Sunday, April22, 2018 L-36.com


Marine Weather and Tides
Kalaoa, 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 5:55AMSunset 6:41PM Saturday April 21, 2018 8:52 PM HST (06:52 UTC) Moonrise 11:13AMMoonset 12:00AM Illumination 44% Phase: First Quarter Moon; Moon at 7 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- 342 Pm Hst Sat Apr 21 2018
.small craft advisory in effect through Sunday afternoon...
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. Isolated showers through the night.
Sunday..West of the big island, winds variable less than 10 knots becoming west 10 knots in the afternoon. NEar south point, east winds to 25 knots. Wind waves 9 feet. Northwest swell 3 feet. Isolated showers through the day. Haze in the afternoon.
Sunday night..West of the big island, west winds 10 knots in the evening becoming variable less than 10 knots. NEar south point, east winds to 25 knots. Wind waves 9 feet. Northwest swell 3 feet. Haze through the night. Isolated showers through the night.
Monday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. Northwest swell 4 feet. Haze. Isolated showers.
Monday night..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 9 feet. Northwest swell 4 feet. Haze. Isolated showers.
Tuesday..Winds variable less than 10 knots west of the big island...east to 25 knots near south point. Wind waves 10 feet. Northwest swell 3 feet. Haze through the day. Isolated showers through the day.
Tuesday night..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 through the night. Isolated showers through the night.
Wednesday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 9 feet. North swell 3 feet. Haze. Isolated showers.
Thursday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves 8 to 9 feet. Northwest swell 3 feet. Haze. Isolated showers.
PHZ100 342 Pm Hst Sat Apr 21 2018
Synopsis for hawaiian coastal waters.. A surface high far northeast of the area will depart while another high fills in from the northwest by Sunday. An approaching front late next week may weaken winds by Thursday.

7 Day Forecast for Marine Location Near Kalaoa, HI
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location: 19.75, -156.05     debug


Area Discussion for -
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Fxhw60 phfo 220632
afdhfo
area forecast discussion
national weather service honolulu hi
832 pm hst Sat apr 21 2018

Synopsis
High clouds moving northeastward within the subtropical jet
stream will cover maui and the big island tonight and Sunday.

Trade showers are expected to decrease overnight, leading to drier
weather across windward and mauka areas for Sunday. Another area
of low level moisture will increase trade showers Monday night
into Tuesday. Trade winds will become locally windy Monday into
Tuesday, then slowly decline later in the week. A cold front may
push down the chain with clouds and showers by next weekend.

Discussion
Trade wind weather will continue for the next several days as a
strong surface high passes far north of the islands on Monday.

This high will strengthen trade winds to locally windy levels
across the area Monday through Tuesday. Wind speeds will
gradually decrease after that and trade flow may possibly become
disrupted starting Friday as a surface low passes far to the
north. Models disagree on whether or not we will maintain light
trades on Friday or if local diurnal winds will take over. By
Friday night and Saturday, models show a late-season frontal
boundary passing down the chain, with breezy trades returning
afterwards.

Thick middle and high clouds, associated with the subtropical
jet, continue to cover maui county and the big island, with oahu
and kauai on the northern edge. Models keep this area around through
Sunday. At lower levels, the back edge of an area of scattered to
broken clouds and showers riding in on the trades is approaching
the big island. This should lead to fewer windward and mauka
showers later in the night and into Sunday for most of the state.

Both GFS and ECMWF show another trade wind shower area arriving
across windward maui and the big island late Monday night or
Tuesday. However, this week looks to be fairly quiet. Shower
timing and placement on Friday will depend on how much trade flow
is disrupted. However, expect an increase in showers Friday night
into Saturday associated with the frontal boundary.

Aviation
A high pressure ridge north of the islands will continue to
produce moderate to locally strong trade winds across the
islands. An upper level jet stream will continue to produce
moderate turbulence over the islands this evening. A stable
atmosphere will keepVFR conditions in effect for most areas with
lower ceilings and periods of scattered showers expected along
windward slopes of each islands.

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

Conditions are expected to remain in place overnight for most
areas.

Airmet tango remains in effect for moderate low level turbulence
over and downwind of mountain ranges for all islands due to the
moderate to breezy trade winds. Expect these conditions to
continue through at least Sunday.

Models show an area of moderate to severe upper level clear air
turbulence over the islands, which is covered under sigmet uniform
series. The forecast shows this area sticking around into Sunday,
but weakening to moderate levels overnight. As this happens the
sigmet will be able to be dropped and could prompt another airmet
tango for moderate upper level turbulence over at least part of
the local area.

