Tuesday, March19, 2019 L-36.com


Marine Weather and Tides
Honaunau-Napoopoo, 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 6:23AMSunset 6:32PM Tuesday March 19, 2019 1:34 PM HST (23:34 UTC) Moonrise 5:37PMMoonset 5:39AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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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PHZ123 Big Island Leeward Waters- 951 Am Hst Tue Mar 19 2019
.small craft advisory in effect through late this afternoon...
Rest of today..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Northwest swell 7 feet and north 3 feet.
Tonight..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Northwest swell 5 feet and north 3 feet. Isolated showers.
Wednesday..West of the big island, winds variable less than 10 knots becoming northwest 10 knots in the afternoon. NEar south point, east winds 15 knots. Wind waves 5 feet. Northwest swell 5 feet and north 3 feet. Isolated showers.
Wednesday night..Winds variable less than 10 knots west of the big island...east 10 knots near south point. Wind waves 4 feet. Northwest swell 6 feet. SWell north 3 feet. Isolated showers in the evening.
Thursday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 5 feet. Northwest swell 6 feet.
Thursday night..West of the big island, winds variable less than 10 knots becoming southeast 10 knots after midnight. NEar south point, east winds 20 knots. Wind waves 8 feet. Northwest swell 6 feet. Isolated showers.
Friday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon, then becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 9 feet. Northwest swell 5 to 6 feet. Isolated showers.
Saturday..West of the big island, southwest winds 10 knots veering northwest in the afternoon, then becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 9 feet. North swell 4 to 5 feet. Isolated showers.
PHZ100 951 Am Hst Tue Mar 19 2019
Synopsis for hawaiian coastal waters.. Trade winds will ease today through Wednesday as a ridge of high pressure shifts southward toward the coastal waters. The trades will then begin to increase late Wednesday night and Thursday as high pressure builds northwest of the state, with moderate to strong trades returning Thursday through the weekend as high pressure strengthens to the north of the island chain.


7 Day Forecast for Marine Location Near Honaunau-Napoopoo, HI
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location: 19.5, -155.74     debug


Area Discussion for -
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Fxhw60 phfo 191948
afdhfo
area forecast discussion
national weather service honolulu hi
948 am hst Tue mar 19 2019

Synopsis
High pressure to the north of the islands with ridging aloft will
maintain a dry trade wind pattern today, with lighter winds
expected tomorrow. Trade winds will increase Thursday and Friday.

A cold front approaching from the northwest will bring increasing
clouds and showers to the islands Saturday and Sunday.

Discussion
No changes to the forecast this morning. High pressure to the
north of the islands, with ridging aloft, is maintaining a dry
trade wind pattern over the region. The high to the north will
continue to move to the east, and weaken tomorrow, which will
result in some weakening of the winds over the islands.

A cold front approaching from the northwest will be the main
feature to monitor through the end of the week. The front will be
moving closer to the islands Thursday, and will help to increase
the pressure gradient resulting in an uptick in our winds Thursday
and Friday. Yesterday it looked like the front would reach kauai
late Thursday night or Friday morning. Since then, the models have
slowed the front's forward progress, and are now suggesting that
the front wouldn't reach kauai until Saturday. None of the models
are showing an actual frontal passage through the state, but
rather have the front dissipating near kauai. That being said, the
models are bringing an increase in moisture to the islands which
will mean increased cloud and showers this weekend, primarily
being carried in on the trade wind flow.

Aviation
Surface high pressure to the northeast of hawaii will provide the
state with northeasterly-easterly trade winds. These winds will
slowly shift to the southeast as the day progresses as the high
moves to the east-northeast. The pressure gradient will also
slowly loosen through the day with the high moving away and a cold
front approaching the area from the northwest.

Little moisture in the air so mostlyVFR conditions across the
state. The exception may be for the windward slopes that may see
isolated, passing areas of MVFR conditions tonight into Wednesday.

No airmets are currently in effect or anticipated through this
period.

