Friday, July28, 2017 L-36.com


Marine Weather and Tides
Kahaluu, 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 6:02AMSunset 7:12PM Friday July 28, 2017 3:07 AM HST (13:07 UTC) Moonrise 11:14AMMoonset 11:24PM Illumination 24% 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- 936 Pm Hst Thu Jul 27 2017
Rest of tonight..Northeast winds 20 knots. Wind waves 4 feet. Isolated showers late in the evening, then scattered showers after midnight.
Friday..East winds 20 knots. Wind waves 4 feet. Scattered showers.
Friday night..East winds 20 knots. Wind waves 4 feet. Scattered showers.
Saturday..East winds 20 knots. Wind waves 4 feet. SWell east 3 feet. Isolated showers through the day.
Saturday night..East winds 20 knots. Wind waves 4 feet. SWell east 3 feet. Isolated showers in the evening, then scattered showers after midnight.
Sunday..East winds 20 knots. Wind waves 3 feet. SWell east 4 feet. Isolated showers through the day.
Sunday night..Northeast winds 20 knots. Wind waves 3 feet. SWell east 4 feet. Isolated showers.
Monday..East winds 20 knots. Wind waves 3 feet. SWell east 4 feet. Isolated showers.
Tuesday..East winds 20 knots. Wind waves 4 feet. SWell east 4 feet. Isolated showers.
PHZ100 936 Pm Hst Thu Jul 27 2017
Synopsis for hawaiian coastal waters.. Surface high pressure far northeast of the aloha state will maintain trade winds through early next week.

7 Day Forecast for Marine Location Near Kahaluu, HI
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location: 21.46, -157.8     debug


Area Discussion for -
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Fxhw60 phfo 280648
afdhfo
area forecast discussion
national weather service honolulu hi
848 pm hst Thu jul 27 2017

Synopsis
Moisture associated with the remnants of greg will bring
increased humidity and more showery weather beginning later
tonight, some of which may be heavy on Friday. Most of the showers
will affect windward areas, but showers will also reach leeward
sections of the smaller islands, while leeward big island slopes
could see a few afternoon downpours over the next couple of days.

A trend toward drier trade wind weather is expected Saturday and
Saturday night, with more typical trade wind weather then
continuing through the middle of next week. High pressure north
of the state will drive primarily moderate trade winds for the
next week.

Discussion
Currently at the surface, the remnant trough of former tropical
cyclone greg is located around 450 miles east-southeast of hilo.

Meanwhile, a 1027 mb high centered around 1500 miles northeast of
honolulu, continues to drive moderate trade winds across the
island chain this evening. Infrared satellite imagery shows partly
to mostly cloudy skies moving into windward areas, with partly
cloudy skies across leeward sections of molokai, oahu and kauai.

Over maui and the big island, jet stream cirrus is resulting in
mostly cloudy conditions. Radar imagery shows scattered showers
moving into windward areas with the trades, with a few of these
showers drifting into leeward areas as well. Main short term
concern revolves around the potential for heavy rain over the next
day or two as the remnants of greg pass just to the south of the
island chain.

Rest of tonight,
the airmass this evening remains relatively dry with mimic total
precipitable water (pw) imagery indicating values of around 1.1
to 1.3 inches across the state. Just upstream of the islands
however, pw values increase above 1.5 inches, with values up to 2
inches around 200 miles east of hilo. The airmass will continue
to moisten up overnight as these higher pw values begin to
overspread the island chain. Shower activity is expected to
remain fairly scattered through the evening, but we should see an
increase in shower coverage after midnight, with some locally
heavy showers possibly moving into windward areas, particularly on
the big island, toward morning.

Friday and Friday night,
showery weather is expected across much of the state as pw values
increase into the 1.7 to 2.1 inch range, highest over the eastern
end of the island chain. Aloft, an upper level disturbance
overhead will act to erode the inversion over much of the area,
allowing the depth of deep moisture to increase significantly. As
a result, some of the shower activity could be heavy, particularly
over windward areas. With the trade winds expected to continue at
moderate levels, the threat for flash flooding does not appear
high enough to warrant the issuance of a flash flood watch at this
time. We will re-evaluate this once the 12z soundings have
arrived as this will give a better indication of the threat for
flash flooding. Conditions will become quite humid across the area
as well, with dewpoints rising into the lower 70s in most areas.

Moderate trade winds will prevail, with showers most frequent
over windward areas. Showers will reach leeward areas more
regularly however, given the higher moisture depth and prevailing
trade wind flow.

Saturday and Saturday night,
the plume of higher pw air will continue to affect the big island
through the day on Saturday, but a drying trend is expected across
the smaller islands by Saturday afternoon. Conditions are then
expected to begin drying out and stabilizing over the big island
Saturday night. As a result, we will likely continue to see
showery trade wind weather affecting windward areas of all islands
through Saturday morning, with the shower coverage dropping off
across the smaller islands Saturday afternoon and Saturday night.

Across the big island, wet conditions are expected to continue
for windward areas through the day on Saturday, with localized
downpours also affecting leeward slopes. Shower coverage should
begin to decrease across the big island Saturday night as the
drier more stable airmass works its way in. Showers will continue
to favor windward areas through the period, with a stray shower
reaching leeward areas of the smaller islands from time to time.

Moderate trade winds are expected to prevail.

Sunday through next Thursday,
a dry and stable trade wind pattern is expected Sunday through
Monday, with lower than normal shower coverage. A more typical
trade wind pattern will then return Monday through late next week
as the airmass moistens up. Showers will continue to favor
windward and mauka areas through the period, with a stray shower
reaching leeward locales mainly during the overnight and early
morning hours.

