Monday, December16, 2019
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Marine Weather and Tides
Hilo, 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 11:18 PM HST (09:18 UTC) Moonrise 9:32PMMoonset 10:04AM Illumination 78% 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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PHZ122 Big Island Windward Waters- 849 Pm Hst Sun Dec 15 2019
.small craft advisory in effect from Monday morning through Wednesday night...
Rest of tonight..East winds 20 knots. Wind waves 6 feet. Northwest swell 5 feet. Isolated showers early in the evening, then scattered showers after midnight.
Monday..Northeast winds 20 knots. Wind waves 7 feet. Northwest swell 6 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Monday night..East winds to 25 knots. Wind waves 7 feet. Northwest swell 9 feet. Isolated showers in the evening, then scattered showers after midnight.
Tuesday..East winds 20 knots. Wind waves 7 feet. Northwest swell 8 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tuesday night..East winds 20 knots. Wind waves 7 feet. Northwest swell 7 feet. Isolated showers in the evening, then scattered showers after midnight.
Wednesday..East winds 20 knots. Wind waves 7 feet. Northwest swell 6 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Wednesday night..East winds 20 knots. Wind waves 6 feet. Northwest swell 6 feet. Scattered showers.
Thursday..East winds 20 knots. Wind waves 6 to 7 feet. Northwest swell 7 to 8 feet. Scattered showers.
Friday..East winds to 25 knots. Wind waves 8 feet. North swell 7 feet. Scattered showers.
PHZ100 849 Pm Hst Sun Dec 15 2019
Synopsis for hawaiian coastal waters.. Trades will strengthen tonight and become very strong late Monday through Tuesday as a surface high passes north of the islands. Winds may approach gale force for the windier areas around the big island Monday night into Tuesday. After a brief easing Wednesday through Thursday, very strong trades are expected to return for the end of the week into next weekend, with gales possible again in some of the channels. Back to back large northwest swells are expected to build Monday and Wednesday night.


7 Day Forecast for Marine Location Near Hilo, HI
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location: 19.72, -155.08     debug


Area Discussion for -
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FXHW60 PHFO 160643 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 843 PM HST Sun Dec 15 2019

SYNOPSIS. The weather story this week remains tied to variations in the strength of the trade winds. Several progressive high pressure centers are rolling through the Central Pacific north of the Hawaiian Islands. Moderate trades on Monday will become breezy on Tuesday, before returning to more moderate speeds on Wednesday and Thursday. Cool and windy weather conditions are forecast from Thursday night into next weekend. Trade wind showers will prevail through Saturday favoring windward and mountain slopes in the overnight to early morning time periods.

DISCUSSION. The satellite view of the region shows a rapidly weakening cold front roughly 300 miles north of Kauai. The southern movement on this front will stall north of the island chain. As the front passes to the east cloud bands may break apart and drift over the state later this week. East of the islands unstable clouds are drifting through the trade wind flow. These clouds will produce periods of showers mainly affecting the typical windward and mountain areas enhanced during the typical overnight and early morning time periods. A few high cirrus clouds are also shown near the Big Island, these ice crystal clouds are associated with a lingering subtropical jet stream in the upper atmosphere.

Looking at the large scale view of the weather picture this evening we see two main high pressure centers over the North Pacific basin, roughly 1000 miles northwest and northeast of the state respectively with a cold front in the middle. These large scale pressure systems will move quickly from west to east across the Pacific this week changing local area pressure gradients and in turn producing variations in trade wind speeds each day. Expect trade wind speeds to become breezy on Monday as the cold front north of the island weakens and higher pressure builds in from the west. Trades become breezy to windy on Tuesday, returning to more moderate speed on Wednesday and Thursday, as the high center passes by and then drifts eastward away from the islands. By Thursday another weak cold front will linger 300 to 400 miles north of Kauai.

Trade winds will strengthen rapidly from Thursday night into Friday as an anomalously strong high pressure center rips across the Pacific Region. The global models continue to show another interesting weather development south of this high as a deepening cut off low pressure system gets caught up south of the ridge axis approaching the state from the west. Strong trade winds are expected to develop across all islands from Friday into Saturday with the subsidence aloft enhancing the wind speeds at the surface. Wind advisories are not out of the question with this developing weather pattern.

Weather outlook Sunday through Tuesday . The deepening cut off low approaching the islands from the west has the potential to produce heavy rainfall with thunderstorms over the islands in the extended outlook range of the forecast. However, as expected, global American and European models are both showing a variety of precipitation solutions this far out in the forecast ether. Island by island weather impacts and timing will have to wait until the time period gets closer. Please continue to monitor the weather forecasts for this seven to nine day weather outlook as forecast impacts will evolve over time.

