Monday, March18, 2019 L-36.com


Marine Weather and Tides
Wainaku, 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 6:24AMSunset 6:31PM Monday March 18, 2019 6:19 AM HST (16:19 UTC) Moonrise 4:29PMMoonset 4:45AM Illumination 94% Phase: Waxing Gibbous; Moon at 12 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- 331 Am Hst Mon Mar 18 2019
.small craft advisory in effect through early Tuesday morning...
Today..Northeast winds 20 knots. Wind waves 5 feet. Northwest swell 16 feet decreasing to 14 feet in the afternoon.
Tonight..Northeast winds 15 knots. Wind waves 5 feet. Northwest swell 13 feet decreasing to 11 feet after midnight.
Tuesday..East winds 15 knots. Wind waves 4 feet. Northwest swell 9 feet. Isolated showers.
Tuesday night..East winds 15 knots. Wind waves 4 feet. Northwest swell 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Wednesday..East winds 15 knots. Wind waves 4 feet. Northwest swell 7 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Wednesday night..East winds 10 knots. Wind waves 4 feet. Northwest swell 9 feet. Isolated showers.
Thursday..Northeast winds 15 knots. Wind waves 5 feet. Northwest swell 9 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 to 6 feet. North swell 9 feet. Scattered showers.
PHZ100 331 Am Hst Mon Mar 18 2019
Synopsis for hawaiian coastal waters.. High pressure will build north of the area through Tuesday. The associated ridge will shift south over the area by Wednesday as another front passes to the north. High pressure will then again build north of the state late this week.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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Fxhw60 phfo 181338
afdhfo
area forecast discussion
national weather service honolulu hi
338 am hst Mon mar 18 2019

Synopsis
Trade winds will continue to blow across the islands along with
slightly cooler temperatures lasting through Tuesday. Warmer
temperatures will return on Wednesday with light winds as another
cold front approaches hawaii from the northwest, briefly
weakening the high pressure ridge north of the state. Breezy trade
winds are forecast on Thursday and strong trade winds develop on
Friday as a high pressure system builds in north of the hawaiian
islands. Another shallow cold front moves into the northwestern
islands of kauai and oahu from Friday night into Saturday morning
with increasing clouds and showers over both islands. Clouds and
showers along the frontal band will then spread southeastward
down the rest of the island chain.

Discussion
Satellite imagery this morning shows an extensive stratocumulus
cloud bank north of the state. Most of these clouds will decrease
in coverage after sunrise due to atmospheric heating and mixing.

The shallow cold front has drifted east of the big island. Large
scale atmospheric subsidence will keep stable conditions in the
forecast with only isolated showers possible along windward
mountain areas through Tuesday.

A surface high will migrate eastward over the next few days
passing just north of the island chain with moderate northeast trade
winds forecast through Tuesday. As the high moves into the east
pacific another shallow cold front will approach the islands from
the north.

On Wednesday, a broad trough associated with a cold front moving
into the central pacific will weaken the high pressure ridge north
of the state. These weaker pressure gradients will produce light
and variable winds with some onshore sea breezes developing over
the western islands. The atmosphere will remain fairly stable
through the middle of the week as strong downward atmospheric
motions (subsidence) will keep cloud heights capped at around 6000
feet resulting in a dry weather pattern through Friday afternoon.

Long range weather models continue to show a high pressure ridge
building into the region by the end of the week. Increasing trade
winds will drive a shallow cold front into the northwestern half
of the state from Friday night into Saturday morning. Expect
increasing clouds and some showers over kauai and oahu during this
time period. Clouds and elevated showers along the frontal band
will then spread southeastward to maui county on Saturday, and the
big island on Sunday morning. The american (gfs) model cross sections
are showing deeper cloud heights, as compared to the previous
frontal system, with cloud tops rising up to the 10,000 to 12,000
foot level. These deeper cloud heights will allow more collision
of cloud droplets within the cloud layer, thereby increasing
rainfall chances across the state. Strong trade winds will help
lift clouds over windward mountain ranges, enhancing rainfall
chances along north and east sections of all islands. Some of the
stronger shower bands will likely bring at least scattered
rainfall into leeward areas with the passage of this cold front.

