toward the area and another front approaches. Guidance continues
to indicate light and variable winds by Wednesday followed by a
quick shift out of the north Thursday as the boundary makes it
into the area.

Surf along north and west facing shores will hold around advisory
levels today due to the current north-northwest swell, then
steadily ease tonight through Monday. A small reinforcement out
of a more northerly direction is expected Monday night through
Tuesday. Overlapping long-period northwest swells will fill in
through the day Wednesday and hold into the second half of the
week. Surf should remain below advisory levels Sunday through
Wednesday for north and west facing shores and potentially reach
advisory levels Thursday.

Surf along east facing shores will rise Sunday due to fresh to
strong trades. A downward trend is expected Monday through
Wednesday 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 pm hst this afternoon for niihau-
kauai windward-kauai leeward-waianae coast-oahu north shore-oahu
koolau-molokai-maui windward west-maui central valley- windward
haleakala.

Small craft advisory until 6 pm hst Sunday for all hawaiian
waters except leeward waters of oahu and maui counties.

H lau jelsema gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 24 mi41 min SSW 1.9 G 4.1 67°F 76°F1019 hPa (+0.5)
51206 26 mi55 min 75°F10 ft

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI23 mi48 minWSW 510.00 miPartly Cloudy65°F61°F87%1019.4 hPa

Wind History from HTO (wind in knots)
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Last 24hrCalmS6W9W6CalmCalmNE10E10
G16
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1 day agoW8W8NE3N7N10NE8N10Calm--NW7NE7NE4N4CalmW5SW4SW4W5S3SW6W5SW6W3SW3
2 days agoSW5S3SW56E4E6E8NE4E5W6NW6W4W3CalmSW5SW5W5SW6SW6SW6W7SW6S6SW7

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
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Sat -- 04:34 AM HST     1.77 feet High Tide
Sat -- 06:21 AM HST     Sunrise
Sat -- 08:36 AM HST     Moonset
Sat -- 10:48 AM HST     -0.05 feet Low Tide
Sat -- 05:29 PM HST     2.17 feet High Tide
Sat -- 06:32 PM HST     Sunset
Sat -- 09:37 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.71.11.51.71.71.51.20.70.30-0.10.10.511.51.92.12.11.91.61.10.70.4

Tide / Current Tables for Hilo, Hilo Bay, Hawaii
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Hilo
Click for Map
Sat -- 04:34 AM HST     2.08 feet High Tide
Sat -- 06:21 AM HST     Sunrise
Sat -- 08:36 AM HST     Moonset
Sat -- 10:50 AM HST     -0.26 feet Low Tide
Sat -- 05:25 PM HST     2.33 feet High Tide
Sat -- 06:32 PM HST     Sunset
Sat -- 09:37 PM HST     Moonrise
Sat -- 11:33 PM HST     0.41 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.81.31.822.11.81.30.80.2-0.2-0.3-0.10.411.62.12.32.321.61.10.70.4

Weather Map and Satellite Images
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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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (12,3,4,5)
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Ground Weather Radar Station South Shore, 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.