Thursday, April26, 2018 L-36.com


Marine Weather and Tides
Hilo, HI

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 5:53AMSunset 6:43PM Wednesday April 25, 2018 7:59 PM HST (05:59 UTC) Moonrise 3:07PMMoonset 3:08AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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- 332 Pm Hst Wed Apr 25 2018
Tonight..East winds 15 knots. Wind waves 6 feet. North swell 4 feet. Scattered showers.
Thursday..East winds 15 knots. Wind waves 6 feet. Northwest swell 3 feet. Scattered showers.
Thursday night..East winds 15 knots. Wind waves 5 feet. Northwest swell 4 feet. Scattered showers.
Friday..Southeast winds 15 knots. Wind waves 5 feet. Northwest swell 5 feet. Scattered showers.
Friday night..South winds 15 knots. Wind waves 4 feet. Northwest swell 5 feet. Scattered showers.
Saturday..Southwest winds 10 knots veering north in the afternoon. Wind waves 4 feet. Northwest swell 5 feet. Showers likely.
Saturday night..North winds 15 knots. Wind waves 4 feet. Northwest swell 7 feet. Showers likely.
Sunday..North winds 10 knots becoming variable less than 10 knots. Wind waves 3 feet. North swell 8 to 10 feet. Showers likely.
Monday..Winds variable less than 10 knots becoming north 10 knots. Wind waves 3 feet. North swell 7 to 9 feet. Showers likely.
PHZ100 332 Pm Hst Wed Apr 25 2018
Synopsis for hawaiian coastal waters.. Strong high pressure far northeast of the area will weaken through Thursday. A low will rapidly develop north of the islands on Friday, and linger through the weekend. A front associated with the low will move down the island chain Friday through Saturday, with the front stalling near the big island Sunday and Monday.

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 260143
afdhfo
area forecast discussion
national weather service honolulu hi
343 pm hst Wed apr 25 2018

Synopsis
High pressure far north-northeast of the state will start to
weaken overnight, leading towards a weakening of the trade wind
flow before winds shift out of the southeast tomorrow ahead of an
approaching cold front. This front will bring increased shower
activity to the islands, with showers reaching kauai Thursday
night and Friday, before moving down the island chain Friday
night through Sunday morning. Showers may linger into the new work
week over the big island.

Discussion
The forecast is on track for the short term with trades continuing
this evening with showers focused over windward and mauka areas.

The high is expected to begin to weaken overnight which will
result in weaker winds over the islands.

As the high moves to the east, a low develops north of the islands
with a front approaching the islands from the northwest. The
models show a trough developing near kauai just ahead of the
front.

This system will bring an increased chance of showers to the
state, but a lot of details with the system are still being
flushed out. Precipitable water (pw) values normally are near 1.2
inches this time of year, with 500 mb temperatures around -9
celsius. An associated upper level low forms to the northwest of
the surface low, however the coldest upper level temperatures are
not expected to move over the islands until late in the weekend,
which could be an issue mainly for the big island on Sunday. At
this time, the front will be its weakest as it nears kauai. The
main focus for rain on kauai will be Thursday night through
Friday, as the front taps into showery clouds currently upstream
of the islands. These clouds are currently riding in towards the
islands on the trade wind flow, but as winds shift, this moisture
will likely edge northward, but likely not far enough northward to
miss kauai.

As the front moves towards oahu Friday night, it starts pulling in
moisture from the south of the islands, with pw values reaching
near 1.5 inches over the islands from oahu to the big island.

Despite upper level temperatures remaining near normal, this
amount of moisture will increase showers, and heavier downpours
and localized flooding can't be ruled out. Part of the uncertainty
resides in the fact that the last couple model runs have been
shifting the focus of the rain to the east. Will continue to
monitor the situation with future runs.

The increased moisture lingers over the big island into Sunday,
meaning the big island could see the longest period of increased
shower activity through this event. There are some indicators with
the most recent model runs that the moisture will linger into
Monday and Tuesday near the big island, when colder upper level
temperatures are possible.

As mentioned above, many details on this situation are still being
worked out. Areas that remain saturated from recent rains should
closely monitor forecast updates.

Early next week, we are expecting a return to more typical trade
wind weather over the smaller islands, with some enhancement as
moisture from this frontal band will get caught up in the trade
wind flow.

