Glenn James
Hawaii Weather Today
Creator, Author, and Administrator for 30 years

 

The latest update to this website was at 513am Sunday morning HST


Here are the latest 24-hour precipitation totals (inches) for each of the islands Sunday morning: 

0.74  Mount Waialeale, Kauai
0.18  Tunnel RG, Oahu
0.10  Puu Alii, Molokai
0.01  Lanai City, Lanai
1.91  West Wailuaiki, Maui
2.23  Kawainui Stream, Big Island


The following numbers represent the strongest wind gusts (mph) Sunday morning: 

21  Lihue, Kauai – NE 
27  Kuaokala, Oahu – SW
28  Makapulapai, Molokai – E
m  Lanai – m
29  Na Kula, Maui – E 
24  PTA Range 17, Big Island – SE


Hawaii’s Mountains – Here’s a link to the live webcam on the summit of our tallest mountain Mauna Kea (~13,800 feet high) on the Big Island of Hawaii. Here’s the webcam for the (~10,023 feet high) Haleakala Crater on Maui (out of operation). These webcams are available during the daylight hours here in the islands, and at night whenever there’s a big moon shining down. Also, at night you will be able to see the stars, and the sunrise and sunset too…depending upon weather conditions.

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Big Blue…click twice for largest version

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/tpw/13/GOES18-TPW-13-900x540.gif

 Thunderstorms southeast in the deeper tropics

 

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Low clouds arriving on the trade winds…higher clouds coming up from the southwest at times

 

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https://radar.weather.gov/ridge/standard/PHKI_loop.gif

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Localized showers 

 

