Friday, October18, 2019 L-36.com


Marine Weather and Tides
Hilo, HI

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:14AMSunset 5:56PM Friday October 18, 2019 1:49 PM HST (23:49 UTC) Moonrise 9:50PMMoonset 10:31AM Illumination 72% Phase: Waning Gibbous; Moon at 20 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- 932 Am Hst Fri Oct 18 2019
Rest of today..East winds 20 knots. Wind waves 4 feet. Northwest swell 3 feet and north 3 feet. Isolated showers.
Tonight..East winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet. SWell north 3 feet. Isolated showers.
Saturday..East winds 20 knots. Wind waves 5 feet. Northwest swell 3 feet. Isolated showers.
Saturday night..East winds 20 knots. Wind waves 6 feet. Northwest swell 3 feet. Isolated showers.
Sunday..East winds 20 knots. Wind waves 5 feet. Isolated showers.
Sunday night..East winds 20 knots. Wind waves 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Monday..East winds 20 knots. Wind waves 5 feet. Scattered showers.
Tuesday..East winds 20 knots. Wind waves 5 feet. Scattered showers.
PHZ100 932 Am Hst Fri Oct 18 2019
Synopsis for hawaiian coastal waters.. Ridge of high pressure will weaken over the weekend as a front passes far to the north.


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 181945
afdhfo
area forecast discussion
national weather service honolulu hi
945 am hst Fri oct 18 2019

Synopsis
Trade winds will continue over the islands through the weekend and
into next week, periodically delivering clouds and showers to
windward areas, although fewer showers are expected this weekend.

Discussion
To summarize, trade winds will prevail over the islands through the
next week, albeit with some variations in speed, and some subtle
variations in direction. The somewhat showery weather pattern of the
last couple of days should trend a little drier over the weekend as
a low aloft continues to distance itself from the islands.

To elaborate, high pressure to the distant northeast of the islands
will drift east the next couple of days, move little for a couple of
days, and then drift toward the north in about 5 to 7 days from now.

This will place the islands on the southwest periphery of the high's
circulation, meaning that the prevailing moderate to locally breezy
easterly trade winds will be occasionally weakened and somewhat
veered to the east-southeast, especially on the western end of the
island chain. This effect will be most pronounced when a front
passes north of the islands Sunday Monday, and potentially again
toward the end of next week.

Water vapor imagery shows a broad trough aloft to the northwest of
the islands, with early morning soundings showing an elevated
subsidence inversion based between 8 and 10 thousand feet. Radar
shows quite a few showers soaking windward areas, falling from open-
celled showery cumulus. A trend toward fewer trade showers is
expected over the weekend as the low aloft drifts away, a mid-level
ridge builds nearby, and incoming pwat diminishes slightly. An
increase in trade winds early next week may bring a subtle increase
in windward shower coverage, but significant changes are not
expected as moderate trades prevail. Long range guidance indicates
the potential for much lighter winds in about a week, as the high
weakens and a trough low develops north of the islands.

Aviation
Moderate to locally breezy trade wind flow will persist through
Saturday. Ragged clouds and scattered light showers will focus
mainly across windward areas, with some increase in coverage
overnight. Afternoon sea breezes across leeward big island will be
weak, but sufficient for some cumulus development and a few showers
possible late this afternoon and early evening.

No airmets are in effect or anticipated at this time. Brief MVFR
ceilings and visibilities are possible in showers. Otherwise,VFR
conditions will prevail all areas.

Marine
High pressure northeast of the state will maintain the fresh to
strong easterly trade winds through tomorrow afternoon. The small
craft advisory (sca) continues through tomorrow afternoon for the
typical windier waters near maui county and the big island.

As a front moves closer to the state from the north late Saturday
night, winds are expected to shift to the east-southeast,
particularly over the southern end of the state. The front is
expected to stay north of the islands, and will likely weaken the
winds over the western islands. Expecting winds to shift back to a
more easterly direction Monday.

Surf is expected to remain below advisory levels through the
forecast period. A combination of a west-northwest and north swell
will hold surf along north facing shores. The north swell is
expected to fade later today. A new small long-period swell expected
Saturday will help maintain the surf along exposed shores.

A gale low is expected to develop near the kurils Saturday night
into Sunday, and then track to the east toward the date line Sunday
into Monday. This would generate a northwest swell that could reach
the islands late next week.

A recent storm-force low far southeast of new zealand could bring a
long-period south swell that would peak over the weekend, and then
fade into early next week.

The fresh to locally strong trade winds will maintain rough surf
along east facing shores through tomorrow. As the winds weaken
Sunday, expect some improvements.

Hfo watches warnings advisories
Small craft advisory until 6 pm hst Saturday for maalaea bay-
pailolo channel-alenuihaha channel-big island leeward waters-big
island southeast waters.

Discussion... Birchard
aviation... Ts
marine... M ballard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi49 min NE 5.1 G 7 80°F 83°F1016.7 hPa (-2.5)
51206 7 mi33 min 83°F7 ft
KWHH1 45 mi55 min W 9.9 G 11 82°F 84°F1015.4 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 mi56 minNNE 810.00 miFair86°F68°F55%1017 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSE8E10E9E6E4CalmSW3SW5SW5S6SW6SW7W6SW4SW4SW7SW7SW6W8SE6SE11W45N7
1 day agoNE5E64E7E4CalmW7S5W6SW5S3W4W4SW3CalmSW3SW4SW4SW3Calm5SE6E7E9
2 days agoNE9N8NE11NE8N5N7N53CalmSW7W5CalmSE4W6SW7E8E6W7SW5W3CalmNE6NE11
G18
SW5

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
Fri -- 06:19 AM HST     Sunrise
Fri -- 07:00 AM HST     2.12 feet High Tide
Fri -- 10:34 AM HST     Moonset
Fri -- 02:13 PM HST     0.47 feet Low Tide
Fri -- 05:57 PM HST     Sunset
Fri -- 06:40 PM HST     0.84 feet High Tide
Fri -- 09:52 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.20.50.91.41.822.121.81.51.10.80.60.50.50.60.70.80.80.80.60.40.3

Weather Map
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wmap_P
GEOS 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.
Link to Loop

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