Thursday, December12, 2019
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Marine Weather and Tides
Kaumakani, 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 6:59AMSunset 5:52PM Thursday December 12, 2019 1:18 AM HST (11:18 UTC) Moonrise 6:47PMMoonset 7:38AM 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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PHZ112 Kauai Leeward Waters- 930 Pm Hst Wed Dec 11 2019
.small craft advisory in effect through Thursday afternoon...
Tonight..Northeast winds 10 knots. Wind waves 2 feet or less. Northwest swell 14 feet. Slight chance of showers.
Thursday..Northeast winds 15 knots rising to to 25 knots in the afternoon. Wind waves 2 feet or less then 3 feet in the afternoon. Northwest swell 12 feet. Chance of showers through the day.
Thursday night..East winds 20 knots. Wind waves 5 feet. Northwest swell 10 feet. SWell northeast 3 feet. Scattered showers.
Friday..East winds 20 knots. Wind waves 6 feet. Northwest swell 8 feet and northeast 4 to 5 feet. Isolated showers in the morning.
Friday night..East winds 20 knots. Wind waves 6 feet. Northwest swell 5 feet and northeast 6 feet. Showers likely.
Saturday..East winds 20 knots. Wind waves 6 feet. Northwest swell 4 feet and northeast 6 feet. Isolated showers in the morning.
Saturday night..East winds 15 knots. Wind waves 6 feet. Northwest swell 4 feet and northeast 5 feet. Isolated showers.
Sunday..Northeast winds 15 knots. Wind waves 5 to 6 feet. Mixed swell northwest 4 to 6 feet and northeast 3 to 4 feet. Scattered showers.
Monday..East winds 20 knots. Wind waves 7 feet. Northwest swell 7 to 9 feet and northeast 3 feet. Isolated showers.
PHZ100 930 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 tonight and Thursday, remaining through Friday.


7 Day Forecast for Marine Location Near Kaumakani, HI
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location: 21.91, -159.63     debug


Area Discussion for -
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FXHW60 PHFO 120634 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 834 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. No changes to the forecast this evening. Satellite and radar data show the clearing trend we were expecting over the central islands with some clouds and showers lingering northwest of Kauai and over/near the Big Island. Expect that trend to continue overnight.

Light trade winds are expected through Thursday with a weakening front to the north west of the islands. A mostly dry and stable airmass over the islands will limit clouds and rain. Expect similar conditions on Thursday however the clouds and showers that form may be focused a bit more on the windward slopes.

High pressure far northwest of the islands will move to the east through the weekend, followed by another high early next week. Both highs will remain north of the islands. The front to the northwest of the islands will be pushed over the western end of the coastal waters beginning Thursday. Winds north of the front are expected to be strong and out of the northeast, while out ahead of the front moderate easterly trades are expected Thursday night and Friday.

Kauai will be the most likely to experience stronger winds and increased rainfall from the front. In the upper atmosphere, an upper level trough is expected to drop down and form an upper level low to the southwest of the islands, however there remain some differences in the model solutions. At this time, the forecast reflects the greatest chance for rainfall on Kauai to be Thursday night into Saturday, with the most enhanced Friday night.

As the high mentioned above moves to the east this weekend, the upper level low will move to the west, and locally breezy trade winds will spread across the islands. As we transition to the second high, trade winds could slacken a bit on Sunday, before rebounding with the second high Monday and Tuesday. With the trade wind flow over the islands. showers will be focused over windward areas for the remaining islands.

Mid and upper level ridging moving over the region early next week will help to stabilize the atmosphere limiting trade winds showers, however leftover frontal moisture will be riding in on the trades at times will bring some moisture bands in on the trades from time to time.

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 dominate in most areas.

A front approaching from the northwest will begin to affect Kauai as early as Thursday afternoon, with increasing trade winds, clouds and showers. Clouds and winds will increase for rest of the state by Friday as the front stalls near the Garden Isle.

MARINE. A large northwest swell will enter Hawaiian waters tonight and build surf to above warning levels Thursday morning. A High Surf Warning is in effect for north and west facing shores of Niihau, Kauai, Oahu, and Molokai as well as for north facing shores of Maui. A high surf advisory is in effect for the leeward Big Island coast. 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.

