Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Wainaku, 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 5:56AMSunset 6:41PM Friday April 20, 2018 9:33 PM HST (07:33 UTC) Moonrise 10:09AMMoonset 11:42PM Illumination 34% Phase: Waxing Crescent; Moon at 6 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- 918 Pm Hst Fri Apr 20 2018
Rest of tonight..East winds 20 knots. Wind waves 5 feet. Northwest swell 4 feet. Scattered showers.
Saturday..East winds 20 knots. Wind waves 7 feet. Northwest swell 4 feet. Scattered showers.
Saturday night..East winds 20 knots. Wind waves 7 feet. Northwest swell 4 feet. Scattered showers.
Sunday..East winds 20 knots. Wind waves 6 feet. Northwest swell 4 feet. Scattered showers.
Sunday night..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 5 feet. Scattered showers.
Monday..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 6 feet. Scattered showers.
Monday night..East winds 20 knots. Wind waves 7 feet. Northwest swell 5 feet. Scattered showers.
Tuesday..East winds 20 knots. Wind waves 7 to 8 feet. Northwest swell 4 to 5 feet. Scattered showers.
Wednesday..East winds 20 knots. Wind waves 7 to 8 feet. Northwest swell 4 feet. Scattered showers.
PHZ100 918 Pm Hst Fri Apr 20 2018
Synopsis for hawaiian coastal waters.. A high far northeast of the islands will move east through the weekend. A new high will build north of the area early next 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 210632
afdhfo
area forecast discussion
national weather service honolulu hi
832 pm hst Fri apr 20 2018

Synopsis
Breezy trade wind weather is expected over the weekend with
clouds and showers focused over windward areas. Some of these
showers will blow over to leeward locations on the smaller
islands, while the kona side of the big island will see afternoon
clouds and showers. Trades will strengthen to locally windy
levels next week.

Discussion
High pressure far northeast of the main hawaiian islands is
driving locally strong trade winds across the state this evening.

Radar shows scant shower activity upwind of the islands, but
satellite loop shows layered clouds lingering across maui county
and the big island. Afternoon soundings showed pw in the 1.1 to
1.5 inch range with increasing stability.

Models show the high pressure to the north will keep trade winds
on the breezy side through the forecast period, gradually gaining
strength and spreading westward over the weekend and into next
week. Clouds and showers brought in by the trades will favor
windward and mauka areas, but leeward areas may get wet from time
to time as well as winds increase. The layered mid and upper level
clouds will continue moving eastward, clearing maui county
tonight and the big island Saturday morning. Drier and clearer
weather is then expected through the rest of the forecast period.

Aviation
A ridge of high pressure to the north of the state will keep a
moderate to breezy trade wind flow in place through Saturday.

Clouds and light showers will favor windward and mauka areas
through the period, with occasional MVFR CIGS vsbys expected.VFR
conditions will prevail in leeward areas.

Airmet sierra is in effect for mountain obscuration over windward
sections of kauai, oahu, molokai, maui and the big island.

Conditions will likely remain in place through much of the night.

Airmet tango remains in effect for moderate low level turbulence
over and downwind of the terrain of all islands. These conditions
are expected to continue through Saturday. Airmet tango also
remains in effect for moderate upper level turbulence between
fl250 and fl450. These conditions will likely continue through
most of the weekend.

Marine
A surface high north of the area will move northeast through
Saturday. The high is producing locally strong trade winds over
hawaiian waters. A small craft advisory (sca) continues for
strong trade winds in the windier areas near maui county and the
big island. A new high building northwest of the area will cause
the trade winds to strengthen further this weekend. The SCA will
likely be expanded starting Saturday.

Surf is expected to remain below high surf advisory (hsa) thresholds
along all shores through this weekend. Surf along east facing
shores will remain rough through Sunday night due to the trade
winds, but heights will remain moderate. There will be some
increase in surf heights along east facing shores next week as
trade winds strengthen.

A small northwest swell will build tonight and peak tomorrow. A
slightly larger swell is expected to arrive Sunday evening and
peak Monday. Another moderate swell is possible next Thursday.

Surf along south facing shores will remain small through early
next week. Lows in the southern hemisphere may strengthen and
shift east enough to produce some bigger surf along south facing
shores by the end of next week.

See the collaborative surf discussion for more information.

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

Discussion... Powell
aviation... Jelsema
marine... Donaldson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi51 min NE 8 G 11 77°F1019 hPa
51206 6 mi36 min 77°F6 ft
KWHH1 46 mi51 min WSW 6 G 6 79°F1016.5 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 mi40 minNE 410.00 miMostly Cloudy76°F68°F77%1019.5 hPa

Wind History from HTO (wind in knots)
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Last 24hrW5SW5W7W6SW4SW6W6CalmW5S3SW3SW3W4NW4E11E9E9E7NE7NE6NE5NE7NE4NE4
1 day agoW6CalmNW3W6W5SW5SW5SW3CalmCalmW3CalmCalm4SE8E11E11E11E8E9E4E7E8
G18
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2 days agoSW4SW5W5SW4W5S4W73SW4SW5SW3CalmCalmNW6N5E13
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Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Hilo
Click for Map
Sat -- 02:42 AM HST     0.65 feet Low Tide
Sat -- 05:57 AM HST     Sunrise
Sat -- 06:41 AM HST     0.93 feet High Tide
Sat -- 11:08 AM HST     Moonrise
Sat -- 12:51 PM HST     0.02 feet Low Tide
Sat -- 06:40 PM HST     Sunset
Sat -- 08:46 PM HST     2.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.80.70.70.70.80.90.90.80.70.50.20.100.10.40.71.21.622.22.22.11.8

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Sat -- 03:47 AM HST     0.30 feet Low Tide
Sat -- 06:00 AM HST     Sunrise
Sat -- 08:38 AM HST     0.76 feet High Tide
Sat -- 11:11 AM HST     Moonrise
Sat -- 01:41 PM HST     0.25 feet Low Tide
Sat -- 06:43 PM HST     Sunset
Sat -- 09:22 PM HST     2.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.80.50.30.30.40.50.70.70.80.70.50.40.30.30.40.60.91.31.722.22.11.9

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.
Link to Loop

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Wind Forecast for (3,6,7,8)
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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.