Monday, July23, 2018 L-36.com


Marine Weather and Tides
Urban Honolulu, HI

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Sunrise 6:00AMSunset 7:15PM Monday July 23, 2018 1:23 AM HST (11:23 UTC) Moonrise 4:15PMMoonset 2:47AM Illumination 80% 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- 907 Pm Hst Sun Jul 22 2018
Rest of tonight..Northeast winds 20 knots. Wind waves 6 feet. South swell 3 feet. Isolated showers.
Monday..Northeast winds 20 knots. Wind waves 6 feet. South swell 3 feet. Isolated showers in the morning, then scattered showers in the afternoon.
Monday night..Northeast winds 20 knots. Wind waves 7 feet. South swell 3 feet in the evening. Scattered showers.
Tuesday..Northeast winds 20 knots. Wind waves 7 feet. Isolated showers through the day.
Tuesday night..Northeast winds 20 knots. Wind waves 6 feet. Isolated showers in the evening. Scattered showers after midnight.
Wednesday..Northeast winds 20 knots. Wind waves 6 feet. Scattered showers through the day.
Wednesday night..Northeast winds 20 knots. Wind waves 6 feet. Scattered showers.
Thursday..East winds 20 knots. Wind waves 6 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 6 feet. Isolated showers.
PHZ100 907 Pm Hst Sun Jul 22 2018
Synopsis for hawaiian coastal waters.. Surface high pressure far north of the islands will maintain locally breezy trade winds this week.

7 Day Forecast for Marine Location Near Urban Honolulu, HI
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location: 21.29, -157.88     debug


Area Discussion for -
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Fxhw60 phfo 230635
afdhfo
area forecast discussion
national weather service honolulu hi
835 pm hst Sun jul 22 2018

Synopsis
A high pressure ridge north of the islands will keep moderate
trade winds in the forecast through the week. Periods of elevated
moisture will move up into the state from the tropics allowing
clouds and enhanced showers to develop across all islands. The
first of these wet trade events is ongoing and will continue
through Monday night for the eastern islands and Tuesday morning
for the western half of the state. A brief drying trend remains in
the forecast for Tuesday and Wednesday.

Discussion
In the big picture, a high pressure ridge remains in place far to
the north of the state keeping moderate trade winds in the
forecast through the week. An upper level trough is also located
just north of the islands with a subtropical jet stream streaming high
level cirrus clouds across the region.

In the lower levels a deep plume of moisture from the tropics has
moved into the islands from the southeast and a low level trough
shown on satellite is currently moving across the eastern half of
the state. Expect continued higher humidity levels with mostly
cloudy skies, and numerous windward showers through Monday night.

Periods of scattered showers will also drift over leeward areas.

The lava moisture plume on the big island, created by lava
flowing into the ocean, will interact with the additional moisture
and atmospheric instability to produce elevated precipitation
amounts near pahoa through the overnight hours. This unstable air
will pass through the eastern islands by Monday night and the
western half of the state by Tuesday morning with drier air
filtering back into the islands from the east.

Winds aloft within the boundary layer of the atmosphere between
the 3000 to 10000 foot level has shifted to a more east-southeast
direction as shown on 00z upper air soundings from hilo, and in
forecast model solutions through Monday night. This wind shift
will trend kilauea volcanic emissions more towards the west-
northwest wrapping round the northern slopes of the big island and
lingering just south of maui county. There is the potential for
some of this vog (volcanic smog) to reach the island of maui by
Monday morning and we will re-evaluate the vog forecast
trajectories tonight making adjustments the forecast if needed.

East-northeasterly boundary layer winds return on Tuesday, pushing
any vog emissions towards the southwest away from the northern
slopes of the big island and the rest of maui county.

Tuesday and Wednesday, drier and more stable air moves into the
state from the east with a noticeable decrease in island shower
activity. A lower trade wind subsidence inversion and decreasing
moisture levels will help to limit cloud development.

Wednesday night through Thursday, this brief drying period will
not last, as a second tropical moisture plume and weak low level
trough moving in from the east reaches the big island on Wednesday
night. This next round of higher moisture levels and instability
appears similar to the current round of clouds and enhanced shower
trends. Precipitable water (pw) amounts are similar to the first
wet trade wind event ranging from 1.5 to 2.0 inches. Therefore we
expect similar weather impacts with numerous showers returning
over windward and mountain areas along with periods of scattered
showers over leeward sections through Thursday night. The best
shower activity with tend to favor the overnight time periods.

Another drying trend returns on Friday and Saturday as more stable
air moves back across the region from the east. Scattered showers
will linger over windward and mountain slopes of all islands with
only isolated showers across leeward sections.

A third round of elevated moisture will arrive on Sunday. The
deeper moisture levels will remain south of the state with only
pw amounts hovering near 1.5 inches in the latest weather guidance
with only minor increases to windward and mountain showers in the
forecast.

Aviation
Locally breezy east winds will persist through the coming week.