Marine
Fresh to strong trades are forecast to hold through much of the
upcoming week as high pressure remains established to the north.

The small craft advisory currently in place for most marine areas
from oahu to the big island will hold through Sunday. This
advisory will likely be extended and potentially expanded to other
waters Monday through Wednesday as high pressure strengthens and
a moderate northwest swell builds down the island chain boosting
seas up to around the 10 ft mark.

Rough surf is forecast to persist through the week along east facing
shores due to fresh to strong trades holding in place locally and
just upstream of the area. The best chance for advisory-level surf
will come Tuesday through Thursday as the trades increase locally
and expand farther upstream in response to 1030-1035 mb high
building to the north. Although confidence remains low this far out
in the forecast, there could be a break in the trades by Friday
as a front moves into the area.

A new northwest (320 deg) swell is expected to slowly fill in late
Sunday afternoon, peak Monday, then slowly ease through midweek.

This source is from a potent system that reached storm-force
category Friday as it crossed the date line just south of the
aleutians between 40n and 50n (around 2000 miles northwest of the
state). Surf is forecast to peak on Monday at heights below advisory
levels along north and west facing shores.

A reinforcing moderate northwest (330 deg) swell is forecast to fill
in Thursday, peak Thursday night into Friday, then ease into the
weekend. This reinforcement will be from a developing storm that is
currently near the kamchatka peninsula and forecast to track east
while skirting the aleutian islands Sunday through Wednesday.

Surf associated with this feature should remain below advisory
levels along north and west facing shores.

A reinforcing southwest (220 deg) swell is forecast to fill in
Monday and hold through midweek due to recent activity across the
southern pacific tasman sea. Small to moderate surf will result
along south facing shores each day.

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

Discussion... Powell
aviation... Bohlin
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KWHH1 23 mi52 min NE 1.9 G 2.9 78°F 80°F1017.4 hPa (+1.9)
ILOH1 - 1617760 - Hilo, HI 53 mi52 min WSW 4.1 G 5.1 73°F 76°F1019 hPa (+1.6)
KLIH1 - 1615680 - Kahului Bay, Maui, HI 82 mi52 min NE 16 G 20 75°F 77°F1018.1 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, HI7 mi59 minSSE 510.00 miMostly Cloudy78°F66°F69%1017.1 hPa

Wind History from HKO (wind in knots)
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Last 24hrNE7CalmE3E3SE8SE8NE8E7NE7NE3E3CalmSW4S5S11S10SW9S10S9S8S10S8S6S5
1 day agoE5SE4SE3SE7E4E3SE5E6SE6E4E4SE5CalmW5NE12
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2 days agoCalmNW5W4NW5CalmSE4CalmE3NE3CalmCalmCalmS4S9S10S9SW10SW7W4CalmS5S5SW4SE8

Tide / Current Tables for Kailua Kona, Hawaii Island, Hawaii
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Kailua Kona
Click for Map
Sun -- 12:42 AM HST     Moonset
Sun -- 04:59 AM HST     0.37 feet Low Tide
Sun -- 06:00 AM HST     Sunrise
Sun -- 09:15 AM HST     0.67 feet High Tide
Sun -- 11:46 AM HST     First Quarter
Sun -- 12:13 PM HST     Moonrise
Sun -- 02:54 PM HST     0.13 feet Low Tide
Sun -- 06:44 PM HST     Sunset
Sun -- 10:41 PM HST     1.76 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.10.80.60.40.40.40.50.60.70.70.60.40.30.20.10.20.40.611.31.61.71.8

Tide / Current Tables for Kailua Kona, Big Island, Hawaii
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Kailua Kona
Click for Map
Sun -- 12:42 AM HST     Moonset
Sun -- 04:51 AM HST     0.14 feet Low Tide
Sun -- 06:00 AM HST     Sunrise
Sun -- 10:04 AM HST     0.68 feet High Tide
Sun -- 11:46 AM HST     First Quarter
Sun -- 12:13 PM HST     Moonrise
Sun -- 02:52 PM HST     0.30 feet Low Tide
Sun -- 06:44 PM HST     Sunset
Sun -- 10:16 PM HST     1.91 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.410.70.40.20.10.20.40.50.60.70.60.60.40.30.30.40.60.81.21.51.81.91.9

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 (2,6,7,8)
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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.