Wednesday, December11, 2019
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Marine Weather and Tides
Hanamaulu, HI

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:58AMSunset 5:52PM Wednesday December 11, 2019 4:43 PM HST (02:43 UTC) Moonrise 5:53PMMoonset 6:37AM Illumination 100% Phase: Full Moon; Moon at 15 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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PHZ111 Kauai Windward Waters- 338 Pm Hst Wed Dec 11 2019
.small craft advisory in effect through Thursday afternoon...
Tonight..East winds 10 knots. Wind waves 3 feet. Northwest swell 13 feet. Isolated showers through the night.
Thursday..Northeast winds 15 knots. Wind waves 3 feet. Northwest swell 12 feet. Scattered showers.
Thursday night..East winds 20 knots. Wind waves 5 feet. Northwest swell 10 feet. SWell northeast 3 to 4 feet. Showers likely.
Friday..East winds 20 knots. Wind waves 6 feet. Northwest swell 8 feet and northeast 6 to 7 feet. Occasional showers.
Friday night..East winds 20 knots. Wind waves 8 feet. Northwest swell 6 feet and northeast 7 feet. Occasional showers in the evening, then showers likely after midnight.
Saturday..East winds 20 knots. Wind waves 7 feet. Northwest swell 4 feet and northeast 6 to 7 feet. Showers likely in the morning, then scattered showers in the afternoon.
Saturday night..East winds 15 knots. Wind waves 6 feet. Northwest swell 4 feet and northeast 5 to 6 feet. Scattered showers.
Sunday..Northeast winds 15 knots. Wind waves 6 to 7 feet. Northwest swell 4 to 5 feet and northeast 4 to 5 feet. Scattered showers.
Monday..East winds 20 knots. Wind waves 8 feet. Mixed swell northwest 6 to 8 feet and east 4 feet. Scattered showers.
PHZ100 338 Pm Hst Wed Dec 11 2019
Synopsis for hawaiian coastal waters.. A front northwest of kauai is weakening. A new front will move into its place Thursday night, then dissipate Friday and Friday night. A strong surface high will pass north of the islands Thursday night into Friday, driving a boost in trade wind speeds. A large northwest swell will spread across local waters today through Friday.


7 Day Forecast for Marine Location Near Hanamaulu, HI
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location: 22, -159.33     debug


Area Discussion for -
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FXHW60 PHFO 120152 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 352 PM HST Wed Dec 11 2019

SYNOPSIS. Light trade winds and mostly dry weather will prevail through Thursday. Strong high pressure passing north of the islands will bring increasing trade winds Thursday night and Friday, with locally breezy trades persisting into the weekend. The strengthening trade winds will bring passing clouds and showers to windward portions of the islands, but a front stalling just northwest of the area will bring increased rainfall to Kauai and adjacent waters the next couple of days. High clouds are expected to periodically pass over the islands from Thursday night through Saturday.

DISCUSSION. Light trade winds will favor an E-SE direction through Thursday, while the island atmosphere remains mostly dry and stable, due to a nearby deep-layer ridge extending over the area from the E. Skies over the islands clouded somewhat this afternoon, but only resulted in a few light showers. Windward Maui received some rainfall this morning due to the interaction between the low-level wind flow and the Big Island's "bow wave", but mostly dry conditions continue to prevail. While little significant change is expected overnight into Thursday, some changes are expected later Thursday.

A strong and fast-moving high far NW of the islands will track steadily E through the weekend, with another high following a similar track Sunday and Monday as they both pass far N of the islands. As the first high tracks E, a NE-SW oriented frontal boundary is expected to produce active weather over waters just NW of Kauai beginning Thursday. Strong to near gale force NE winds will develop N of the boundary, while moderate to fresh E trade winds will develop S of the boundary (and over the islands) Thursday night and Friday.

At this time, the stronger winds and active weather along and N of the front are not expected to directly affect the islands or the coastal waters, but it is expected to be close to Kauai, and thus bears watching. This is especially the case because a closed low aloft is expected to develop just W of Kauai around the same time, likely prompting heavy showers along the boundary. Latest ECMWF guidance brings the low closer to Kauai than GFS guidance, so some uncertainty remains as to the potential for impacts on Kauai. Greatest chance for enhanced rainfall on Kauai looks to be Friday night. As the high continues moving E into the weekend, the low aloft and the surface frontal boundary will move W, with locally breezy trade winds over the islands. Some moderation of trade wind speeds is expected on Sunday, only to strengthen again Monday and Tuesday as the second high passes N of the area.

Best chances for showers in the short term will be on the Kauai end of the chain Thursday night into Saturday due to the nearby frontal boundary and developing low aloft, and along windward Big Island, where trade winds will likely deliver some showery low clouds from time to time. Over the weekend, the breezy trade winds will deliver passing clouds and showers that will focus over windward areas over all islands, but no organized shower areas are expected, and weak ridging aloft should cap incoming moisture.

A mid-level ridge will build over the area early next week, acting to further strengthen the cap, so trades should deliver limited showers at that time. Moisture associated with dissipated frontal boundaries may arrive on the trade flow next week, which may help to fuel modest increases in windward showers.