Clouds and showers will increase over the smaller islands tonight as
a weak trough with additional low level moisture spreads over the
islands from the northeast. MVFR conditions could become
widespread over east facing slopes. An airmet for mountain
obscuration may become necessary by morning. The cloudy, showery
conditions are expected to continue throughout the day tomorrow.

Marine
Surface high pressure far north of the islands will continue to
produce locally breezy trade winds this week. A small craft
advisory (sca) remains in effect for maalaea bay and the pailolo
and alenuihaha channels through Monday afternoon. The SCA will
likely continue into mid-week for these same areas, and may
be expanded to include additional waters starting Monday night or
Tuesday.

The current long-period south swell will persist through early
Monday morning, and then gradually lower during the day on Monday.

A high surf advisory remains in effect through Monday afternoon
for south facing shores of all islands. Otherwise, only small
south swells are expected to maintain background surf along south
facing shores from Tuesday into next weekend. The trade winds
will continue to produce moderate short-period choppy surf along
east facing shores this week.

Hfo watches warnings advisories
High surf advisory until 6 pm hst Monday for niihau-kauai
windward-kauai leeward-oahu south shore-waianae coast-molokai-
lanai makai-kahoolawe-maui leeward west-maui central valley-
leeward haleakala-kona-south big island-big island north and
east-kohala.

Small craft advisory until 6 pm hst Monday for maalaea bay-
pailolo channel-alenuihaha channel.

Discussion... Bohlin
aviation... Bedal
marine... Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi36 min E 2.9 G 5.1
51211 4 mi54 min 80°F3 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi54 min E 9.9 G 12 78°F 81°F1016 hPa
51210 14 mi54 min 79°F5 ft
51212 14 mi54 min 81°F4 ft
51202 - Mokapu Point, HI (098) 14 mi50 min 80°F6 ft
51207 15 mi30 min 79°F5 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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E2
NE2
G5
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N5
G9
NE3
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SE1
G5
E4
G8
NE5
G10
NE8
G15
NE8
G14
NE7
G13
E6
G17
NE8
G11
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G10
NE4
G10
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G12
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G7
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NE4
G7
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G6
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G9
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G9
E3
G7
N4
G10
NE7
G16
E11
G17
NE7
G16
NE9
G16
NE6
G19
NE9
G19
NE12
G20
NE9
G20
NE6
G17
E5
G11
E1
G8
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G10
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G6
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NE4
G7
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G6
NE3
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G9
NE5
G10
E8
G12
NE9
G12
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G18
SE8
G14
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G14
NE4
G16
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G13
E6
G11
NE7
G11
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G10
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G13
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G9
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G13
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G8
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G8
E2

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI5 mi31 minNE 12 G 1710.00 miMostly Cloudy80°F72°F76%1015 hPa
Oahu, Kalaeloa Airport, HI10 mi31 minN 010.00 miOvercast78°F70°F76%1016.1 hPa
Kaneohe, Marine Corps Air Station, HI12 mi71 minENE 510.00 miOvercast79°F75°F90%1015.2 hPa
Wheeler Air Force Base / Oahu, HI15 mi28 minNNW 310.00 miOvercast75°F70°F87%1014.3 hPa

Wind History from HNL (wind in knots)
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Last 24hrNE8N6NE5NE4N3N4NE9N7NE12
G20
N11NE14
G18
NE12
G23
E10
G19
NE12NE13NE9
G19
E13NE9NE11
G15
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G18
NE7NE5NE12
G17
1 day agoNE13NE12
G16
NE8NE12NE8NE11NE9
G17
NE14NE15
G22
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G25
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G24
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NE10E6NE10N5E10N6
2 days agoNE9NE9E7NE9NE8NE6E6E8E11NE12
G18
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G21
NE14NE13
G19
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G16
NE13E15N8NE11NE13E9NE8NE13E11NE10

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
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Mon -- 12:44 AM HST     0.81 feet High Tide
Mon -- 02:47 AM HST     Moonset
Mon -- 06:01 AM HST     Sunrise
Mon -- 06:35 AM HST     0.00 feet Low Tide
Mon -- 02:09 PM HST     2.09 feet High Tide
Mon -- 04:14 PM HST     Moonrise
Mon -- 07:14 PM HST     Sunset
Mon -- 09:21 PM HST     0.42 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.80.70.60.40.2000.20.40.81.31.722.121.81.51.10.80.50.40.40.5

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Mon -- 02:46 AM HST     Moonset
Mon -- 05:51 AM HST     0.07 feet Low Tide
Mon -- 06:00 AM HST     Sunrise
Mon -- 01:14 PM HST     2.06 feet High Tide
Mon -- 04:14 PM HST     Moonrise
Mon -- 07:13 PM HST     Sunset
Mon -- 08:43 PM HST     0.47 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.80.60.40.30.10.10.20.40.81.21.61.92.121.81.51.20.90.60.50.50.50.7

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 (7,2,3,4)
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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.