Aviation
Fresh to locally strong trade winds will gradually ease through
Thursday as high pressure north-northeast of the state weakens. A
mid-level ridge will maintain stable conditions and an inversion
around 7,000 to 8,000 ft into tonight. Airmet tango for leeward
low-level turbulence will remain in place into tonight, and as
trades weaken and the mid-level ridge erodes on Thursday, the
airmet will be taken down.

Vfr conditions will prevail over leeward areas, with isolated
MVFR ceilings over some windward slopes. A pocket of moisture
currently about 125 miles east of the state will move in tonight
and may produce another round of mountain obscuration along
windward slopes that could last into Thursday.

Marine
A 1034 mb surface high far to the nne will move E and gradually
weaken over the next two days as a low rapidly develops about
1000 miles N of the islands. Fresh to locally strong trade winds
will weaken Thursday, then collapse completely Thursday night as a
weak trough develops over the area. A small craft advisory (sca)
currently posted for the windier marine zones around maui and the
big island will likely be allowed to expire Thursday morning as
the high weakens and trade winds begin to diminish.

A front associated with the developing low is expected to reach
kauai sometime Friday, then move down the chain through Saturday
before potentially stalling near the big island through the rest
of the weekend. Initially, right behind the front, N winds may
briefly reach SCA criteria in some of the marine zones. The low
will send a mix of swells and seas toward the islands this weekend
into next week, with associated seas rising above 10 feet in most
zones, necessitating a SCA from late Saturday into Monday.

A moderate long-period nnw swell is expected to arrive tomorrow
and peak Friday, with peak surf heights below advisory levels. The
low that develops N of the islands late in the week will remain
in place until early next week. The amount of swell surf that
arrives in the islands is somewhat uncertain, and will depend on
the evolution of the low and associated fetch. Current indications
are that a fairly significant (but poorly organized) swell will
produce advisory-level surf along exposed N and W facing shores,
with the peak of the swell around Sunday.

Elsewhere, several pulses of relatively small SW to S swell are
expected over the next week or so, with a peak in swell energy
around Sunday. Rough and choppy surf along E facing shores will
diminish Thursday and Friday. The oahu surf discussion (srdhfo) contains
further details on the sources of the swells.

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

Discussion... M ballard
aviation... Wroe
marine... Birchard


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi48 min NNE 5.1 G 6 75°F 76°F1017.9 hPa
51206 7 mi33 min 78°F7 ft
KWHH1 45 mi42 min WSW 5.1 G 6 78°F 80°F1016.2 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi67 minNNE 310.00 miPartly Cloudy76°F66°F72%1018 hPa

Wind History from HTO (wind in knots)
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Last 24hrE7NE8NE3NE3SW3W4SW3CalmW7CalmS5W5NW5N7N8N6E7
G15
NE8NE8NE10NE9NE5NE3Calm
1 day agoE3CalmSW4W4SW5CalmSW6SW3SW7W10CalmW5W7W5SW64E11E9E12E13E10E7E7NE7
2 days agoW6W3SW5S3W4SW4CalmW3SW4SW6SW4W3N5N6NE11NE10NE4NE5NE6E11N6W8W5NW4

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Thu -- 12:44 AM HST     2.17 feet High Tide
Thu -- 03:51 AM HST     Moonset
Thu -- 05:54 AM HST     Sunrise
Thu -- 07:15 AM HST     -0.13 feet Low Tide
Thu -- 01:28 PM HST     1.88 feet High Tide
Thu -- 04:03 PM HST     Moonrise
Thu -- 06:41 PM HST     Sunset
Thu -- 07:18 PM HST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.12.221.610.50.1-0.1-0.10.20.71.21.61.91.81.61.20.80.40.20.30.511.5

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 01:30 AM HST     1.91 feet High Tide
Thu -- 03:54 AM HST     Moonset
Thu -- 05:56 AM HST     Sunrise
Thu -- 08:04 AM HST     -0.06 feet Low Tide
Thu -- 02:25 PM HST     1.73 feet High Tide
Thu -- 04:06 PM HST     Moonrise
Thu -- 06:45 PM HST     Sunset
Thu -- 08:17 PM HST     0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.91.91.71.30.80.40.1-0.100.30.71.21.51.71.71.51.20.80.50.30.40.60.9

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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Wind Forecast for (1,6,7,8)
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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.