Thursday, May24, 2018 L-36.com


Marine Weather and Tides
Hickam Housing, HI

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:48AMSunset 7:08PM Thursday May 24, 2018 4:04 AM HST (14:04 UTC) Moonrise 3:06PMMoonset 2:45AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 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- 317 Am Hst Thu May 24 2018
.small craft advisory in effect through early Friday morning...
Today..East winds to 25 knots. Wind waves 8 feet. Northwest swell 3 feet. Isolated showers.
Tonight..East winds to 25 knots. Wind waves 8 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds 20 knots. Wind waves 7 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 20 knots. Wind waves 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Saturday..East winds 20 knots. Wind waves 7 feet. Northwest swell 3 feet in the afternoon. Scattered showers in the morning, then isolated showers in the afternoon.
Saturday night..East winds 20 knots. Wind waves 7 feet. Northwest swell 3 feet. Isolated showers through the night.
Sunday..East winds 15 knots. Wind waves 5 to 6 feet. Northwest swell 3 feet. Isolated showers.
Monday..East winds 15 knots. Wind waves 5 feet. Scattered showers.
PHZ100 317 Am Hst Thu May 24 2018
Synopsis for hawaiian coastal waters.. High pressure passing by to the north of the state will keep a breezy trade wind flow in place across the coastal waters through Friday. The trades are expected to trend down over the weekend through early next week as an approaching front shifts the high northeastward away from the island chain.

7 Day Forecast for Marine Location Near Hickam Housing, HI
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location: 21.31, -157.91     debug


Area Discussion for -
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Fxhw60 phfo 240628
afdhfo
area forecast discussion
national weather service honolulu hi
828 pm hst Wed may 23 2018

Synopsis
Breezy trade winds are expected to persist into the start of the
memorial day holiday weekend. The strong trades will continue to
transport low clouds and showers that will focus over windward
areas, with a few brief showers carried over to leeward sections
of some of the smaller islands. The trades are expected to ease
somewhat from Sunday into early next week. Trade showers may
increase slightly on Saturday and next Tuesday as areas of
additional moisture moves through.

Discussion
The tight pressure gradient south of a 1031 mb surface high
centered near 35n 158w, or slightly more than 900 miles due north
of honolulu, is maintaining strong and gusty trade winds across
the aloha state early this evening. Elsewhere, the leading edge of
a band of broken to locally overcast low clouds and showers along
the tail end of a dissipating front is about 330 miles north-
northeast of hilo. This leading edge is moving slowly southward.

Water vapor imagery indicates a weak mid-tropospheric ridge is
directly above the islands, which is keeping the atmosphere
relatively stable across the region. As a result, there is a
strong low-level trade wind inversion near 7 thousand feet.

Satellite derived estimates of precipitable water (pw) indicates
values are 1.2-1.3 inches near the smaller islands, while they are
around 1.1 inches in the vicinity of the big island. Loops of
satellite imagery and radar reflectivity data show an area of
broken low clouds and scattered showers sagging slowly toward the
south-southwest across the smaller islands, with the leading edge
just starting to spread across the northern the big island. Most
of the low clouds and showers are banking up along the windward
sections of the islands, but the breezy trades are transporting a
few brief showers over to leeward sections of some of the smaller
islands. Expect these low clouds and showers to eventually spread
south across the remainder of the windward big island later
tonight and early Thursday morning.

The forecast guidance indicates the surface high far north of the
state will continue to move slowly eastward. The pressure gradient
south of this feature will maintain the breezy trade winds across
the islands at least through Saturday. At the same time, the mid-
tropospheric ridge will produce stable atmospheric conditions in
the vicinity of the state through Saturday. This will maintain a
significant low-level inversion over the islands, which will
continue to keep a lid on the low clouds arriving in the trade
wind flow for the next few days. The band of low clouds and
showers associated with the dissipating front, which was described
above, will continue to sag down toward the state. The remnants
of this band are expected to provide an increase in low-level
moisture and an uptick in windward showers across much of the
state from Friday night through Saturday.

The surface high will eventually begin to have less influence on
the islands once it moves far northeast of the area later this
weekend. This will likely result in a gradual reduction in trade
wind speeds. At the same time, the mid-tropospheric ridge is
forecast to weaken on Sunday and Monday as an upper-level low
develops overhead by next Tuesday. This could bring an increase
in trade showers late Monday and Tuesday, and may induce a surface
trough near or west of the islands by the middle of next week.

There is still a great deal of uncertainty in the long-range
forecast at the moment. However, if this scenario did occur,
surface winds passing across the active lava flows and erupting
volcano on the big island could become problematic for areas of
the big island outside of the puna and kau districts.

In the meantime, a special weather statement continues to highlight
the relatively light ashfall that is occurring across portions of
the big island's kau district. Several bursts of ash from
halemaumau kilauea crater have been noted recently in radar data
(extending as high as 5000-8000 feet), and all indications are
that this activity will continue for the foreseeable future.

Aviation
MainlyVFR conditions are expected for all TAF sites through early
Thursday, though passing low clouds and showers may bring brief
MVFR ceiling and vis conditions along the windward areas.

Rather brisk trade winds continue across the area at least through
Thursday as a strong high pressure passing far north of the
islands. Airmet tango series remains posted for low level
turbulence over and immediately south and west of mountains below
8000 feet on all islands. These conditions are expected to persist
through Thursday.