AVIATION. Strengthening trade winds expected over the next twenty-four hours as a high pressure system north of Hawaii settles to the northeast of the area. Trade wind flow will focus incoming low clouds and showers along windward slopes and coasts. A 6000 ft inversion aloft will inhibit shower shower activity. No AIRMETs for mountain obscuration are in effect or anticipated at this time.

AIRMET Tango for leeward mountain turbulence will likely become necessary late tonight or Monday due to the strengthening trade wind flow.

MARINE. High pressure building north of the state will bring an increase in trade winds tonight, and very strong trades Monday through Tuesday night. Winds may reach gale force Monday night into Tuesday across the Alenuihaha Channel and waters south of the Big Island, therefore a Gale Watch is in effect for these waters. Winds are expected to trend down Wednesday into Thursday, but a new and stronger high building north of state will lead to another round of blasting trades towards the end of the week into the weekend. Gale force winds are likely for the typical windy areas around Maui County and the Big Island Friday into Saturday. Strong winds will likely continue across the marine area through the remainder of the upcoming weekend. The combination of strong trade winds and large northwest swells will bring widespread Small Craft Advisory conditions through most of the week.

Forerunners from a large northwest swell will begin to fill in late tonight, with the swell steadily building through the day Monday. Surf is expected to reach high end advisory levels along north and west facing shores exposed to the swell Monday night as the swell peaks. This swell will lower Tuesday though Wednesday, with another northwest swell expected to steadily build Wednesday and Wednesday night, and peaking near advisory levels on Thursday. This swell will then gradually lower Friday through the weekend while shifting to a more northerly direction.

With the expected boost in trades, surf along east facing shores will be on the rise this week. Surf may approach High Surf Advisory (HSA) levels Monday night through Tuesday night, but most likely will remain just below HSA thresholds. Stronger trades late in the work week, will likely result in surf reaching advisory criteria along east facing shores Friday through the upcoming weekend. Very rough and choppy conditions are expected across the waters through most of the week.

HFO WATCHES/WARNINGS/ADVISORIES. Gale Watch from Monday evening through Tuesday afternoon for Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.

Small Craft Advisory until 6 PM HST Monday for Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.

Small Craft Advisory from 6 AM Monday to 7 PM HST Wednesday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel-Oahu Windward Waters-Oahu Leeward Waters- Kaiwi Channel-Maui County Windward Waters-Maui County Leeward Waters-Big Island Windward Waters.

Small Craft Advisory until 7 PM HST Wednesday for Maalaea Bay- Pailolo Channel.



DISCUSSION . Bohlin AVIATION . Bedal MARINE . Jelsema


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi48 min WNW 8 G 9.9 71°F 80°F1016.1 hPa
51206 7 mi32 min 79°F10 ft
KWHH1 45 mi54 min NNE 1.9 G 5.1 77°F 81°F1014.5 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 mi25 minW 86.00 miLight Rain Fog/Mist71°F66°F87%1016.2 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrSW6SW4SW6S3CalmCalmSW4SW6SW5SW43CalmCalmSE6E8E6NE7NE4CalmSW3SE6S6NW5NW8
1 day agoSW55W6W3CalmSW4SW7SW6SW4SW7Calm3E5SE9S5SE6E4E7S3CalmCalmW6W6SW4
2 days agoS5SW5W8SW4NE4SE6W7W9SE4S6W8S6E54SE8E5NE5NE4CalmCalmSW4SW5SW5SW5

Tide / Current Tables for Hilo, Hawaii Island, Hawaii
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Hilo
Click for Map
Mon -- 06:17 AM HST     2.73 feet High Tide
Mon -- 06:47 AM HST     Sunrise
Mon -- 10:54 AM HST     Moonset
Mon -- 02:05 PM HST     0.23 feet Low Tide
Mon -- 05:44 PM HST     Sunset
Mon -- 07:21 PM HST     1.22 feet High Tide
Mon -- 10:33 PM HST     Moonrise
Mon -- 11:46 PM HST     0.50 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.71.21.72.22.52.72.72.421.510.60.30.20.30.60.81.11.21.210.80.6

Tide / Current Tables for Kawaihae, Big Island, Hawaii (2)
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Kawaihae
Click for Map
Mon -- 06:51 AM HST     Sunrise
Mon -- 07:17 AM HST     2.23 feet High Tide
Mon -- 10:57 AM HST     Moonset
Mon -- 03:01 PM HST     0.13 feet Low Tide
Mon -- 05:46 PM HST     Sunset
Mon -- 08:21 PM HST     0.72 feet High Tide
Mon -- 10:36 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.30.60.91.41.82.12.22.221.61.20.80.40.20.10.20.30.50.60.70.70.60.5

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 (4,6,7,8)
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Ground Weather Radar Station Kohala, 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.