Sunday, December15, 2019
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Marine Weather and Tides
Naalehu, 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 6:45AMSunset 5:45PM Sunday December 15, 2019 2:31 PM HST (00:31 UTC) Moonrise 9:35PMMoonset 10:05AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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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PHZ124 Big Island Southeast Waters- 1000 Am Hst Sun Dec 15 2019
.small craft advisory in effect through early Monday morning...
Rest of today..East winds to 25 knots. Wind waves 8 feet. North swell 5 feet. Isolated showers through the day.
Tonight..Northeast winds to 25 knots. Wind waves 10 feet. North swell 4 feet. Isolated showers in the evening, then scattered showers after midnight.
Monday..Northeast winds to 25 knots. Wind waves 10 feet. North swell 4 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Monday night..Northeast winds to 25 knots. Wind waves 10 feet. Northwest swell 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Tuesday..Northeast winds to 25 knots. Wind waves 10 feet. Northwest swell 6 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tuesday night..East winds to 25 knots. Wind waves 8 feet. Northwest swell 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Wednesday..East winds to 25 knots. Wind waves 8 feet. Northwest swell 4 to 5 feet. Scattered showers.
Thursday..East winds to 25 knots. Wind waves 9 feet. Northwest swell 4 to 5 feet. Scattered showers.
PHZ100 1000 Am Hst Sun Dec 15 2019
Synopsis for hawaiian coastal waters.. Locally strong trades today will strengthen tonight as a 1027 mb surface high passes north of the islands. Stronger trades with gales in some of the channels are towards the end of the week as a strong surface high of 1035 mb passes north of the islands. A large northwest swell will arrive Monday and peak Monday night.


7 Day Forecast for Marine Location Near Naalehu, HI
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location: 19.08, -155.55     debug


Area Discussion for -
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FXHW60 PHFO 152010 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 1010 PM HST Sun Dec 15 2019

SYNOPSIS. Moderate trade winds will prevail today, then strengthen Monday, with breezy conditions expected into Tuesday. The trades will trend down Wednesday into Thursday, before increasing to locally windy levels late Thursday into next weekend. The trades will continue to deliver low clouds and showers to windward areas with the occasional leeward spillover.

DISCUSSION. Trade winds (at times quite strong) will prevail through the upcoming week, supported by a pair of high pressure cells passing far N of the islands, with the central pressure of the second high expected to be anomalously high. Winds may turn SE next weekend as low pressure strengthens W of the islands, with this low potentially impacting island weather in just over a week from now.

Trade winds have eased somewhat over the past 24 hours, as a weakness in the ridge is passing N of the islands. A new high pressure cell is currently NW of the area, and will pass N of the islands tonight and Monday, leading to increased trade winds until another weakness in the ridge passes to the N around Wednesday. An even stronger high is expected to pass N of the islands late Thursday into Saturday, likely bringing another period of locally strong trade winds heading into next weekend. Central pressure of this high is expected to be an unseasonably high 1034 mb as it passes, and model guidance indicates very strong trade winds at the end of the week, with open ocean wind speeds of 30-35 mph near the islands.

As low pressure deepens W of the area next weekend, the gradient between the gradually weakening high and the developing low may bring strong SE winds to the state. Confidence is somewhat diminished as to the details, but model guidance has been fairly consistent indicating a somewhat energetic weather pattern in about a week from now as the low nears the islands.

In the meantime, expect passing windward showers and moderate trade wind until trade winds increase on Monday. A weak mid-level shortwave is now expected to pass from N to S over the area Monday and Monday night. The combined effects of increased orographic lift supplied by the increased trades, the passing shortwave, and moisture associated with a frontal remnant caught in the trade flow will likely lead to an increase in trade wind showers, and a slightly wetter regime than previously thought.

A mid-level ridge will build over the islands Tuesday and Wednesday, supporting a stable island atmosphere, but the trade winds should still be able to muster a few windward showers. The mid-level ridge will weaken Thursday and Friday, and increasing low level convergence associated with the new high building N of the area will likely fuel an increase in trade showers, with another frontal remnant potentially introducing moisture into the trade flow as well.

