Thursday, July29, 2021
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Marine Weather and Tides
Hilo, HI

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:54AMSunset 6:59PM Thursday July 29, 2021 3:13 PM HST (01:13 UTC) Moonrise 11:15PMMoonset 11:08AM Illumination 69% Phase: Waning Gibbous; Moon at 20 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- 941 Am Hst Thu Jul 29 2021
Today..East winds 20 knots. Wind waves 5 feet. SWell southeast 3 feet. Scattered showers in the morning, then isolated showers in the afternoon.
Tonight..East winds 20 knots. Wind waves 5 feet. Isolated showers in the evening, then scattered showers after midnight.
Friday..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Scattered showers in the morning.
Friday night..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers through the night.
Saturday..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers in the morning.
Saturday night..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers through the night.
Sunday..East winds 20 knots. Wind waves 6 feet. SWell southeast 3 feet. Isolated showers.
Monday..East winds 20 knots. Wind waves 5 feet. Scattered showers.
PHZ100 941 Am Hst Thu Jul 29 2021
Synopsis for hawaiian coastal waters.. High pressure far north of the state will continue to produce fresh to strong trade winds into early next week.


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 292004 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI Issued by National Weather Service San Francisco CA 1004 AM HST Thu Jul 29 2021

SYNOPSIS. Moderate to breezy easterly trade winds will strengthen later today through the weekend. Clouds and showers will favor windward and mauka locations, with the best chances through the overnight and early morning periods. A return of drier trade wind conditions is anticipated Friday through early next week.

DISCUSSION. A ridge of high pressure will continue to build across the island today pushing the upper level trough that brought cloudy conditions to the western end of the state yesterday northward. High clouds have mostly cleared across the state with the exception of the Big Island that will continue to see high clouds from a disturbance south of the islands. At the surface, trade winds have returned to the region and are expected to remain moderate through tonight before strengthening on Friday as high pressure builds north of the state. A large area of moisture to the east is forecast to move into the eastern end of the state today. Anticipate windward and mauka showers through the morning hours as this area of moisture approaches the islands. In its wake, satellite data reflects dry air farther upstream of the Big Island. Guidance has initialized well with this and has the dry air moving through from east to west tonight through Friday. This dry air combined with rising upper heights will lead to more of a suppressed and stable environment this weekend, which will limit cloud/shower windward coverage. Similar conditions will carry into next week.

AVIATION. Surface high pressure north of the islands will maintain a moderate to locally strong trade wind flow through at least tonight. AIRMET Tango for low level turb, south through west of mountains, will continue through tonight as well. Scattered to broken low clouds and showers riding in with the trades upwind of the islands will result in brief MVFR ceiling and vis, favoring the windward and mountain areas. The lee side of the Big Island can expect a couple of afternoon and evening showers as well. Tops of these clouds and showers will be around 8k feet. No other AIRMETS are anticipated today.

MARINE. A high pressure system far north of the region will slowly drift eastward and build from Friday into the weekend. Trade winds will strengthen from Friday onward. A Small Craft Advisory (SCA) remains in effect for the typically windy waters around Maui County and the Big Island. This SCA may be expanded in coverage over the next two days.

Surf along east facing shores will remain small through Friday, then trend up over the weekend in response to strengthening trades locally and upstream of the Hawaiian Islands.

Southerly swell activity will remain rather low for this time of the year with just background swells expected from the south and southeast. Nearly flat conditions will continue for north and west facing shores into early next week. Buoy 51001 observations are not showing any reflection of the potential small, west-northwest swell this morning, which supports the summertime conditions continuing.

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



DISCUSSION . CW AVIATION . H Lau MARINE . Bohlin


Weather Reporting Stations
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On 03/09/2021 the NDBC primary processing servers were shut off due to a facilities issue. Station pages on the NDBC website are not updating and there is no ETR at this time. We will update this banner as we learn more.
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ILOH1 - 1617760 - Hilo, HI 1 mi56 min NNE 6 G 8.9 79°F 80°F1015.7 hPa
KWHH1 45 mi56 min Calm G 4.1 83°F 83°F1015.2 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 mi21 minVar 510.00 miMostly Cloudy84°F70°F63%1016.6 hPa

Link to 5 minute data for PHTO

Wind History from HTO (wind in knots)
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Last 24hrNE9NE9NE8NE5E3E5CalmSW4SW4W3SW4CalmSW4CalmSE6S3SW3SW4E9NW4E8E8E85
1 day agoNE9NE10E7NE53CalmW5W4W5W4CalmSW4SW4CalmSE5W6W8W7W3NE8W4N6NE10E9
2 days agoE9NE10E10E6E12E11W7SW5SW4W4CalmW3SW4SW4CalmCalmW3CalmNE8NE8NW7NE9E7NE7

Tide / Current Tables for Hilo, Hilo Bay, Kunio Bay, Hawaii Island, Hawaii
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kawaihae, Big Island, Hawaii
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Kawaihae
Click for Map
Thu -- 02:16 AM HST     0.15 feet Low Tide
Thu -- 05:57 AM HST     Sunrise
Thu -- 08:37 AM HST     1.33 feet High Tide
Thu -- 11:11 AM HST     Moonset
Thu -- 01:49 PM HST     0.72 feet Low Tide
Thu -- 07:01 PM HST     Sunset
Thu -- 07:51 PM HST     1.63 feet High Tide
Thu -- 11:17 PM HST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.30.20.20.40.60.91.21.31.31.21.10.90.80.70.811.21.41.61.61.51.31

Weather Map
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GEOS Local Image of Hawaii    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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