A full moon high tide early Thursday morning (between 2-6am depending on location) and the large NW swell will bring the potential of overwash along coastal areas. As of 8pm, the swell is running 1-3 feet larger than the WW3 predicted values at buoys 51001 and 51101. Added to the large swell and full moon tide, is the fact that tide gauges across the state have been showing water levels near 6/10 of a foot above predicted values. All of these factors combined will allow waves to reach higher along exposed coastlines and over low lying coastal roadways.

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 NW of Kauai. 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 across the coastal 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.

Surf along east facing shores is currently below the seasonal average. A boost in the trades Thursday into Friday will lead to higher surf along east facing shores of all islands, but especially for Kauai where a High Surf Advisory may be needed for east facing shores. The trade swell will gradually back down over the weekend as winds ease. Due to the large northwest swell, a Small Craft Advisory remains in effect for all windward waters 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. A Small Craft Advisory for winds will likely be issued for waters around Maui County and south of the Big Island Thursday night. 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 Niihau-Kauai Windward-Kauai Leeward-Waianae Coast-Oahu North Shore-Oahu Koolau-Olomana-Molokai-Maui Windward West-Maui Central Valley- Windward Haleakala.

High Surf Advisory until 6 PM HST Thursday for Kona.

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 . M Ballard AVIATION . TS MARINE . Morrison


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NWWH1 - 1611400 - Nawiliwili, HI 15 mi54 min W 5.1 G 6 69°F 1018 hPa
51201 - Waimea Bay, HI (106) 82 mi42 min 77°F14 ft

Wind History for Nawiliwili, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kekaha, Pacific Missile Test Facility Barking Sands, HI14 mi22 minENE 310.00 miMostly Cloudy73°F64°F76%1018.1 hPa
Lihue, Lihue Airport, HI16 mi25 minW 710.00 miFair72°F68°F87%1018 hPa

Link to 5 minute data for PHBK

Wind History from HBK (wind in knots)
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Last 24hrE5E5--NE4NE5NE4E5--NW45S8S9NW6NW5NW5N5N4CalmCalmE4E5CalmCalmNE3
1 day agoE4CalmE4NE4E4E5E5CalmW4NW6NW7NW7NW5W5W5NW5NW3CalmE4E4E3E4E4E4
2 days agoE3NE4E4E4E5E5E4SE5SE6S10S11S10S8S8SW10S5CalmE3CalmCalmSE3E4E4E3

Tide / Current Tables for Hanamaulu Bay, Kauai Island, Hawaii
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Hanamaulu Bay
Click for Map
Thu -- 04:07 AM HST     2.28 feet High Tide
Thu -- 07:06 AM HST     Sunrise
Thu -- 07:36 AM HST     Moonset
Thu -- 11:17 AM HST     0.30 feet Low Tide
Thu -- 03:44 PM HST     0.67 feet High Tide
Thu -- 05:55 PM HST     Sunset
Thu -- 06:45 PM HST     Moonrise
Thu -- 09:10 PM HST     -0.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.91.41.82.12.32.21.91.51.10.70.40.30.30.40.60.60.70.60.40.2-0-0.1-00.2

Tide / Current Tables for Hanalei Bay, Kauai Island, Hawaii
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Hanalei Bay
Click for Map
Thu -- 02:56 AM HST     2.38 feet High Tide
Thu -- 07:07 AM HST     Sunrise
Thu -- 07:37 AM HST     Moonset
Thu -- 09:51 AM HST     0.30 feet Low Tide
Thu -- 02:33 PM HST     0.77 feet High Tide
Thu -- 05:55 PM HST     Sunset
Thu -- 06:45 PM HST     Moonrise
Thu -- 07:44 PM HST     -0.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.622.32.42.21.91.510.60.40.30.40.50.70.80.80.60.40.1-0.1-0.100.30.8

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
Wind Forecast for (6,6,7,8)
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Ground Weather Radar Station Kauai, HI
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