Friday, December15, 2017 L-36.com


Marine Weather and Tides
Urban Honolulu, 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 7:00AMSunset 5:53PM Friday December 15, 2017 4:08 AM HST (14:08 UTC) Moonrise 4:52AMMoonset 4:24PM Illumination 8% Phase: Waning Crescent; Moon at 27 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- 314 Am Hst Fri Dec 15 2017
.small craft advisory in effect through late this afternoon...
Today..Northeast winds to 25 knots. Wind waves 8 feet. Northwest swell 8 feet. Scattered heavy showers through the day. Slight chance of Thunderstorms in the afternoon.
Tonight..Northeast winds 20 knots. Wind waves 6 feet. North swell 7 feet. Heavy showers likely.
Saturday..Winds variable less than 10 knots. Wind waves 5 feet. North swell 6 feet. Scattered heavy showers through the day. Chance of Thunderstorms in the afternoon.
Saturday night..Winds variable less than 10 knots becoming south 10 knots after midnight. Wind waves 5 feet. North swell 5 feet. Scattered heavy showers.
Sunday..South winds 10 knots. Wind waves 5 feet. Northwest swell 5 feet. Scattered heavy showers.
Sunday night..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 feet. Isolated showers.
Monday..Winds variable less than 10 knots. Wind waves 4 feet. Northwest swell 5 to 6 feet. Scattered showers.
Tuesday..Winds variable less than 10 knots becoming north 10 knots after midnight. Wind waves 3 feet. North swell 6 to 8 feet. Scattered showers.
PHZ100 314 Am Hst Fri Dec 15 2017
Synopsis for hawaiian coastal waters.. Northwest swell will continue to subside through Saturday. Strong northeast winds today will also subside tonight into the weekend as a low pressure trough moves westward over the state.

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 151407
afdhfo
area forecast discussion
national weather service honolulu hi
407 am hst Fri dec 15 2017

Synopsis
Breezy north to northeast winds will continue today, but the
winds will weaken from tonight into the weekend. An upper level
low and increasing moisture will bring unsettled weather to
portions of the state through this weekend. As a result, rain
chances will increase, with locally heavy downpours possible and a
slight chance of thunderstorms. Widespread rainfall is possible
early next week as an upper-level trough pushes toward the islands
from the northwest.

Discussion
A 1033 mb surface high is near 42n 138w, or about 1800 miles
northeast of honolulu. A surface ridge extends southwest from this
high through a point approximately 600 miles north of kauai.

Elsewhere, a north to south oriented surface trough, which is
moving slowly westward, is evident about 320 miles east of hilo.

The tight pressure gradient between these features is maintaining
locally breezy north to northeast winds across the state. A wind
advisory remains in effect for the big island summits this
morning, but the wind advisory has been cancelled for all lower
elevations. Note that the breezy conditions combined with low dew
points continue to make sensible temperatures feel relatively cool
this morning.

Aloft, middle- and upper-tropospheric lows are located nearly 280
miles northeast of hilo. The surface trough described above is a
reflection of these features, which are propagating slowly toward
the west-southwest. The close proximity of the lows appears to
have already destabilized the atmosphere over the eastern end of
the state. The early morning hilo balloon sounding shows no
significant low-level inversion. Satellite imagery and radar
reflectivity data indicate mainly broken low clouds with embedded
scattered showers moving down from the north and northeast toward
the windward and north facing sides of most islands east of oahu.

Significant changes will continue to develop in weather
conditions across the islands today. The upper level lows, as
well as the surface trough, will continue to approach the islands.

As a result, the north to northeast winds will gradually weaken
from later today through tonight.

The upper lows are expected to reach a position just northeast of
the islands on Saturday, and then slowly pull away toward the
northeast on Sunday. By Saturday, with the surface trough in the
vicinity of the islands, the background flow will become light and
variable across most areas. This will allow the development of
local afternoon sea breezes. By Sunday, the surface trough is
forecast to be located west of the state, with light southerly
winds gradually spreading from east to west across the area.

The cooler temperatures aloft associated with the middle and
upper-level lows will be close enough to continue destabilizing
the atmosphere today, especially over the eastern end of the
island chain. In addition, increasing moisture will move in to the
islands as the surface trough approaches the state. This will
likely usher in an extended period of unsettled weather across the
region, with increasing chances for rainfall, and the possibility
of locally heavy downpours and isolated thunderstorms. In
addition, there is a chance of rain mixed with snow on the big
island summits.

The current forecast continues to favor the eastern half of the
state for the heavier rainfall. There is a slight chance of
thunderstorms this afternoon due to the instability aloft. By
Saturday afternoon, daytime heating and local sea breezes may
provide additional support for deep convection.

Widespread showers are becoming a distinct possibility early next
week as an upper-level trough digs down toward the islands from
the northwest, and deep tropical moisture pushes up from the
southeast. In addition, a couple of cold fronts may sweep across
the islands from the northwest later in the week, which may result
in an extended period of northwest winds.

Aviation
A strong and gusty north-northeast flow will gradually decrease
later this afternoon and evening as a developing cutoff low
drifts westward toward the state. The upper level low will drift
over the islands by afternoon enhancing showers significantly across
the islands with increasing coverage for MVFR in shra favoring
north through east slopes of all islands. Isolated thunderstorms
are possible through Saturday afternoon.

Wind speeds will remain strong enough for tempo moderate low
level turbulence will occur over and downwind of mountain ranges
through the afternoon hours. Wind speeds will diminish below
turbulence criteria around sunset tonight. Airmet tango for
moderate low level turbulence remains in effect until Saturday
04z.