AVIATION. A cold front passing well north of Hawaii will keep moderate to fresh trade winds across the island today before winds strengthen tonight due to high pressure building in from the northwest. The trades will focus incoming low clouds and showers over windward slopes resulting in brief mountain obscurations today, which could increase in coverage late tonight. However, no AIRMETs are in effect at this time. AIRMET Tango will likely be issued tonight or Monday morning for leeward mountain turbulence as the trade winds strengthen.

MARINE. High pressure building north of the state tonight will bring an increase in trade winds and will result in fresh to strong trades through the first half of the week. Winds may near gale force Monday night into Tuesday across the Alenuihaha Channel. After a slight decrease of trade winds Wednesday night into Thursday, a 1035 mb high building north of the state will bring widespread strong to possibly gale force winds across the Hawaiian Waters Friday through the weekend.

Forerunners from a new northwest swell will begin to fill in late tonight and the swell is expected to steadily build through the day Monday. Surf will likely reach high end advisory levels Monday night as the swell peaks. Another advisory level northwest swell is expected to steadily build Wednesday night. The combination of strong trade winds and large northwest swells will bring widespread Small Craft Advisory conditions on Monday and will likely persist through most of the week.

With the expected boost in trades throughout the new work week, surf along east facing shores will be on the rise. Surf will likely reach the High Surf Advisory (HSA) criteria of 8 feet for east facing shores later in the week with the stronger surge of trade winds. It should be noted that waters and ocean conditions will be very rough and choppy through most of the 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 . Birchard AVIATION . Foster MARINE . Kino


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 52 mi44 min E 5.1 G 8 80°F 81°F1012.7 hPa

Wind History for Hilo, Hilo Bay, Kuhio Bay, HI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kailua / Kona, Keahole Airport, HI46 mi39 minSW 810.00 miMostly Cloudy81°F69°F67%1011.3 hPa

Link to 5 minute data for PHKO

Wind History from HKO (wind in knots)
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Last 24hrS6S6S6S6S7SE6E6E7E5E7E6E7NE5E5S4E4NE4E3CalmSW7S8S8SW10SW8
1 day agoS8SW10SW8SW6W4NE5NE6SE9SE8SE7SE6E4SE11SE8SE6SE5SE5SE8SE6S7S8S7S5SW7
2 days agoSW8SW7SW7SW6S4S3E5NE3CalmNE6E3E4NE5E3SE7SE5SE6S6S7S7S8S10S9S11

Tide / Current Tables for Honuapo, Hawaii Island, Hawaii
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Honuapo
Click for Map
Sun -- 06:06 AM HST     2.85 feet High Tide
Sun -- 06:47 AM HST     Sunrise
Sun -- 10:04 AM HST     Moonset
Sun -- 01:56 PM HST     0.28 feet Low Tide
Sun -- 05:47 PM HST     Sunset
Sun -- 06:33 PM HST     1.15 feet High Tide
Sun -- 09:34 PM HST     Moonrise
Sun -- 11:26 PM HST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.71.21.82.32.72.92.82.521.510.60.30.30.40.70.91.11.110.70.50.3

Tide / Current Tables for Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii
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Napoopoo
Click for Map
Sun -- 06:16 AM HST     2.45 feet High Tide
Sun -- 06:49 AM HST     Sunrise
Sun -- 10:06 AM HST     Moonset
Sun -- 02:00 PM HST     0.18 feet Low Tide
Sun -- 05:47 PM HST     Sunset
Sun -- 06:43 PM HST     0.75 feet High Tide
Sun -- 09:35 PM HST     Moonrise
Sun -- 11:30 PM HST     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.50.91.41.92.32.42.42.21.81.30.80.50.20.20.20.40.60.70.70.70.50.30.2

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 (19,4,5,8)
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Ground Weather Radar Station South Shore, HI
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.