AVIATION. With a light east to southeast background flow, daytime sea breezes and nighttime land breezes will develop over parts of the state through Thursday. This will lead to some cloud buildups over island interiors, and leeward and mauka sections in the afternoon and early evening, with clearing overnight. Little in the way of rainfall is expected due to a stable air mass over the area. VFR will predominate in most areas most of the time.

A front approaching from the northwest will begin to affect Kauai by as early as late afternoon Thursday, and trade winds will begin to increase. Trades will then ramp up for most of the state by Friday as the front stalls near the Garden Isle.

MARINE. A front will enter the far northwest offshore waters tonight, accompanied by northeast winds in the 15 to 25 kt range. This front will move eastward and stall Thursday night. A new high will pass north of Kauai Thursday night and Friday, driving a boost in northeast winds to near gale force north of the front. Waters around Kauai will see stronger winds Thursday night and Friday. Strong trades will also develop over the typically windy local waters on Friday. As the high continues eastward, trades will weaken over the western end of the island chain by Saturday, but the locally strong trades over the eastern waters will continue through the weekend and into next week.

A northwest swell continues to build across local waters late this afternoon and a High Surf Warning remains in effect for north and west facing shores of Niihau, Kauai, Oahu, and Molokai as well as for north facing shores of Maui. The lower half of the Kona coast will see a rise in surf heights but may not reach advisory level. The surf will peak early Thursday, then lower to below advisory level late Friday. Another northwest swell may produce advisory level surf early next week.

Surf along east facing shores will continue below seasonal average tonight. A boost in the trades Thursday into Friday will likely lead to higher surf along east facing shores of all islands, but especially for Kauai where a High Surf Advisory may be needed for the island's east facing shores. Additionally, waters will turn rough and choppy around Kauai. The trade swell will gradually back down over the weekend as the trade wind eases. Due to the large northwest swell, a Small Craft Advisory remains in effect for all windward waters, Kauai to the Big Island, as well as the leeward waters of Kauai and Oahu, including the Kaiwi Channel. This advisory will also cover the strong northeast winds slated for Kauai County waters Thursday night into Friday. The Small Craft Advisory, due to locally strong northeast winds, will likely be issued for waters around Maui County and waters south of the Big Island Thursday night or Friday. Given the outlook described above, expect this advisory to continue through the weekend and into early next week.

HFO WATCHES/WARNINGS/ADVISORIES. High Surf Warning until 6 PM HST Thursday for North and West facing shores of Niihau Kauai Oahu Molokai and North facing shores of Maui.

Small Craft Advisory until 6 PM HST Thursday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Big Island Windward Waters.



DISCUSSION . Birchard AVIATION . Kinel MARINE . Powell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 3 mi56 min E 2.9 G 5.1 79°F 1016.8 hPa
51201 - Waimea Bay, HI (106) 68 mi38 min 78°F11 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lihue, Lihue Airport, HI2 mi51 minE 410.00 miOvercast81°F69°F67%1016.8 hPa
Kekaha, Pacific Missile Test Facility Barking Sands, HI24 mi1.8 hrsNW 510.00 miFair82°F70°F67%1016.6 hPa

Link to 5 minute data for PHLI

Wind History from HLI (wind in knots)
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Last 24hrNE4NE4NW4NW4NW5W6W6W7W8W8W9W7W9W7W7W7W6CalmE4E7SE7E5NE6E4
1 day agoSE4CalmE4NW3W3W5W3W6W7W7W7W6W8W7W7W8W4N4NE5NE7NE6NE6NE6E5
2 days agoSE8CalmCalmSW3W4W4W5W6W4W5W3W5W7W6W7W5CalmCalmCalmSE6SE6SE9SE7SE5

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Wed -- 03:30 AM HST     2.19 feet High Tide
Wed -- 06:37 AM HST     Moonset
Wed -- 07:05 AM HST     Sunrise
Wed -- 10:29 AM HST     0.36 feet Low Tide
Wed -- 03:00 PM HST     0.74 feet High Tide
Wed -- 05:52 PM HST     Moonrise
Wed -- 05:55 PM HST     Sunset
Wed -- 07:14 PM HST     Full Moon
Wed -- 08:35 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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1.11.622.22.221.61.20.80.50.40.40.50.60.70.70.70.50.30.1-0.1-0.10.10.4

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Wed -- 02:18 AM HST     2.29 feet High Tide
Wed -- 06:38 AM HST     Moonset
Wed -- 07:06 AM HST     Sunrise
Wed -- 09:03 AM HST     0.36 feet Low Tide
Wed -- 01:49 PM HST     0.84 feet High Tide
Wed -- 05:52 PM HST     Moonrise
Wed -- 05:55 PM HST     Sunset
Wed -- 07:09 PM HST     -0.12 feet Low Tide
Wed -- 07:14 PM HST     Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.12.32.221.61.10.70.50.40.40.50.70.80.80.70.50.30-0.1-0.10.20.61.1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (21,6,7,8)
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Ground Weather Radar Station Kauai, HI
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