Sunday, September20, 2020
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Marine Weather and Tides
Urban Honolulu, 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 6:18AMSunset 6:30PM Sunday September 20, 2020 12:14 AM HST (10:14 UTC) Moonrise 9:49AMMoonset 9:27PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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- 917 Pm Hst Sat Sep 19 2020
Rest of tonight..Northeast winds 15 knots. Wind waves 5 feet. Mixed swell south 3 feet and north 3 feet. Isolated showers.
Sunday..East winds 15 knots. Wind waves 4 feet. Mixed swell south 3 feet and north 3 feet. Isolated showers in the morning.
Sunday night..East winds 20 knots. Wind waves 4 feet. Southwest swell 3 feet in the evening. SWell north 3 feet. Isolated showers after midnight.
Monday..Northeast winds 15 knots. Wind waves 4 feet. SWell north 3 feet. Isolated showers in the morning.
Monday night..East winds 15 knots. Wind waves 4 feet. SWell north 3 feet. Isolated showers after midnight.
Tuesday..East winds 20 knots. Wind waves 4 feet. Isolated showers in the morning.
Tuesday night..East winds 15 knots. Wind waves 4 feet. Isolated showers after midnight.
Wednesday..East winds 20 knots. Wind waves 4 feet. SWell north 3 to 5 feet. Isolated showers.
Thursday..Northeast winds 20 knots. Wind waves 5 feet. SWell north 5 to 6 feet. Isolated showers.
PHZ100 917 Pm Hst Sat Sep 19 2020
Synopsis for hawaiian coastal waters.. A ridge of high pressure north of the state will keep generally moderate to fresh trades in place through late next week. Locally strong winds are expected over the typically windy waters around maui and the big island through the weekend.


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 200640 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 840 PM HST Sat Sep 19 2020

SYNOPSIS. A modest increase in moisture moving into the islands from the east will support better windward shower coverage into Sunday, with some light showers potentially reaching our parched leeward areas of the smaller islands. The best chance for this enhanced activity will be through the overnight and early morning hours. A return of drier air is anticipated Sunday night through the first half of the week, which will limit windward shower coverage. Moderate to locally breezy trade winds will relax slightly by midweek as high pressure weakens to the north.

DISCUSSION. Latest surface analysis and satellite imagery showed the subtropical ridge anchored north of the islands and a band of low- level clouds moving into the area. Satellite-derived precipitable water (PW) imagery and the Kauai upper-air sounding reflected this band of shallow moisture in the area with values ranging from 1.5 to 1.75 inches. After a very dry period over the past several days, this increase in moisture will support better trade wind shower coverage overnight into Sunday, especially for the western end of the state. A few of these showers, mostly light, may spill over into leeward areas periodically through this time. Accumulations, however, should remain on the light side. The latest rainfall summary across the state showed peak 24-hr totals just above three quarters of an inch from a few gauges on Kauai. Elsewhere, accumulations have remained under a quarter of an inch through this time.

Guidance has initialized well with the current pattern and shows this band of higher moisture remaining in the area as late as Sunday night. Although accumulations will remain light due to the stable conditions in place, better trade wind shower coverage is expected through Sunday, especially for the western end of the state. A return of dry and stable conditions are expected Monday through midweek as this area of moisture shifts west of the area. Locally breezy trade winds are expected to ease slightly Monday through midweek as high pressure weakens to the north.

AVIATION. A high pressure ridge north of the islands will keep moderate to locally breezy trade winds in the forecast for one more day. A band of unstable clouds will drift through the islands tonight through tomorrow morning bringing periods of scattered showers mainly to windward and mountain areas. The stronger showers will produce passing MVFR conditions through the early morning hours. Tempo Mountain Obscurations may be expanded to other islands as these unstable shower bands roll in.

AIRMET for Tempo Mountain Obscuration in effect for the north and east sections of Kauai. This AIRMET may be expanded to other islands later this morning.

MARINE. A ridge of high pressure north of the state will keep a general moderate to fresh trade wind flow in place through late next week, with only minor fluctuations in strength. Locally strong winds are expected in the typically windy areas around Maui and the Big Island through Sunday night, and as a result, a Small Craft Advisory (SCA) remains in effect for these areas.

A series of long-period south-southwest swells will keep south shore surf pumping through late next week, with surf expected to remain above the summertime average during this time. The current northwest swell will keep some small surf moving into north and west facing shores through the weekend, before declining early next week. A moderate size long-period north-northwest swell, the most significant of the early fall season, is expected to build Tuesday night and Wednesday, bringing a noticeable increase in surf to north facing shores. This swell will peak Wednesday night and Thursday, with a gradual decline through late next week. East shore surf will remain below the summertime average through the next week.

HFO WATCHES/WARNINGS/ADVISORIES. Small Craft Advisory until 6 AM HST Monday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.



DISCUSSION . Gibbs AVIATION . Bohlin MARINE . Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
OOUH1 - 1612340 - Honolulu, HI 1 mi62 min ENE 2.9 G 8 79°F 81°F1017.9 hPa
51211 4 mi44 min 81°F3 ft
MOKH1 - 1612480 - Mokuoloe, HI 11 mi98 min E 5.1 G 9.9 79°F 83°F1018.1 hPa
51202 - Mokapu Point, HI (098) 14 mi48 min 81°F6 ft
51210 14 mi48 min 81°F5 ft
51212 14 mi48 min 82°F4 ft
51207 15 mi48 min 81°F5 ft

Wind History for Honolulu, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Daniel K Inouye International Airport, HI5 mi21 minNE 1210.00 miPartly Cloudy79°F69°F72%1017.3 hPa
Oahu, Kalaeloa Airport, HI10 mi21 minVar 410.00 miOvercast78°F70°F76%1018.2 hPa
Kaneohe, Marine Corps Air Station, HI12 mi77 minE 1010.00 miMostly Cloudy80°F68°F67%1016.7 hPa
Wheeler Air Force Base / Oahu, HI15 mi78 minN 010.00 miOvercast74°F68°F85%1017 hPa

Link to 5 minute data for PHNL

Wind History from HNL (wind in knots)
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1 day agoE13
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Tide / Current Tables for Honolulu, Oahu (Hawaii)
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Honolulu
Click for Map
Sun -- 06:19 AM HST     Sunrise
Sun -- 06:29 AM HST     2.02 feet High Tide
Sun -- 09:49 AM HST     Moonrise
Sun -- 12:56 PM HST     0.52 feet Low Tide
Sun -- 06:13 PM HST     1.32 feet High Tide
Sun -- 06:28 PM HST     Sunset
Sun -- 09:26 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.30.611.51.8221.81.51.10.80.60.50.60.811.21.31.31.10.80.50.3

Tide / Current Tables for Waimanalo, Oahu Island, Hawaii
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Waimanalo
Click for Map
Sun -- 05:14 AM HST     1.72 feet High Tide
Sun -- 06:19 AM HST     Sunrise
Sun -- 09:48 AM HST     Moonrise
Sun -- 11:47 AM HST     0.44 feet Low Tide
Sun -- 04:58 PM HST     1.12 feet High Tide
Sun -- 06:28 PM HST     Sunset
Sun -- 09:25 PM HST     Moonset
Sun -- 11:09 PM HST     0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.60.91.31.61.71.71.51.20.90.60.50.40.50.70.91.11.11.10.90.70.40.20.1

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 Molokai, HI
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weather_mapweather_map weather_map


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