Monday, September25, 2017 L-36.com


Marine Weather and Tides
Heeia, HI

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:20AMSunset 6:24PM Monday September 25, 2017 12:10 PM HST (22:10 UTC) Moonrise 11:10AMMoonset 10:34PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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- 928 Am Hst Mon Sep 25 2017
Today..Northeast winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet in the morning. Isolated showers in the morning.
Tonight..Northeast winds 10 knots. Wind waves 3 feet. Isolated showers.
Tuesday..Northeast winds 10 knots. Wind waves 3 feet. Isolated showers in the morning.
Tuesday night..Northeast winds 15 knots. Wind waves 4 feet. Northwest swell 3 feet. Isolated showers.
Wednesday..East winds 10 knots. Wind waves 3 feet. Northwest swell 3 feet. Isolated showers.
Wednesday night..Northeast winds 15 knots. Wind waves 3 feet. Northwest swell 3 feet. Isolated showers through the night.
Thursday..East winds 15 knots. Wind waves 4 feet. North swell 3 feet. Isolated showers.
Friday..East winds 10 knots. Wind waves 4 feet. North swell 3 feet. Isolated showers.
PHZ100 928 Am Hst Mon Sep 25 2017
Synopsis for hawaiian coastal waters.. A weak trough will approach and move over the waters today through Wednesday. A frontal boundary will stall north of the waters and dissipate Thursday through Friday.

7 Day Forecast for Marine Location Near Heeia, HI
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location: 21.44, -157.81     debug


Area Discussion for -
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Fxhw60 phfo 252029
afdhfo
area forecast discussion
national weather service honolulu hi
1029 am hst Mon sep 25 2017

Synopsis
A weak ridge to our north and a weak trough to our east will keep
the trades too light to override sea breezes today. Over the next
few days, a slow increase in the trades is expected as the ridge
strengthens. Locally breezy trades by Thursday will turn to
southeast winds Friday and Saturday with more humid conditions, as
well as increased cloudiness and showers.

Discussion
At the surface, a weak ridge is roughly 300 mi N of kauai,
extending SW to NE from there. In addition, a weak, slow-moving
trough is just E of the islands along 154w. The combination of
these two features is keeping the pressure gradient quite weak and
only enough to support gentle background trades. Diurnal island
circulations are overriding the trades in many areas. Water vapor
imagery shows a nearly stationary upper low about 400 mi NE of
hilo, but we are on the subsident side of this feature. Early
morning soundings confirmed a stout inversion near 7500 feet,
helping to keep our weather fairly quiet.

Expecting a fair amount of cloudiness to develop over interior
and leeward sections this afternoon once the winds switch to sea
breezes in most areas. There's enough low level moisture available
for some spotty short-lived showers but the inversion will keep a
lid on things. Should see considerable clearing tonight in most
areas, but the gentle background trades should keep a bit of
cloudiness and perhaps a shower or two for windward and mauka
sections.

Guidance shows the surface trough just to our E weakening tue, and
the ridge to the N strengthening a little. This will begin a very
gradual strengthening trend in our trades that will continue through
thu when trades reach locally breezy levels. Will probably be
making subtle upward adjustments to the wind grids for this
afternoon for the wed-thu time period to bring them more in line
with trends in the latest guidance. At the same time, a narrow
band of deeper moisture along and E of 150w is progged to push w
toward the islands in the trades, and may bring us a modest
increase in showers Tue night (starting near the big island)
through about Wed night or thu.

Changes look to be on the horizon for the end of the work week as
the models are showing a fall-like low developing to the NW of the
islands. The low itself will not have any direct effects on us,
but the local pressure gradient will turn the winds around to se
for a couple of days, with more than sufficient moisture for
showers and uncomfortable humidity. By Sunday there are huge
differences in the model guidance in whether or not the trades
come back, all tied to their handling of the surface low to the
nw.

