Thursday, January21, 2021
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Marine Weather and Tides
Heeia, HI

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:09AMSunset 6:15PM Thursday January 21, 2021 6:02 PM HST (04:02 UTC) Moonrise 12:54PMMoonset 1:11AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 331 Pm Hst Thu Jan 21 2021
.small craft advisory in effect through Sunday afternoon...
Tonight..East winds to 25 knots. Wind waves 6 feet. North swell 4 feet. Isolated showers in the evening. Scattered showers after midnight.
Friday..East winds to 25 knots. Wind waves 7 feet. North swell 4 feet. Isolated showers.
Friday night..East winds to 25 knots. Wind waves 8 feet. North swell 6 feet increasing to northwest 8 feet after midnight. Scattered showers.
Saturday..East winds to 25 knots. Wind waves 9 feet. Northwest swell 9 feet. Scattered showers.
Saturday night..East winds to 25 knots. Wind waves 10 feet. Northwest swell 9 feet. Scattered showers.
Sunday..East winds to 25 knots. Wind waves 11 feet. Northwest swell 7 feet. Scattered showers.
Sunday night..East winds to 30 knots. Wind waves 11 feet. Northwest swell 6 feet. Scattered showers.
Monday..East winds to 30 knots. Wind waves 11 to 13 feet. North swell 3 to 5 feet. Scattered showers.
Tuesday..East winds to 25 knots. Wind waves 11 feet. North swell 3 feet. Scattered showers.
PHZ100 331 Pm Hst Thu Jan 21 2021
Synopsis for hawaiian coastal waters.. High pressure far northeast will support moderate to locally strong trade winds over the next couple of days. The high will strengthen over the weekend and on into early next week with trade winds become stronger across the area.


7 Day Forecast for Marine Location Near Heeia, HI
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location: 21.44, -157.81     debug


Area Discussion for -
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FXHW60 PHFO 220202 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 402 PM HST Thu Jan 21 2021

SYNOPSIS. Trade winds will strengthen as high pressure builds northeast of the state. Showers will favor windward slopes, with a few heavy showers possible this weekend and early next week as an upper trough lingers across the islands. Meanwhile, trade winds will shift out of the east to east-southeast and become breezy and gusty.

DISCUSSION. Water vapor imagery shows an upper trough over the state late this afternoon. Associated high clouds are streaming up from the southwest over the Big Island. 00Z soundings show stable mid-layers with relatively cool 500 mb temperatures around -11 C which contributed to some of the locally heavy showers passing through today.

At the surface, a 1034 mb high is centered far northeast will drive fresh trade winds across the state tonight. The trades will carry in low clouds and showers that will focus over windward and mauka areas this evening. Showers will trend down for the smaller islands later tonight as upstream moisture appears limited and guidance shows drier air building in. Showers will linger through the night into Friday morning for windward Big Island. Overall shower coverage should decrease by Friday.

High pressure will continue to build into the weekend resulting in winds becoming fresh to strong. Another upper trough will induce a high amplitude surface trough about 500 miles west of the main Hawaiian Islands which will result in our winds veering east southeasterly this weekend. Temperatures aloft will remain cold, but will likely have limited influence Friday and Saturday due to the midlevel inversion and less moisture to work with.

Deeper moisture from the southeast will begin to move up from the south on Sunday into the middle of next week with the strong east southeast winds continuing. This will likely result in an increase in clouds and showers statewide, particularly across windward and southeast slopes. In addition to the shower increase, layered mid and high clouds will keep cloudy skies in the forecast for most of the state much of next week.

AVIATION. A strong surface high will remain far northeast of the area over the next couple of days. This will produce locally strong east winds over the main Hawaiian Islands over the next 24 hours. These low level winds will carry some clouds and showers over eastern sections of the islands, especially during the night and early morning hours. These clouds and showers may produce localized MVFR ceilings and visibilities at times.

Airmet Sierra remains in effect for northeast Big Island this afternoon for mountain obscuration from a widespread MVFR level cloud deck. However, these clouds are expected to begin breaking up over the next few hours.

Airmet Tango remains in effect for moderate turbulence over and southwest through west of the mountains of all islands. Strong surface winds are expected to continue over the next several days.

