Thursday, January18, 2018 L-36.com


Marine Weather and Tides
Maunaloa, 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 7:09AMSunset 6:13PM Thursday January 18, 2018 3:23 AM HST (13:23 UTC) Moonrise 8:19AMMoonset 7:52PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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- 939 Pm Hst Wed Jan 17 2018
.small craft advisory in effect through early Friday morning...
Rest of tonight..East winds to 30 knots. Wind waves 13 feet. Northwest swell 10 feet. Isolated showers.
Thursday..East winds to 30 knots. Wind waves 13 feet. North swell 7 feet. Isolated showers.
Thursday night..East winds to 30 knots. Wind waves 13 feet. North swell 6 feet. Isolated showers.
Friday..East winds to 25 knots. Wind waves 12 feet. North swell 4 feet. Isolated showers through the day.
Friday night..East winds to 25 knots. Wind waves 11 feet. North swell 3 feet. Isolated showers.
Saturday..East winds 20 knots veering southwest in the afternoon. Wind waves 9 feet. North swell 3 feet. Isolated showers.
Saturday night..East winds 10 knots. Wind waves 7 feet. North swell 4 feet. Isolated showers.
Sunday..East winds 10 knots. Wind waves 6 feet. Northwest swell 5 to 7 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 5 to 6 feet. Northwest swell 7 to 8 feet. Isolated showers.
PHZ100 939 Pm Hst Wed Jan 17 2018
Synopsis for hawaiian coastal waters.. Strong high pressure passing north of the islands will shift eastward through Friday. Ridge north of the islands will weaken over the weekend as low pressure, currently near midway, lifts northeastward.

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 180635
afdhfo
area forecast discussion
national weather service honolulu hi
835 pm hst Wed jan 17 2018

Synopsis
Strong and gusty trade winds are in store through Thursday as
robust surface high pressure passes north of the state. Clouds and
showers will favor windward and mauka areas, though a few showers
will periodically spread leeward on the gusty trades. Winds will
gradually decrease from Friday into the weekend as the surface
high is pushed far northeast of the islands.

Discussion
Strong and gusty trade winds continue to develop this evening.

A 1036 mb surface high is located about 1,100 miles north of
kauai, while a decaying front is stalling about 50 miles north of
kauai. A rather strong ridge aloft over the region is maintaining
a solid inversion based at 3,500 to 5,500 ft, according to the
afternoon soundings. Winds have been steadily ramping up into this
evening, with numerous stations on maui county and the big island
reporting advisory level winds.

A further increase in winds is expected into Thursday as the
surface high passes north of the state and builds to 1037 mb. The
inversion will remain unchanged in most areas, causing the trade
winds to be accelerated over and around island terrain. As a
result, the wind advisory remains in effect for all islands. With
models showing winds near the inversion level increasing another
5 kt or so, we will have to closely monitor locations such as the
leeward kohala districts for the potential for high wind warning
conditions. The wind advisory currently runs through Thursday
afternoon, though it will likely need to be extended through
Thursday night for the state and possibly into Friday for portions
of the big island and maui.

Showers will focus across windward slopes during the next couple
of days. The atmosphere will remain stable as the inversion holds
firm. The above mentioned decaying frontal band will sag
southward and likely reach kauai tonight, making windward portions
of the garden isle wetter than most areas. This band of moisture
is expected to slowly lift northward late Thursday and Friday. A
separate area of poorly-defined low level moisture is expected to
fill in across windward big island tonight, then spread up the
island chain on Friday.

Trade winds will begin to decrease on Friday and continue
decreasing into the weekend. During this time, the surface high
will weaken and move to the northeast of the state, leaving an
associated surface ridge about 300 miles north of kauai by Friday
night. A north pacific trough will erode the surface ridge during
the weekend. During this time, trade winds will veer out of the
east to east- southeast and may become light enough for daytime
sea breezes to dominate across the western end of the island
chain.

Beyond the weekend, models are not in good agreement on the
details of a developing low near midway atoll. However, models do
show moderate easterly trades hanging on over the big island with
southeasterly flow across the smaller islands. The mid level
ridge currently over the state will likely erode significantly,
leading to some instability and the potential for a few heavier
showers.

Aviation
Robust high pressure passing N of the area will support strong
trade winds through Thursday while a ridge aloft will maintain a
stable island atmosphere. This will lead to strong low-level
winds, with airmet tango in effect for moderate to severe turbulence
near and downwind of the terrain, and for surface wind speeds.

Two bands of low clouds embedded within the trade flow will make
for locally cloudy conditions, with a stalled frontal band moving
over kauai from the e, and a more diffuse cloud band near and
upwind of the big island, with fewer clouds over maui county and
oahu. Radar is detecting isolated to scattered light showers
within these cloud bands, and thus far airmet sierra for mountain
obscuration is not anticipated, and observations will be monitored
for its possible issuance.

Marine
For the evening update, the high surf warning for north and west
facing shores has been lowered to an advisory this evening based on
the latest buoy observations and trends. Surf will dip below
advisory levels early Thursday for north and west facing shores.