Marine
Northwest swell continues to slowly decline at the nearshore
pacioos buoys, but has dropped off quickly during the past several
hours at offshore buoy 51101. We have dropped the high surf
advisory for north and west facing shores. Surf on those shores
will continue to gradually decline today.

Strong northeast winds are expected to produce advisory level surf
on east facing shores today and tonight, and we have issued a high
surf advisory for those areas. These winds will drop off quickly
late tonight and Saturday, but the residual swell will cause surf
along east facing shores to subside more slowly.

Strong northeast winds will continue across much of the area
today, and combined with the lingering swell will produce small
craft advisory (sca) conditions across most zones. The SCA was
previously extended for most of the area through this afternoon.

We have now replaced the previous gale warning with a SCA for the
alenuihaha channel as well. Winds and seas will gradually subside
this afternoon and tonight into the weekend, with conditions
expected to be below SCA criteria for all waters Saturday through
Monday.

Heavy showers and isolated thunderstorms will be possible across
parts of the coastal waters today through at least Saturday due
to a nearby upper level trough.

See the collaborative nearshore swell and wind forecast for
details on expected swell and resulting surf.

Hfo watches warnings advisories
High surf advisory until 6 am hst Saturday for east facing shores
of kauai, oahu, molokai, maui and the big island.

Wind advisory until noon hst today for the big island summits.

Small craft advisory until 6 pm hst this evening for all hawaiian
waters, except the big island southeast waters.

Discussion... Houston
aviation... Bohlin
marine... Jacobson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi57 min NE 5.1 G 13 69°F 76°F1015.9 hPa
51211 4 mi69 min 77°F2 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi93 min NE 16 G 21 71°F 73°F1015.9 hPa
51210 14 mi39 min 76°F9 ft
51202 - Mokapu Point, HI (098) 14 mi65 min 76°F11 ft
51201 - Waimea Bay, HI (106) 29 mi37 min 74°F11 ft

Wind History for Honolulu, HI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE6
G12
NE6
G10
NE7
G11
NE4
G18
NE7
G13
NE7
G16
NE12
G19
NE10
G18
NE7
G15
NE13
G19
NE8
G22
NE10
G14
NE11
G18
NE10
G19
NE7
G13
NE9
G16
NE8
G14
NE11
G16
NE6
G10
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G12
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G19
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NE6
G16
NE3
G11
1 day
ago
NW2
N2
NW5
G9
NW4
G8
N5
N5
G9
N8
G13
NE6
G16
N6
G14
NE9
G14
NE6
G13
NW7
G12
N7
G11
NE3
G7
N4
G10
SE1
G4
NW3
G7
NE4
G10
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NE6
G11
NE2
G7
N3
G18
NE5
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E2
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2 days
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SW9
G12
W7
G10
W9
SW8
G12
SW7
G10
SW9
G13
SW11
SW9
G12
NW12
G16
SW7
G10
W6
NW4
G8
NW8
G14
N4
N3
NE2
NE1
N1
NE1
N2
NW3
N1
N4

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Honolulu, Honolulu International Airport, HI5 mi76 minNE 1210.00 miMostly Cloudy71°F50°F47%1015.3 hPa
Oahu, Kalaeloa Airport, HI10 mi76 minVar 310.00 miPartly Cloudy64°F55°F75%1016.4 hPa
Kaneohe, Marine Corps Air Station, HI12 mi2.2 hrsNE 17 G 3010.00 miMostly Cloudy71°F53°F53%1015.1 hPa
Wheeler Air Force Base / Oahu, HI15 mi73 minN 8 G 1510.00 miMostly Cloudy65°F52°F66%1015.9 hPa

Wind History from HNL (wind in knots)
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Last 24hrNE7NE11NE10
G21
NE12N10NE8
G17
N13
G22
N11
G21
N9
G20
NE16
G24
NE9
G18
NE13
G22
N9
G16
NE8
G21
NE13NE11N8
G16
NE8
G17
NE9NE8N7
G18
NE8NE12NE6
1 day agoNW5CalmN4NW4N4N10N10NE12NE13
G19
NE13
G18
NE12NE14
G19
N7
G17
N8N6N6N3N13
G20
N3N10N11N13
G19
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NE9
2 days agoSW10SW11SW10SW12SW9SW11SW12SW15W12W13W7N12
G20
NW13N8N7N5N4NE3N5NW5NW6NW4NW5NW3

Tide / Current Tables for Honolulu, Honolulu Harbor, Oahu Island, Hawaii
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Honolulu
Click for Map
Fri -- 02:45 AM HST     2.10 feet High Tide
Fri -- 04:51 AM HST     Moonrise
Fri -- 07:01 AM HST     Sunrise
Fri -- 09:35 AM HST     0.42 feet Low Tide
Fri -- 02:07 PM HST     0.92 feet High Tide
Fri -- 04:24 PM HST     Moonset
Fri -- 05:52 PM HST     Sunset
Fri -- 07:56 PM HST     -0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.822.121.71.30.90.60.40.40.50.70.80.90.90.70.40.2-0-0.1-00.30.7

Tide / Current Tables for Hanauma Bay, Oahu Island, Hawaii
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Hanauma Bay
Click for Map
Fri -- 01:48 AM HST     2.05 feet High Tide
Fri -- 04:50 AM HST     Moonrise
Fri -- 07:00 AM HST     Sunrise
Fri -- 08:54 AM HST     0.47 feet Low Tide
Fri -- 01:10 PM HST     0.92 feet High Tide
Fri -- 04:24 PM HST     Moonset
Fri -- 05:51 PM HST     Sunset
Fri -- 07:12 PM HST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.7221.91.71.310.70.50.50.50.70.80.90.90.70.50.30.1-000.30.71.1

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 (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.