Model solutions differ a bit on the movement of this frontal band,
expect some timing changes as the Friday to Saturday forecast
period gets closer. We increased precipitation chances for the
Friday through Sunday time period to account for the next cold
frontal passage. A blended approach was used between the american
(gfs) model and the european (ecmwf) models with additional
weighting towards the GFS solution. Breezy to strong trades will
continue through the weekend into the first half of next week as a
1030 mb surface high lingers north of the hawaiian islands.

Aviation
In the wake of a passing shallow cold front, winds have veered
northeasterly at around 10-15 kt. These winds will continue to
veer east northeasterly this morning and into this afternoon.

Limited shallow moisture will leave the area mostly dry with the
exception of isol -shra along the windward coasts and slopes.

No airmets are in effect and none are expected during the period.

Marine
Fresh to strong north-northeast winds associated with high
pressure building to the north will shift out of the east tonight
into Tuesday. A brief period with light and variable winds will
become a possibility through the midweek time frame as the ridge
shifts south over the area due to a passing front to the north. A
return of fresh to strong trade winds will be possible Thursday
into next weekend as high pressure builds north of the area in the
wake of the passing front.

Surf along north and west facing shores will hold above warning
levels today, then drop to advisory levels Tuesday as the large
north-northwest swell gradually eases. For more details regarding
the potential impacts associated with the large surf see the
latest high surf warning that remains in effect until 6 pm hst
today.

The active pattern across the northern pacific will continue
through the week with overlapping long-period northwest swells
expected Wednesday, Friday, and Saturday night. These
reinforcements will be similar in size, which will keep the surf
around advisory levels for north and west facing shores each day.

The northwest swell Wednesday and Wednesday night will be the
largest of the three, which could drive the surf toward warning
levels around its peak.

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 warning 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-big island north and east.

High surf advisory until 6 pm hst this evening for kona.

Small craft advisory until 6 am hst Tuesday for all hawaiian
waters-
discussion... Bohlin
aviation... Jt
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi32 min WNW 7 G 8 70°F 75°F1016.4 hPa
51206 6 mi34 min 76°F11 ft
KWHH1 46 mi38 min E 1 G 1.9 69°F 77°F1015.7 hPa

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, HI1 mi27 minW 610.00 miOvercast68°F57°F68%1016.9 hPa

Wind History from HTO (wind in knots)
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Last 24hrSW6W45N16
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1 day agoSW5SW7CalmE4E6NE8NE8NE8NE8NE5NE4E6E4NE3CalmW4CalmW3SW4SW5SW6W5SW4SW6
2 days agoW6SW5CalmN6N7NE10NE11NE8NE7NE8NE7NE6N3CalmN3CalmSW33SE4CalmW6SW7SW6SW6

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
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Mon -- 01:15 AM HST     2.61 feet High Tide
Mon -- 04:44 AM HST     Moonset
Mon -- 06:26 AM HST     Sunrise
Mon -- 08:13 AM HST     -0.00 feet Low Tide
Mon -- 01:38 PM HST     1.53 feet High Tide
Mon -- 04:29 PM HST     Moonrise
Mon -- 06:30 PM HST     Sunset
Mon -- 07:17 PM HST     -0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.42.62.52.21.71.10.60.200.10.40.81.21.51.51.310.50.2-000.30.81.4

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Mon -- 02:22 AM HST     2.44 feet High Tide
Mon -- 04:48 AM HST     Moonset
Mon -- 06:29 AM HST     Sunrise
Mon -- 09:11 AM HST     -0.01 feet Low Tide
Mon -- 02:45 PM HST     1.32 feet High Tide
Mon -- 04:32 PM HST     Moonrise
Mon -- 06:33 PM HST     Sunset
Mon -- 08:23 PM HST     -0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.22.42.42.11.61.10.50.2-00.10.30.711.31.31.20.90.50.1-0.1-00.20.7

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 (12,3,4,5)
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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.