Tuesday, April24, 2018 L-36.com


Marine Weather and Tides
Captain Cook, 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 6:42PM Tuesday April 24, 2018 2:47 PM HST (00:47 UTC) Moonrise 2:13PMMoonset 2:25AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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- 941 Am Hst Tue Apr 24 2018
.small craft advisory in effect through early Wednesday morning...
Rest of today..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. Northwest swell 3 feet. Haze. Scattered showers.
Tonight..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. Northwest swell 3 feet. Haze. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 8 feet. Haze. Isolated showers.
Wednesday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 8 feet. Haze. Isolated showers.
Thursday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 7 feet. Haze. Isolated showers.
Thursday night..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 6 feet. Northwest swell 3 feet after midnight. Haze. Isolated showers.
Friday..West of the big island, winds variable less than 10 knots. NEar south point, east winds 15 knots becoming variable less than 10 knots. Wind waves 4 to 5 feet. Northwest swell 3 feet. Haze. Scattered showers.
Saturday..Winds variable less than 10 knots becoming northeast 10 knots after midnight. Wind waves 4 to 5 feet. Northwest swell 3 to 4 feet. Haze. Occasional showers.
PHZ100 941 Am Hst Tue Apr 24 2018
Synopsis for hawaiian coastal waters.. Strong high pressure far north of the area will produce fresh to locally strong trade winds through Wednesday. Winds will decrease Thursday and Friday as the high weakens. A front is forecast to move across the area from W to E over the weekend.

7 Day Forecast for Marine Location Near Captain Cook, HI
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location: 19.46, -155.96     debug


Area Discussion for -
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Fxhw60 phfo 242013
afdhfo
area forecast discussion
national weather service honolulu hi
1013 am hst Tue apr 24 2018

Synopsis
Strong high pressure northeast of the state will maintain breezy
trades and a stable regime of mainly windward and mauka rainfall
through tonight. Trades will gradually weaken on Wednesday and
Thursday, then shift out of the southeast on Friday ahead of a
front. The front will affect the western end of the state on
Friday then move to the eastern end of the island chain on
Saturday, likely bringing wet and unsettled weather to portions
of the state.

Discussion
A somewhat typical spring trade wind pattern is in place. A 1034
mb surface high located 1,300 miles north-northeast of the state
is maintaining a breezy and gusty trade wind flow. Ridging aloft
is producing stable conditions, as overnight soundings and recent
aircraft data show an inversion between 4,500 and 6,000 ft.

Precipitable water (pw) ranges between 0.9 to 1.1 inches on the
soundings, which is just below april normal, and random pockets
of moisture observed in the trade wind flow contain pw values
slightly above april normal. One such area of moisture is
affecting windward areas from the big island to oahu this morning,
bringing up to a half inch of rainfall to the wettest windward
slopes in the last three hours and less than one tenth of an inch
to most windward areas during this time.

Only minor changes are expected during the next couple of days.

The breezy trades will hold through tonight then gradually decline
Wednesday and Thursday as the surface high to the northeast
weakens. The mid level ridge will weaken but remain strong enough
to maintain somewhat stable conditions, with the inversion slowly
weakening and rising as an upper level trough moves in from the
northwest. The current pocket of moisture in the trade wind flow
should clear the state by evening, and the GFS and ECMWF are
showing another area of low level moisture moving in on Thursday
along with increasing high clouds.

A marked shift in the weather pattern will begin Thursday night as
a deep low forms roughly 800 miles north of the state and
generates a cold front about 250 miles north and northwest of
kauai. Trades will rapidly decrease and shift out of the southeast
as the front develops and advances toward the islands. The GFS and
ecmwf show the area of low level moisture lingering along windward
areas, and although the atmosphere does not appear to be
destabilizing rapidly, we will have to watch out for the potential
of heavy showers, mainly over the western half of the island
chain.

The front will likely affect the western half of the state on
Friday and Friday night. The GFS and ECMWF depict this feature as
somewhat poorly defined initially, then merging with a surface
trough forming in the pocket of low level moisture pooled near
the islands. The supporting upper level low will likely be closest
to the state late Friday, and the GFS and ECMWF depict the
islands near the entrance region of a forming jet stream aloft.

