Friday, September25, 2020
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Marine Weather and Tides
Wainaku, 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 6:08AMSunset 6:14PM Friday September 25, 2020 3:02 AM HST (13:02 UTC) Moonrise 2:34PMMoonset 12:50AM Illumination 58% Phase: Waxing Gibbous; Moon at 8 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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PHZ122 Big Island Windward Waters- 927 Pm Hst Thu Sep 24 2020
Rest of tonight..East winds 15 knots. Wind waves 4 feet. North swell 5 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 5 feet. North swell 5 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Friday night..East winds 20 knots. Wind waves 5 feet. North swell 5 feet. SWell south 3 feet. Isolated showers.
Saturday..East winds 15 knots. Wind waves 5 feet. Mixed swell north 4 feet and south 3 feet. Isolated showers in the morning.
Saturday night..East winds 15 knots. Wind waves 5 feet. Mixed swell north 4 feet and south 4 feet. Isolated showers.
Sunday..East winds 15 knots. Wind waves 5 feet. Mixed swell north 3 feet and south 3 feet. Isolated showers in the morning.
Sunday night..East winds 10 knots. Wind waves 4 feet. Mixed swell north 3 feet and south 3 feet.
Monday..Northeast winds 10 knots. Wind waves 5 feet. Mixed swell northeast 3 feet and south 3 feet.
Tuesday..East winds 10 knots. Wind waves 4 feet. Isolated showers.
PHZ100 927 Pm Hst Thu Sep 24 2020
Synopsis for hawaiian coastal waters.. Ridge of high pressure will remain north of the islands through Saturday, then weaken Sunday into next week as a series of fronts pass to the north.


7 Day Forecast for Marine Location Near Wainaku, HI
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location: 19.73, -155.06     debug


Area Discussion for -
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FXHW60 PHFO 250639 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 839 PM HST Thu Sep 24 2020

SYNOPSIS. Fairly typical trade wind weather is expected through Saturday, with showers favoring windward and mauka areas and a stray shower spilling leeward from time to time. The trades will become light Sunday through Monday, with a few showers continuing to affect windward areas and a shower or two developing over leeward areas during the afternoon hours each day. A land breeze and sea breeze pattern is expected to take hold Tuesday through late next week, with limited to coastal areas at night and during the morning, and interior locations during the afternoon and evening hours.

DISCUSSION. Currently at the surface, a 1025 mb high is centered around 900 miles north-northeast of Honolulu, and is driving moderate to locally breezy trades across the island chain this evening. Meanwhile, Tropical Storm Lowell remains far to the east of the state, around 1700 miles east of Hilo, over the cooler east Pacific waters. Closer to home, infrared satellite imagery shows scattered to broken low clouds pushing into windward areas with the trades, with mostly clear skies in leeward areas, with the exception of leeward Big Island where some lingering daytime heating driven cloud cover remains. Radar imagery shows scattered showers moving into windward areas, as well as increasing trade showers upstream of the state. Leeward areas remain generally dry, although a few diminishing showers continue to hang on over leeward Big Island. Main short term concern revolves around trade wind trends and rain chances during the next few days.

High pressure north of the islands will keep moderate to breezy trades in place through Friday. The trades will then ease over the weekend as the high north of the state slides into the far east Pacific and a trough of low pressure develops north of the islands. A further easing of the trades is expected next week, as the remnant low of tropical cyclone Lowell approaches from the east, and a cold front approaches from the west. This is expected to drop trades into the light range Monday through late next week, with a sea breeze/land breeze pattern likely in leeward areas each day.

As for the day to day weather details, fairly typical trade wind conditions will prevail through Saturday. Showers will favor windward and mauka areas, particularly during the night and early morning hours, with a stray shower reaching leeward areas from time to time. Shower coverage is expected to be the greatest tonight, before becoming more sparse Friday into the weekend. The forecast becomes a bit more uncertain Sunday and Monday, as the ECMWF shows a band of moisture ahead of the remnants of Lowell pushing into the islands, while the GFS keeps this band of moisture northeast of the state. With the lightened wind regime anticipated, we should see showers limited to windward areas during the night and morning hours, with a few daytime heating and sea breeze driven showers possible in leeward areas. Tuesday through next Thursday, the trades will be largely cut off, and this should result in a fairly dry land breeze/sea breeze driven shower pattern. During this time, showers should favor coastal areas overnight and during the morning hours, and interior sections of the islands during the afternoon and evening.