Aviation
A high pressure center far north of the hawaiian islands will keep
moderate strength northeasterly tradewinds in the forecast.

Remnant moisture from former tropical cyclone greg will move into
the islands early Friday morning with increasing showers and
periods of MVFR conditions expected, especially over north and
eastern slopes of all islands. The big island eastern slopes are
forecast to be MVFR ceilings in showers most of the day. Scattered
showers with more isolated MVFR conditions are forecast
elsewhere.

No airmets are in effect. Airmet sierra for mountain obscurations
are likely by Friday morning.

Marine
Surface high pressure far northeast of the islands will maintain
moderate trade winds during the next several days. The latest
forecast continues to indicate trade wind speeds will remain
below the small craft advisory threshold over the typically windy
waters adjacent to the islands of maui county and the big island
into early next week. Note that an area of enhanced tropical
moisture associated with former tropical cyclone greg is expected
to move into the islands from the east starting early Friday.

Although we do not anticipate any major change to our typical
trade wind weather conditions, mariners should expect to see an
increase in low clouds and showers over some parts of the coastal
waters from Friday into this weekend.

The moderate trade winds will keep moderate choppy surf along
along east facing shores of most islands into early next week. In
addition, the wave model guidance continues to indicate mid- to
long period east swells from distant east pacific tropical
cyclones irwin and hillary may arrive in the islands starting this
weekend. Once they arrive, these swells will need to be monitored
into the middle of next week for more specific details on the
timing and resultant surf heights along east facing shores. In
addition, we will also need to determine if this swell combined
with the trade wind waves might produce surf approaching the high
surf advisory criteria along some windward shorelines.

A small mid- to long period west swell produced by distant
typhoon in the west pacific is expected to spread across the area
from Friday into this weekend. Therefore, some exposed west
facing shores could see a small bump in surf. However, niihau and
kauai will likely block much of this swell energy from the west
facing shores of the remaining islands.

Elsewhere, a series of small mid- to long period south, southeast
and southwest swells will produce small background surf along most
south facing shores through the middle of next week.

Hfo watches warnings advisories
None.

Discussion... Jelsema
aviation... Bohlin
marine... Houston


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 2 mi92 min E 6 G 9.9 80°F 82°F1015.3 hPa
51207 3 mi43 min 79°F4 ft
51210 3 mi38 min 80°F4 ft
51202 - Mokapu Point, HI (098) 7 mi64 min 80°F5 ft
OOUH1 - 1612340 - Honolulu, HI 11 mi56 min NNE 1.9 G 5.1 77°F 81°F1015.7 hPa
51211 14 mi68 min 81°F2 ft
51201 - Waimea Bay, HI (106) 22 mi36 min 79°F4 ft

Wind History for Mokuoloe, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE10
E13
E10
G14
E11
G14
E9
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NE9
G12
NE12
G15
NE11
G15
NE14
G18
NE10
G15
NE11
G15
NE10
G14
NE12
G15
NE12
G15
NE12
NE9
G13
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G12
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1 day
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E10
G16
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E5
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G14
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G12
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G17
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G21
E14
G18
E14
G18
NE12
G17
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G17
E11
G18
E10
G14
E9
G16
NE13
G16
NE13
G16
NE13
G16
E13
G16
NE11
G16
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G15
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G12
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E9
G13
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G14
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G18
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G20
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G17
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G21
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G17
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E12
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G15
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G23
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G18
E7
G11
E12
G15
E9
G12
E8
G12
E9
G12
E12
G16

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kaneohe, Marine Corps Air Station, HI2 mi2.2 hrsENE 77.00 miMostly Cloudy79°F70°F74%1014.1 hPa
Honolulu, Honolulu International Airport, HI10 mi75 minNE 710.00 miMostly Cloudy78°F68°F71%1015 hPa
Wheeler Air Force Base / Oahu, HI12 mi70 minN 010.00 miOvercast73°F67°F82%1014 hPa
Oahu, Kalaeloa Airport, HI17 mi75 minENE 410.00 miMostly Cloudy77°F66°F69%1016 hPa

Wind History from HNG (wind in knots)
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Last 24hrE10
G16
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NE8
G15
NE10NE8
G16
NE8NE7NE7NE9NE10
G18
NE11NE10NE11NE7NE5NE8NE10NE9NE10NE6E5E7E8E7
1 day agoE12
G20
E10
G21
E9E7E85E12
G20
E12
G22
NE11
G20
NE9
G16
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G15
E10
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2 days agoE6E6E9
G15
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G16
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NE11
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E9E7
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G25
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G19
NE10
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E12E6E9
G15
E8
G22

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Fri -- 02:17 AM HST     0.10 feet Low Tide
Fri -- 06:03 AM HST     Sunrise
Fri -- 08:42 AM HST     1.22 feet High Tide
Fri -- 11:13 AM HST     Moonrise
Fri -- 01:55 PM HST     0.66 feet Low Tide
Fri -- 07:11 PM HST     Sunset
Fri -- 07:57 PM HST     1.50 feet High Tide
Fri -- 11:24 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.20.10.10.30.60.81.11.21.21.110.80.70.70.70.91.11.31.41.51.41.21

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Fri -- 01:33 AM HST     0.16 feet Low Tide
Fri -- 06:02 AM HST     Sunrise
Fri -- 07:45 AM HST     1.23 feet High Tide
Fri -- 11:12 AM HST     Moonrise
Fri -- 01:11 PM HST     0.70 feet Low Tide
Fri -- 06:59 PM HST     1.49 feet High Tide
Fri -- 07:11 PM HST     Sunset
Fri -- 11:23 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.20.20.30.50.81.11.21.21.210.90.80.70.70.91.11.31.41.51.41.310.7

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 (9,2,3,4)
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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.