Along east facing shores, a high surf advisory is now in effect
from 6 am hst Thursday through 6 pm hst Friday due to strong
trades locally and upstream.

The ascat pass earlier today showed strong- to gale-force winds over
the local waters (gales were shown across the alenuihaha channel),
which is in line with the current forecast package. Seas at the
exposed nearshore pacioos buoys reflect this and show 8 to 12 ft due
to a combination of rising wind waves and a moderate northwest swell
that is trending down. Strong- to gale-force winds are forecast to
hold through Friday across the waters as strong high pressure shifts
eastward to the north. As a result, the small craft advisory for all
waters remains in effect through Thursday night and will likely be
extended for most waters through Friday in later packages.

For the upcoming weekend, forecast confidence begins to lower due to
significant differences shown between the ECMWF and GFS solutions.

The GFS advertises light and variable winds, while the ECMWF depicts
moderate to fresh trades holding. The current forecast is more in
line with the GFS solution, but is subject to changes over the
coming days. Despite these differences, winds will likely trend down
over the weekend, which will allow surf along east facing shores to
begin lowering, as well as seas across all waters.

A small northwest swell is expected Sunday, that will be reinforced
with a moderate northwest swell by Monday, potentially reaching
advisory levels. This reinforcement will peak by late Monday, then
gradually lower through midweek.

Hfo watches warnings advisories
Wind advisory until 6 pm hst Thursday for niihau-kauai-oahu-
molokai-lanai-kahoolawe-maui windward west-maui leeward west-
maui central valley-windward haleakala-leeward haleakala-kona-
south big island-big island north and east-kohala-big island
interior.

High surf advisory until 6 am hst Thursday for niihau-kauai
leeward-waianae coast-oahu north shore-molokai leeward-maui
central valley.

High surf advisory until 6 pm hst Friday for kauai windward-oahu
koolau-molokai windward-maui windward west-windward haleakala.

High surf advisory from 6 am Thursday to 6 pm hst Friday for
olomana-south big island-big island north and east.

Gale warning until 6 am hst Friday for maalaea bay-pailolo
channel-alenuihaha channel-big island leeward waters-big island
southeast waters.

Small craft advisory until 6 am hst Friday for kauai northwest
waters-kauai windward waters-kauai leeward waters-kauai channel-
oahu windward waters-oahu leeward waters-kaiwi channel-maui
county windward waters-maui county leeward waters-big island
windward waters.

Discussion... Powell
aviation... Birchard
marine... Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
51202 - Mokapu Point, HI (098) 33 mi49 min 76°F10 ft
OOUH1 - 1612340 - Honolulu, HI 38 mi53 min ENE 6 G 16 74°F 76°F1019.6 hPa
MOKH1 - 1612480 - Mokuoloe, HI 39 mi53 min ENE 13 G 17 74°F 75°F1021.4 hPa
51210 39 mi53 min 76°F9 ft
51205 41 mi53 min 76°F11 ft
KLIH1 - 1615680 - Kahului Bay, Maui, HI 41 mi53 min NE 19 G 24 74°F 75°F1020.7 hPa
51211 42 mi53 min 76°F4 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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N4
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NE5
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NE9
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E1
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N4
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E2
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--
N1
E1
W1
--
E1

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Wind History from HMK (wind in knots)
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Last 24hrNE11
G17
--------------------NE8NE16
G28
----NE22NE17--NE17
G28
--NE19
G31
NE19NE23NE23
G30
1 day agoNE12--------------------NE8NE13NE9
G20
N15NE11N16NE14--NE18NE18NE12NE11NE15
G24
2 days ago--------------------NE7NE11NE10NE11
G18
NE14NE16NE18NE14
G21
NE15
G24
NE14
G22
--NE13NE14NE15

Tide / Current Tables for Kolo, Molokai Island, Hawaii
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Kolo
Click for Map
Thu -- 05:13 AM HST     2.17 feet High Tide
Thu -- 07:08 AM HST     Sunrise
Thu -- 08:19 AM HST     Moonrise
Thu -- 12:16 PM HST     0.22 feet Low Tide
Thu -- 05:14 PM HST     0.82 feet High Tide
Thu -- 06:10 PM HST     Sunset
Thu -- 07:51 PM HST     Moonset
Thu -- 10:27 PM HST     0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.81.31.722.22.11.81.510.60.30.20.30.40.60.70.80.80.60.40.20.10.1

Tide / Current Tables for Kaunakakai, Molokai (Hawaii)
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Kaunakakai
Click for Map
Thu -- 05:04 AM HST     2.21 feet High Tide
Thu -- 07:07 AM HST     Sunrise
Thu -- 08:18 AM HST     Moonrise
Thu -- 12:08 PM HST     0.16 feet Low Tide
Thu -- 05:10 PM HST     0.83 feet High Tide
Thu -- 06:09 PM HST     Sunset
Thu -- 07:51 PM HST     Moonset
Thu -- 10:25 PM HST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.81.31.82.12.22.11.81.40.90.50.30.20.20.40.60.70.80.80.60.40.20.10.1

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 (8,2,3,4)
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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.