Marine
Moderate to fresh trades will continue today, then ease into the
light to locally moderate range tonight through Wednesday night as
a front passes by well to the north of the islands. A small craft
advisory (sca) remains in effect for most waters today due to
elevated seas associated with the current northwest swell, with
all marine zones expected to drop below SCA levels tonight as this
swell fades. A new northwest swell will build on Wednesday
however, and this will likely bring seas back up to SCA levels
across portions of the marine area exposed to this swell. The
trades will begin to re-strengthen Thursday as a new high builds
northwest of the state, reaching moderate to strong speeds Thursday
night through the weekend. The increasing trades in combination
with a series of overlapping northwest swells will likely require
scas for a good chunk of the marine area Thursday through the
weekend.

Surf along north and west facing shores continues to slowly
decline this morning, but the latest buoy observations and visual
observations continue to support advisory level surf along most
north and west facing shores. As a result, a high surf advisory
(hsa) is in effect through 6 pm today for most north and west
shores of the smaller islands. A brief period of below advisory
level surf is expected tonight through early Wednesday, but a new
large northwest swell will bring the return of advisory level surf
during the day Wednesday. A series of overlapping northwest
swells will keep surf elevated along north and west facing shores
through the remainder of the week and over the weekend, with surf
remaining near or at advisory levels Wednesday through Saturday.

Surf along east facing shores will remain small through midweek,
then rise Friday into the weekend as strong trades return locally
and upstream. Surf along south facing shores will remain small
through the week with mainly background southerly pulses moving
through.

Hfo watches warnings advisories
High surf advisory until 6 pm hst this evening 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 this evening for kauai
northwest waters-kauai windward waters-kauai leeward waters-
kauai channel-oahu windward waters-kaiwi channel-maui county
windward waters-alenuihaha channel-big island windward waters-
big island leeward waters-big island southeast waters.

Discussion... M ballard
aviation... Chevalier
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 37 mi35 min WNW 8.9 G 11 76°F 76°F1015.2 hPa (-2.0)
ILOH1 - 1617760 - Hilo, HI 40 mi35 min E 5.1 G 7 74°F 76°F1016.1 hPa (-2.0)
51206 45 mi49 min 76°F8 ft

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI17 mi42 minSW 910.00 miPartly Cloudy79°F60°F52%1015.3 hPa
Bradshaw Army Air Field / Hawaii, HI22 mi99 minWSW 510.00 miFair69°F39°F35%1014.8 hPa

Wind History from HKO (wind in knots)
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Last 24hrNW12NW14NW13NW14N11N16N11N9CalmNE6NE5NE3E5CalmN6NE4E4CalmE3W6W7W6SW8SW9
1 day agoNW17N17N21N19N21N14NE5N4N7N7NE6N3CalmE3NE3E5NE4NE4N4N9NE9
G17
NW13NW13NW12
2 days agoW9W8W7W8W6NW8N8N8N7NE6N6NE6NE6N4NE5NE7NE6NE6E6SE55N10NW16NW14

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Tue -- 02:46 AM HST     2.17 feet High Tide
Tue -- 05:38 AM HST     Moonset
Tue -- 06:28 AM HST     Sunrise
Tue -- 09:31 AM HST     -0.17 feet Low Tide
Tue -- 03:11 PM HST     1.32 feet High Tide
Tue -- 05:37 PM HST     Moonrise
Tue -- 06:34 PM HST     Sunset
Tue -- 08:59 PM HST     -0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.82.12.221.61.10.50.1-0.1-0.10.10.40.81.21.31.310.60.2-0.1-0.2-00.3

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 02:41 AM HST     2.19 feet High Tide
Tue -- 05:39 AM HST     Moonset
Tue -- 06:28 AM HST     Sunrise
Tue -- 09:23 AM HST     -0.14 feet Low Tide
Tue -- 03:05 PM HST     1.32 feet High Tide
Tue -- 05:37 PM HST     Moonrise
Tue -- 06:34 PM HST     Sunset
Tue -- 08:52 PM HST     -0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.82.12.221.610.50.1-0.1-0.10.10.50.91.21.31.210.60.2-0-0.100.4

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (19,4,5,8)
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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.