Aviation
Brief MVFR conditions are possible over windward and mauka
sections in passing showers, being carried by the light to
moderate trade winds. The trades will be light enough to allow for
localized sea breezes over sheltered leeward areas, leading to
cloud buildups and possible showers during the afternoon.

OtherwiseVFR conditions will prevail.

No airmets are currently in effect and none are anticipated.

Marine
Light to moderate trades are expected to persist through the first
half of the week as a weak surface trough approaches the islands
from the east. A return of moderate to fresh trades are forecast
through the second half of the week as the trough departs to the
west. Some of the typically windier channel waters may even near
small craft advisory levels Thursday through Friday.

Surf along south facing shores will remain small through the week
with mainly a mix of background southeast and southwest swells
expected. The next long-period pulse out of the southwest should
fill in Tuesday night through midweek, leading to a slight
increase in surf.

Small, short period, northwest swell energy should be enough to
keep the surf from going flat along north facing shores through
the week. A reinforcing north-northwest swell should reach the
local waters late Wednesday through Thursday.

Surf along east facing shores will remain small through the first
half of the week as the trades locally and upstream of the state
remain light. Small and choppy surf will likely return as the
trades fill back in through the second half of the week.

Hfo watches warnings advisories
None.

R ballard bravender kodama


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi40 min N 6 G 8 80°F 82°F1015.3 hPa
51210 4 mi40 min 82°F3 ft
51202 - Mokapu Point, HI (098) 7 mi36 min 81°F4 ft
OOUH1 - 1612340 - Honolulu, HI 10 mi40 min E 4.1 G 8.9 84°F 81°F1015.4 hPa
51211 13 mi40 min 82°F2 ft
51201 - Waimea Bay, HI (106) 23 mi38 min 79°F3 ft

Wind History for Mokuoloe, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi73 minNE 67.00 miMostly Cloudy85°F71°F63%1014.1 hPa
Honolulu, Honolulu International Airport, HI9 mi17 minSSE 1010.00 miPartly Cloudy85°F68°F57%1014.3 hPa
Wheeler Air Force Base / Oahu, HI12 mi72 minN 010.00 miMostly Cloudy83°F65°F56%1014 hPa
Oahu, Kalaeloa Airport, HI16 mi17 minSSE 810.00 miOvercast83°F69°F63%1015.6 hPa

Wind History from HNG (wind in knots)
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Last 24hrNE8NE9E7NE9NE8N8NE6----NE84NE4NE6----435S3E4N3NE6NE5NE6
1 day agoE8----NE7NE7--NE9NE7E5NE7NE4NE6NE6E5NE5E8NE7--E8E7NE7E6--NE10
2 days agoNE12E10NE10NE11
G15
--NE8NE8----E9E8E8E8E9E8--NE53E4NE4NE7NE9--NE10

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
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Mon -- 12:26 AM HST     0.34 feet Low Tide
Mon -- 06:21 AM HST     Sunrise
Mon -- 07:45 AM HST     1.76 feet High Tide
Mon -- 11:10 AM HST     Moonrise
Mon -- 02:55 PM HST     0.65 feet Low Tide
Mon -- 06:24 PM HST     Sunset
Mon -- 07:25 PM HST     0.91 feet High Tide
Mon -- 10:35 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.50.711.31.61.71.81.71.51.210.80.70.60.70.80.90.90.90.80.70.6

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Mon -- 06:20 AM HST     Sunrise
Mon -- 06:49 AM HST     1.77 feet High Tide
Mon -- 11:09 AM HST     Moonrise
Mon -- 02:13 PM HST     0.73 feet Low Tide
Mon -- 06:23 PM HST     Sunset
Mon -- 06:28 PM HST     0.97 feet High Tide
Mon -- 10:34 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.50.711.31.61.71.81.71.51.31.10.90.80.70.80.80.9110.90.80.70.6

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
cpac_satellite

GOES Local Image of Hawaii    EDIT
Geos

Wind Forecast for (18,4,5,8)
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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.