This points to the potential for localized heavy rainfall along
the eastward-moving front, and given ongoing model differences,
the greatest probability for this rainfall looks to be from kauai
to molokai during this time.

Uncertainty increases heading into the weekend, though there is
high potential for wet and unsettled weather over portions of the
state. The GFS and ECMWF have yet to show a consistent depiction
of the front during this time, though the latest runs suggest that
the feature will stall near the big island late Saturday. Pw
values in excess of 1.75 inches are expected along the stalled
front as deep southeasterly flow draws up deep moisture from the
tropics, and flooding rainfall is possible for most likely the
eastern half of the state. To the west of the front, a drier and
more stable northerly flow will fill in. And while uncertainty in
the frontal position remains, kauai and oahu have the greatest
chance of experiencing drier conditions as early as Saturday.

Aviation
Fresh to strong trade winds will carry in an area of low clouds
and showers to the islands today. The clouds and showers will
focus along windward and mountain areas from the big island to
oahu, with some showers tracking to leeward sides of the smaller
islands at times. Brief mountain obscurations will be likely
across windward areas today, with airmet sierra for tempo mountain
obscurations likely.

Airmet tango is in effect through today over and west of the
mountains on all islands due to the strong trade winds.

Marine
A small craft advisory is currently posted through tonight for
all hawaiian coastal waters due to strong high pressure far north
of the area. Winds are expected to decrease a bit Wednesday and
Thursday as the high weakens.

The current small northwest swell will continue to lower today
through Wednesday. The first in a series of north northwest swells
is expected to arrive on Thursday, peak on Friday, then lower
gradually on Saturday. A rather strong low pressure system is
forecast to develop north of the area this weekend. Surf heights
later this weekend and on into early next week will be highly
dependent on the location of the low center and the fetch
orientation aimed at the islands. Current guidance suggests
advisory level surf from this low but confidence in surf heights
remains rather low since much will depend on the strength of the
low and the fetch orientation.

Easterly trade winds will continue to produce short period choppy
surf along east facing shores through Thursday with a downward
trend expected later in the week and on through the weekend.

Small, mainly background south swells are expected through
Saturday with a slightly larger south swell expected Sunday and
Monday.

Hfo watches warnings advisories
Small craft advisory until 6 am hst Wednesday for all hawaiian
waters.

Discussion... Wroe
aviation... Wroe
marine... Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 40 mi47 min W 6 G 7 78°F 79°F1016.1 hPa (-0.7)
ILOH1 - 1617760 - Hilo, HI 51 mi47 min ENE 7 G 13 78°F 77°F1017.5 hPa (-1.9)

Wind History for Kawaihae, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI13 mi54 minWSW 910.00 miMostly Cloudy82°F66°F60%1016 hPa

Wind History from HKO (wind in knots)
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Last 24hrSW4SW5SW9S11S7S7SE12SE6E3E4E6SE5S4S4CalmE7N5N44SW7SW8SW4SW5W9
1 day agoSW9S8S6S8NE11
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2 days agoS9S8S10S8S6S5CalmCalmSE3CalmNE7N6E3E8E6E7SE6S6SW6W7W8W9W9W9

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 02:25 AM HST     Moonset
Tue -- 05:59 AM HST     Sunrise
Tue -- 06:32 AM HST     -0.03 feet Low Tide
Tue -- 12:30 PM HST     1.04 feet High Tide
Tue -- 02:13 PM HST     Moonrise
Tue -- 05:47 PM HST     0.32 feet Low Tide
Tue -- 06:44 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.61.30.90.50.2-0-00.10.40.70.9110.90.70.50.40.30.40.711.41.7

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Tue -- 02:25 AM HST     Moonset
Tue -- 05:59 AM HST     Sunrise
Tue -- 06:47 AM HST     0.13 feet Low Tide
Tue -- 12:29 PM HST     1.01 feet High Tide
Tue -- 02:13 PM HST     Moonrise
Tue -- 05:57 PM HST     0.18 feet Low Tide
Tue -- 06:44 PM HST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.61.410.70.40.20.10.20.40.70.9110.90.70.40.20.20.30.50.81.21.5

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 (20,4,5,8)
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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.