Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Maunaloa, 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 6:04AMSunset 6:54PM Saturday April 21, 2018 5:40 AM HST (15:40 UTC) Moonrise 11:15AMMoonset 12:00AM Illumination 37% 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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PHZ116 Kaiwi Channel- 319 Am Hst Sat Apr 21 2018
.small craft advisory in effect from this evening through Sunday afternoon...
Today..East winds 20 knots. Wind waves 7 feet. Northwest swell 4 feet. Isolated showers.
Tonight..East winds to 25 knots. Wind waves 8 feet. Northwest swell 4 feet. Isolated showers through the night.
Sunday..East winds to 25 knots. Wind waves 8 feet. Northwest swell 4 feet. Isolated showers.
Sunday night..Northeast winds to 25 knots. Wind waves 8 feet. Northwest swell 5 feet. Isolated showers through the night.
Monday..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 6 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Monday night..Northeast winds to 25 knots. Wind waves 9 feet. Northwest swell 5 feet. Scattered showers.
Tuesday..East winds to 25 knots. Wind waves 9 feet. Northwest swell 4 to 5 feet. Scattered showers.
Wednesday..East winds to 25 knots. Wind waves 9 feet. North swell 3 to 4 feet. Scattered showers.
PHZ100 319 Am Hst Sat Apr 21 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 Maunaloa, HI
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location: 21.1, -157.2     debug


Area Discussion for -
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Fxhw60 phfo 211330
afdhfo
area forecast discussion
national weather service honolulu hi
330 am hst Sat apr 21 2018

Synopsis
Breezy trade wind weather is expected over the weekend and into
next week, 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
A 1032 mb high near 40n135w, far northeast of the main hawaiian
islands is driving locally strong trade winds across the state
this morning. Radar shows scant shower activity upwind of the
islands, but satellite loop shows broken to overcast middle and
high clouds lingering across maui county and the big island.

Overnight soundings showed pw falling below 1.3 inches with
increasing stability.

Models show the high pressure to the north will keep trade winds
on the breezy side through the middle of next week, 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. Models show the layered mid and
upper level clouds may linger across the eastern half of the
state into next week, possibly drifting south of the islands
Tuesday. We have increased sky cover in the gridded database to
account for this. Clearer weather is then expected through the
rest of the work week. GFS shows a new low forming north of the
state next weekend, disrupting trade flow. However, ECMWF develops
this low much farther north with far less trade flow disruption.

We will follow the ECMWF scenario for now.

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

Low clouds and showers will favor windward and mauka areas, with
occasional MVFR CIGS vsbys expected. A few showers will also spill
leeward from time to time, but predominantlyVFR conditions should
prevail.

Airmet sierra is in effect for mountain obscuration over windward
sections of maui and the big island. Conditions will likely
remain in place through much of the day. The airmet may need to be
expanded to include molokai and oahu later this morning, and kauai
this afternoon.

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 tonight. 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 northeast of the area will move northeast through
the weekend. This high continues to produce locally strong trade
winds over hawaiian waters. A small craft advisory (sca) continues
for strong trade winds in the windier areas near maui 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 tonight for waters around lanai,
molokai and oahu.

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 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 peak today. 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.

Small craft advisory from 6 pm this evening to 6 pm hst Sunday
for oahu leeward waters-kaiwi channel-maui county windward
waters-maui county leeward waters.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51202 - Mokapu Point, HI (098) 33 mi36 min 75°F5 ft
OOUH1 - 1612340 - Honolulu, HI 38 mi40 min NE 2.9 G 4.1 73°F 77°F1017.1 hPa (-1.0)
MOKH1 - 1612480 - Mokuoloe, HI 39 mi64 min ENE 8 G 12 74°F 76°F1017.4 hPa
51210 39 mi40 min 75°F5 ft
51205 41 mi40 min 76°F5 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 41 mi40 min NNE 8 G 9.9 1017.1 hPa (-1.0)
51211 42 mi40 min 77°F3 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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G7

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaunakakai, Molokai Airport, HI6 mi46 minNE 13 G 1910.00 miMostly Cloudy72°F66°F84%1017.7 hPa

Wind History from HMK (wind in knots)
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1 day agoNE9
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2 days agoNE8
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E11NE9NE9NE11
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G17

Tide / Current Tables for Kolo, Molokai Island, Hawaii
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Kolo
Click for Map
Sat -- 04:19 AM HST     0.11 feet Low Tide
Sat -- 06:04 AM HST     Sunrise
Sat -- 09:05 AM HST     0.44 feet High Tide
Sat -- 11:15 AM HST     Moonrise
Sat -- 01:45 PM HST     0.11 feet Low Tide
Sat -- 06:50 PM HST     Sunset
Sat -- 09:42 PM HST     1.81 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.70.40.20.10.10.20.30.40.40.40.30.20.10.10.20.40.611.31.61.81.81.7

Tide / Current Tables for Kaunakakai, Molokai (Hawaii)
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Kaunakakai
Click for Map
Sat -- 03:55 AM HST     0.23 feet Low Tide
Sat -- 06:04 AM HST     Sunrise
Sat -- 08:48 AM HST     0.63 feet High Tide
Sat -- 11:14 AM HST     Moonrise
Sat -- 01:45 PM HST     0.18 feet Low Tide
Sat -- 06:49 PM HST     Sunset
Sat -- 09:28 PM HST     1.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.70.40.30.20.30.40.50.60.60.60.50.30.20.20.30.50.81.21.51.81.91.91.8

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

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (11,2,3,4)
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Ground Weather Radar Station Molokai, HI
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weather_mapweather_map weather_map

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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.