AVIATION. Locally breezy trades will remain relatively dry through the forecast period. Prevailing VFR is forecast with only isolated/brief instances of MVFR expected within heavier windward and mauka showers, especially Maui and Big Island.

AIRMET Tango is in effect for tempo low-level turbulence over and south through west of the mountains of all islands. Conditions will likely continue well into Friday.

MARINE. Fresh to strong easterly trades will continue through Friday, then gradually trend down over the weekend, potentially enough for a localized land and sea breeze pattern to set up near the coasts beginning as early as Sunday. The Small Craft Advisory currently in place through the night will likely need to be extended through the day Friday for the windier waters around Maui County and the Big Island. Guidance shows the light winds holding through the first half of next week in response to a weakness developing in the ridge as a series of fronts pass to the north.

Surf along north facing shores peaked today due to the first sizable swell of the season arriving out of the north. The latest observations at the offshore buoys suggest this swell has peaked. Expect plenty of energy holding into Friday, before dropping off quickly through the weekend. The active pattern across the northern Pacific is forecast to continue over the weekend through early next week with back-to-back systems diving southeastward across the Date Line from the western Aleutians. If this scenario materializes, the first swell will arrive Wednesday and peak Thursday with the second one arriving Friday. The first of the two could approach the advisory level by Thursday.

Surf along south facing shores will remain up over the weekend as a new, long-period south-southwest swell arrives Friday from recent activity down south. Heights will near the advisory level (8 ft faces) by Saturday as it peaks. A gradual downward trend is expected Sunday into early next week. For the long range, the active trend is expected to continue down south around New Zealand within Hawaii's swell window. The latest guidance depicts a broad, storm-force low bottoming out at 929 mb south-southeast of New Zealand late this weekend. A large area of gale- to storm-force winds setting up within our swell window will drive seas into the 35 to 40 ft range. If this evolves as predicted, expect a large south swell by the end of the first week in October.

Surf along along east facing shores will remain small through the upcoming weekend. A small easterly swell from tropical cyclone Lowell in the eastern Pacific can't be ruled out early next week, especially for the eastern end of the state.

Water levels will gradually trend down each day through the last week of the month and into October.

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



DISCUSSION . Jelsema AVIATION . JVC MARINE . Gibbs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 0 mi45 min SSW 1.9 G 2.9 72°F 81°F1015.1 hPa
51206 6 mi50 min 80°F6 ft
KWHH1 46 mi45 min E 7 G 19 81°F 81°F1014.2 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilo, Hilo International Airport, HI1 mi70 minSW 410.00 miPartly Cloudy72°F66°F82%1016.9 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrW7W3W3SW3CalmNW6NE76N10N7N8N9N9N6N7N4N4W6S5SW5W7S6SW4SW4
1 day agoS3CalmW6CalmSW7SW5W6NW4S4S6E6E12E12SE94W6W7W7CalmW4SW4W5W6W5
2 days agoSW6SW5SW7CalmW3CalmE3N5CalmNE76E74NE8NE3CalmS5W5W3SW5N3W8SW4Calm

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Fri -- 12:50 AM HST     Moonset
Fri -- 03:29 AM HST     0.59 feet Low Tide
Fri -- 06:09 AM HST     Sunrise
Fri -- 11:06 AM HST     2.63 feet High Tide
Fri -- 02:34 PM HST     Moonrise
Fri -- 06:13 PM HST     Sunset
Fri -- 06:47 PM HST     0.45 feet Low Tide
Fri -- 11:58 PM HST     1.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.210.80.60.60.711.41.82.22.52.62.62.31.91.510.70.50.50.60.81.11.3

Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Fri -- 12:52 AM HST     Moonset
Fri -- 04:16 AM HST     0.35 feet Low Tide
Fri -- 06:12 AM HST     Sunrise
Fri -- 12:02 PM HST     2.07 feet High Tide
Fri -- 02:37 PM HST     Moonrise
Fri -- 06:16 PM HST     Sunset
Fri -- 07:38 PM HST     0.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.50.40.40.40.50.81.11.41.822.121.81.41.10.70.40.30.30.40.50.7

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 Kohala, HI
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