Periodic explosive eruptions at kilauea halemaumau crater continue
to produce billows of volcanic ash at times, with the plume of
emissions predominately rising to slightly above the inversion
level and spreading to the southwest over kau district on the big
island. MVFR vis can be expected in this area. Sigmet tango
series for volcanic ash remains in effect.

Marine
High pressure passing by to the north of the state will keep a
breezy trade wind flow in place across the coastal waters through
Friday. The trades are expected to trend down over the weekend
through early next week as an approaching front shifts the high
northeastward away from the island chain. A small craft advisory
(sca) remains in effect for most marine zones tonight, and for
the waters east of the kauai channel with the exception of the
windward big island waters through Thursday night. SCA conditions
will likely continue into the Saturday for the typically windy
waters around maui and the big island.

No significant swells are expected, with surf remaining below
advisory levels through at least the middle of next week. A series
of south-southwest swells will continue through the next week,
keeping surf along south facing shores near to a notch above
the summertime average. The current small north-northwest swell
will slowly diminish through Thursday. Another small northwest
swell may give surf a slight bump along north facing shores over
the weekend. Breezy trade winds will deliver choppy short-period
waves to east facing shores into the weekend.

Hfo watches warnings advisories
Small craft advisory until 6 pm 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 oahu windward
waters-oahu leeward waters-kaiwi channel-maui county windward
waters-maui county leeward waters.

Small craft advisory until 6 am hst Thursday for kauai northwest
waters-kauai channel.

Discussion... Houston
aviation... Hui
marine... Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 2 mi46 min NNE 4.1 G 6 75°F 77°F1016.6 hPa
51211 3 mi64 min 77°F4 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi88 min ENE 12 G 15 76°F 79°F1017.4 hPa
51210 14 mi34 min 77°F6 ft
51207 14 mi40 min 76°F7 ft
51202 - Mokapu Point, HI (098) 14 mi60 min 77°F8 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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E3
G7
NE5
G9
NE6
G11
E3
G7
NE4
G10
NE8
G13
NE5
G11
E4
G11
E3
G6
NE11
G18
NE3
G9
NE6
G11
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G10
E6
G11
NE5
G8
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NE2
G6
NE4
G10
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G12
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G12
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E6
G16
NE3
G7
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NE4
NE4
G11
NE4
G12
N4
G8
E5
G10
NE7
G11
NE3
G9
NE6
G15
NE11
G17
NE8
G15
NE6
G16
NE11
G17
NE6
G18
NE6
G13
NE5
G10
NE5
G11
N5
G9
NE2
G6
N3
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E1
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G7
NE5
G10
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G11
NE8
G12
SE8
G13
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G17
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G9
NE8
G13
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G15
NE7
G10
NE4
G8
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G12
NE7
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N1
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NE7
G12
NE5
G9
NE5
G9

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI3 mi71 minENE 1010.00 miLight Rain75°F66°F74%1016.8 hPa
Oahu, Kalaeloa Airport, HI9 mi71 minE 310.00 miPartly Cloudy73°F64°F76%1017.9 hPa
Kaneohe, Marine Corps Air Station, HI12 mi2.1 hrsENE 10 G 1910.00 miMostly Cloudy70°F68°F93%1016.3 hPa
Wheeler Air Force Base / Oahu, HI13 mi68 minNNW 410.00 miMostly Cloudy69°F66°F93%1016.4 hPa

Wind History from HNL (wind in knots)
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Last 24hrNE8NE8NE8
G18
NE8E14
G21
NE11
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NE13
G21
NE16
G22
E17
G25
E17
G26
NE13
G21
E13
G23
NE15
G19
NE18
G23
NE17
G23
NE14E13NE11NE14E11E9NE12NE10NE9
1 day agoNE7NE8NE5E11E10
G15
N10NE12NE16
G22
NE12
G21
NE12
G21
6
G17
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NE13NE10NE11NE7NE10NE13NE9NE10E10NE9NE10NE9
2 days agoNE3NE6NE12E14
G21
NE12
G16
E14
G22
NE12
G20
NE12
G19
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G26
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G29
E16
G24
E18
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NE12
G17
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NE11NE12NE19
G23
NE12
G22
NE13NE12
G19
NE8E14
G18
E10NE6

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Thu -- 02:45 AM HST     Moonset
Thu -- 05:50 AM HST     Sunrise
Thu -- 06:48 AM HST     -0.24 feet Low Tide
Thu -- 01:34 PM HST     1.47 feet High Tide
Thu -- 03:05 PM HST     Moonrise
Thu -- 07:06 PM HST     Sunset
Thu -- 07:22 PM HST     0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.41.10.80.40.1-0.2-0.2-0.10.20.60.91.31.41.51.31.10.80.60.40.50.60.81.1

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Thu -- 02:44 AM HST     Moonset
Thu -- 05:49 AM HST     Sunrise
Thu -- 06:04 AM HST     -0.25 feet Low Tide
Thu -- 12:38 PM HST     1.38 feet High Tide
Thu -- 03:04 PM HST     Moonrise
Thu -- 06:41 PM HST     0.40 feet Low Tide
Thu -- 07:05 PM HST     Sunset
Thu -- 11:50 PM HST     1.18 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.10.80.40.1-0.2-0.3-0.20.10.40.81.21.31.41.310.80.60.40.40.50.711.1

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.
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Wind Forecast for (10,2,3,4)
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Ground Weather Radar Station Molokai, 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.