MARINE. A 1034 mb surface high is centered far to the north northeast of the area. This is resulting in moderate to locally strong trade winds. A Small Craft Advisory (SCA) is currently posted for the typically windy waters around Oahu, Maui County and the Big Island. The high will get a reenforcement over the weekend and on into early next week strengthening to around 1044 mb. The result will be for trade winds to increase across the entire area. This combined with higher seas from both a large northwest swell and the trade winds generated seas, will result in SCA criteria being met across the entire area.

A small northwest swell will linger through the day Friday. Long period forerunners from a larger northwest swell will fill in late Friday and Friday night. This swell is expected to peak on Saturday with high end advisory or low end warning level surf expected. The direction of this swell is from 310 degrees and the primary period during its peak will be around 18 seconds. This swell will then lower gradually Sunday and Monday.

Model guidance indicates surf will become rather small for this time of year along most north and west facing shores Tuesday and Wednesday.

Meanwhile, high pressure will be strengthening north of the area resulting in rather robust trade winds by this weekend and on into early next week. Short period choppy surf will gradually rise and a High Surf Advisory will likely posted and remain in effect for several days.

Small, mainly background southerly swells are expected over the next several days. A slightly larger south southwest swell from the Tasman sea is expected to gradually fill in on Monday, peak Monday night and Tuesday, then lower gradually Wednesday through Thursday.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 PM HST Sunday for Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Foster AVIATION . Donaldson/Vaughan MARINE . Burke


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MOKH1 - 1612480 - Mokuoloe, HI 1 mi86 min E 15 G 20 76°F 1015.9 hPa
51207 4 mi66 min 77°F8 ft
51210 4 mi66 min 77°F8 ft
51202 - Mokapu Point, HI (098) 7 mi66 min 77°F9 ft
OOUH1 - 1612340 - Honolulu, HI 10 mi68 min ENE 6 G 17 77°F 78°F1015.7 hPa
51211 13 mi62 min 78°F3 ft
51212 20 mi66 min 78°F3 ft
51201 - Waimea Bay, HI (106) 23 mi55 min 77°F6 ft

Wind History for Mokuoloe, HI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI9 mi69 minENE 18 G 2510.00 miPartly Cloudy and Breezy79°F62°F56%1015.3 hPa
Oahu, Kalaeloa Airport, HI16 mi69 minE 8 G 1610.00 miFair79°F64°F60%1016.2 hPa

Link to 5 minute data for PHNG

Wind History from HNG (wind in knots)
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NE10NE13NE12N13N11--NE12E6E6E7E8E7E6E6E7E8E6E7E7E9E9
1 day agoN22
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2 days agoCalmW8S4SW44S4SW9SW9SW11CalmN11
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N15N11N14N15N14N14N9N18N18
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Tide / Current Tables for Waikane, Kaneohe Bay, Oahu Island, Hawaii
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Waikane
Click for Map
Thu -- 01:11 AM HST     Moonset
Thu -- 04:53 AM HST     1.03 feet Low Tide
Thu -- 07:11 AM HST     Sunrise
Thu -- 07:53 AM HST     1.23 feet High Tide
Thu -- 12:53 PM HST     Moonrise
Thu -- 03:21 PM HST     0.37 feet Low Tide
Thu -- 06:14 PM HST     Sunset
Thu -- 10:47 PM HST     1.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.41.21.1111.11.21.21.21.110.80.60.50.40.40.50.81.11.41.71.91.9

Tide / Current Tables for Moku o Loe, Kaneohe Bay Oahu Island, Hawaii
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Moku o Loe
Click for Map
Thu -- 01:11 AM HST     Moonset
Thu -- 04:57 AM HST     1.03 feet Low Tide
Thu -- 07:11 AM HST     Sunrise
Thu -- 08:15 AM HST     1.03 feet High Tide
Thu -- 12:54 PM HST     Moonrise
Thu -- 03:25 PM HST     0.37 feet Low Tide
Thu -- 06:14 PM HST     Sunset
Thu -- 11:09 PM HST     1.70 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.31.21.111111110.90.70.60.40.40.40.50.70.91.21.51.61.7

Weather Map
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wmap_P
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station




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