Monday, March18, 2019 L-36.com


Marine Weather and Tides
Hilo, 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 3:30 PM HST (01:30 UTC) Moonrise 4:29PMMoonset 4:45AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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- 933 Am Hst Mon Mar 18 2019
.small craft advisory in effect through early Tuesday morning...
Rest of today..Northeast winds 15 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 933 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 Hilo, HI
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location: 19.72, -155.08     debug


Area Discussion for -
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Fxhw60 phfo 181939
afdhfo
area forecast discussion
national weather service honolulu hi
939 am hst Mon mar 18 2019

Synopsis
High pressure north of the islands will continue to bring trade
winds to the islands through the week. A dry trade wind pattern
with cooler temperatures will continue into Tuesday, with an
uptick in showers during the middle of the week. Winds are
expected to increase again at the end of the week as a front again
approaches from the northwest.

Discussion
High pressure to the north-northwest of the islands continues to
move to the east. Strong trade wind inversions were noted on the
overnight soundings around 7000 feet with a dry airmass over the
islands. As a result, few showers are being carried in on the
trade wind flow. Temperatures are still on the cooler side behind
the front that passed through the islands yesterday.

The high will be moving to the east, which will turn winds to a
more easterly direction. Satellite derived precipitable water (pw)
shows a dry airmass extending a ways upstream of the islands, so
expecting few showers into the middle of the week.

Heading into the second half of the week, another cold front will
be approaching the islands from the northwest. The front will
continue to push the high eastward, with lighter winds in store
for Wednesday, before they increase again ahead of the approaching
front.

There is some model disagreement with the ECMWF washing out the
front just north of kauai, with the GFS bringing at least some of
the front to the northern islands before washing it out over the
central islands. Both models show an uptick in shower activity,
but also preserve a trade wind flow. Will be monitoring future
model runs.

Aviation
A surface high north of the area will maintain northeast trade
winds over the main hawaiian islands today. The winds will veer
out of the east tomorrow as the high moves east. A ridge aloft to
the southwest of the area will keep the atmosphere stable. The low
level winds will carry stable, broken low clouds over northeast
sections of the islands with scattered clouds over southwest
sections. The high, interior areas of the big island of hawaii and
maui will remain clear. There may be isolated MVFR ceilings over
northeast sections, butVFR conditions will prevail.

No airmets are in effect and none are expected through Tuesday.

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 of 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... M ballard
aviation... Donaldson
marine... Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi31 min NNE 5.1 G 12 73°F 76°F1015.9 hPa (-2.0)
51206 7 mi45 min 76°F14 ft
KWHH1 45 mi31 min WNW 13 G 15 1014.1 hPa (-2.6)

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 mi38 minNNE 1210.00 miFair77°F55°F48%1016.4 hPa

Wind History from HTO (wind in knots)
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Last 24hrN15
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N13N15N12N7N7N7N6N9NW9NW9NW9NW8NW7W6NW5W4N5NE8NE10NE9NE10N10N12
1 day agoNE5NE4E6E4NE3CalmW4CalmW3SW4SW5SW6W5SW4SW6SW6W45N16
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2 days agoNE8NE7NE6N3CalmN3CalmSW33SE4CalmW6SW7SW6SW6SW5SW7CalmE4E6NE8NE8NE8NE8

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (21,6,7,8)
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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.