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Please open this link to see details on any current Watches, Warnings and Advisories noted above




~~~ Hawaii Weather Narrative ~~~

 

Glenn’s Sunday comments:  I’m at home here in upper Kula, Maui, Hawaii

508am, it’s mostly clear here in upper Kula with calm winds, and a low temperature at my place of 55.5 degrees…with the relative humidity 80%

The warm tropical waters of the Earth’s oceans are very active with tropical cyclones now…and with areas that could become tropical cyclones! There are hints that we could see something coming our way later in the upcoming new week…more information on that possibility here:

Central North Pacific: There are no active tropical cyclones

A tropical wave located more than 1000 miles east-southeast of the Hawaiian Islands, is producing a large area of disorganized showers and thunderstorms. Environmental conditions are forecast to be conducive for further development, and a tropical depression is expected to form in a few days, while the system moves west-northwestward across the Central Pacific.

* Formation chance through 48 hours…low…30 percent
* Formation chance through 7 days…high…90 percent

 

>>> Highest Temperature Saturday, August 8, 2026 – 124 degrees at Death Valley, CA

>>> Lowest Temperature Saturday, August 8, 2026 – 29 degrees near Bynum, MT

 

Interesting weather blog: Mauka Showers…Sea Breeze Variations in the Big Island’s South Kohala District

 

Hawaii’s Weather Highlights…as of Sunday morning: Light and breezy trades with light showers primarily occurring along windward areas and higher terrain. A plume of moisture moving south of the islands will increase rain chances over the eastern end of the state through Monday, followed by drier mid-week conditions. Brewing disturbances within the eastern Pacific will need to be monitored for tropical cyclone development over the next few days.

Weather Narrative..as of Sunday morning: An upper ridge centered northeast of the islands has its axis draped southwest over the region. This feature has provided enough stability, as evidenced by the upstream stratiform clouds, to maintain partly cloudy and relatively dry conditions. Upper ridging will gently back off the next couple of days, with the result being a deeper, more moist boundary layer. This will assist in producing greater clouds and more widespread rain caught up within moderate trade flow, especially for the windward communities of Big Island and Maui.

An area of higher moisture southeast of Big Island will pass across the eastern half of the state through early Monday. This more moist air mass will primarily impact Big Island but may clip Maui County and Oahu through early Monday. This will likely be the cause for more frequent, mainly windward and upslope mountain showers today and tomorrow. Locally heavy rainfall is also possible on Big Island and windward Maui through Monday morning.

If enough early day sun heats up Mauna Kea and Mauna Loa’s (primarily western) slopes, in tandem with this higher moisture flux from the south, there is a slight chance for an isolated thunderstorm or two to develop this afternoon. Despite increased cloud cover, the day will still warm up in the statewide average middle to upper 80’s. Trades will be welcome with many coastal, low lying spots experiencing the mugginess as dew points remain in the low 70’s.

Once this area of southern moisture most west-southwest of the area Tuesday, a drier air mass will briefly pass through during the middle of the week. Clearer skies and limited shower activity with breezy trades, will not undergo much change Tuesday through Thursday.

There are increasing probabilities that an easterly trough located about 1,000 miles east-southeast of the islands, or near 10N140W, will develop a low center and strengthen into tropical cyclone by mid-week. The NHC has assigned a 90 percent probability of tropical cyclone development over the next 7-days. The majority of the model guidance track a tropical cyclone toward the state later in theweek.

While still too early to definitively discuss the details of a potential tropical cyclone impacting Hawaii, this active area will warrant close monitoring the next few days. If not already finalized, now is the time to begin finishing up your Hurricane Plan(s) and be ready to execute the plan when and if the time comes.

 

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Here’s a near real-time Wind Profile of the Pacific Ocean – along with a Closer View of the islands / Here’s the latest Weather Map / Looping Surface Precipitation…through the next 8-days / Vog Map

 

Marine Conditions…as of Sunday morning: Fresh to locally strong trade winds will persist through at least Wednesday, as high pressure remains anchored northeast of the state. A Small Craft Advisory (SCA) has been extended for the typical windy channels and waters around Maui County and the Big Island through Monday afternoon.

Borderline conditions will likely continue through at least Wednesday, which may prompt further extensions of the SCA. Later in the week, the focus will shift to the deep tropics southeast of the state. A tropical cyclone is likely to develop over the next few days, and have an effect on local winds, seas and weather as early as Thursday.

Continued small overlapping south-southwest swells will produce south shore surf near August average through Monday, and near to above average surf on Tuesday. A larger swell will arrive Tuesday night and may push surf to the High Surf Advisory level late Wednesday through Friday. This swell should slowly decrease next weekend.

Along east-facing shores, short-period trade wind swell will generate surf just below August average through Thursday. An increase in southeast swell is possible Friday and next weekend generated by a tropical cyclone that is likely to develop southeast of the islands over the next few days. Aside from wrapping trade wind energy, surf along north-facing shores will remain flat to tiny through the week.

Due to a combination of peak monthly high tides and water levels running higher than predicted in a few locations, a Coastal Flood Statement is in effect for minor coastal flooding possible around the afternoon high tide through at least Tuesday. Tides will be decreasing on Wednesday, but coastal flooding may continue to be possible around high tide for locations where water levels are running highest.

 

Green Scene in Oahu, Hawaii | Paysage jungle, Endroits merveilleux, Hawaï


World-wide Tropical Cyclone Activity


>>> Here’s a link to the latest Pacific Disaster Center’s Weather Wall


>>> Atlantic Ocean: There are no active tropical cyclones

Central Tropical Atlantic:

A broad area of showers and thunderstorms associated with a tropical wave is located several hundred miles west-southwest of the Cabo Verde Islands. Some gradual development of this system is possible during the early to middle part of this week while it moves westward across the central tropical Atlantic. Upper-level winds are expected to become less conducive for development later in the week when the system approaches the Lesser Antilles.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…20 percent

 

Eastern and Central Tropical Atlantic:

Another tropical wave is expected to move off the west coast of Africa early this week. Environmental conditions are forecast to be conducive for gradual development thereafter and a tropical depression could form during the latter half of this week while the system moves generally westward across the eastern and central tropical Atlantic.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…medium…40 percent

 

>>> Caribbean Sea: There are no active tropical cyclones

Tropical cyclone formation is not expected during the next 7 days.

>>> Gulf of America: There are no active tropical cyclones

Tropical cyclone formation is not expected during the next 7 days.

 

Northeast Pacific: There are no active tropical cyclones

 

>>> Western East Pacific:

A tropical wave located several hundred miles southwest of the southern tip of the Baja California Peninsula is producing a large area of disorganized showers and thunderstorms. Environmental conditions are forecast to be conducive for gradual development, and a tropical depression could form during the next few days while the system moves slowly west-northwestward to northwestward across the western portion of the East Pacific.

*Formation chance through 48 hours…low…30 percent
*Formation chance through 7 days…medium…60 percent

 

>>> Southwest of Mexico:

An area of low pressure could form well offshore of the southwestern coast of Mexico by the middle part of the week. Little, if any, development is anticipated while it moves generally west-northwestward.

*Formation chance through 48 hours…low…near 0 percent
*Formation chance through 7 days…low…10 percent

 

Central North Pacific: There are no active tropical cyclones

A tropical wave located about 1000 miles east-southeast of the Hawaiian Islands is producing disorganized showers and thunderstorms. Environmental conditions are forecast to be conducive for further development, and a tropical depression is expected to form during the next few days while the system moves west-northwestward across the Central Pacific.

* Formation chance through 48 hours…low…30 percent
* Formation chance through 7 days…high…90 percent

 

>>> Northwest Pacific Ocean:

https://www.metoc.navy.mil/jtwc/products/abpwsair.jpg

Tropical cyclone 12W (Dolphin)…is located approximately 175 NM north-northwest of Taipei, Taiwan – Final Warning

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Tropical cyclone 14W (Chan-hom)…is located approximately 577 NM east-southeast of Yokosuka, Japan

https://www.metoc.navy.mil/jtwc/products/wp1426.gif

Tropical cyclone 13W (Peilou)…is located approximately 229 NM south-southeast of Iwo To

https://www.metoc.navy.mil/jtwc/products/wp1326.gif

 

>>> Southwest Pacific Ocean: There are no active tropical cyclones

>>> North and South Indian Oceans / Arabian Sea: There are no active tropical cyclones

Here’s the link to the Joint Typhoon Warning Center (JTWC)



Interesting: Climate Change Isn’t Driving All Mountain Trees Higher, Global Study Finds

A new study published in Nature Climate Change reveals a more complex reality: some tree species are moving uphill, while others are shifting downhill, and the key to understanding these contrasting responses lies in how trees manage water.

In one of the largest analyses of its kind, an international team of researchers integrated tree-ring records from more than 121,000 trees representing 45 species, climate-growth data from 3,057 forest sites worldwide, hydraulic trait information, and global observations of elevational range shifts across 102 mountain tree species. Their findings show that a tree species’ hydraulic traits, physiological characteristics that regulate water transport, drought tolerance, and growth, are powerful predictors of how forests reorganize under climate change.

A co-author of the paper, Tim Rademacher, Director of UVM’s Proctor Maple Research Center, describes the significance of their findings: “This research explains why some tree species move uphill with climate warming while others do not, improving our ability to forecast future forest distributions and identify conservation priorities. Understanding how trees balance growth and drought resistance helps explain their responses to climate change and offers a roadmap for predicting tomorrow’s forests.”

Read More: University of Vermont