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

 

The latest update to this website was at 819pm Tuesday evening HST


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

1.15  Mount Waialeale, Kauai
0.65  Tunnel RG, Oahu
0.11  Puu Alii, Molokai
0.01  Lanai 1, Lanai
0.46  West Wailuaiki, Maui
1.53  Pohakuloa Kipuka Alala, Big Island


The following numbers represent the strongest wind gusts (mph) Tuesday evening: 

15  Port Allen, Kauai – E 
22  Kii, Oahu – SE
30  Makapulapai, Molokai – E
m   Lanai – m
31  Kealaloloa Rg, Maui – NNW 
38  Puuloa, Big Island – NE


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.

https://weather.gc.ca/data/satellite/goes_gwdisk11_1070_100.jpg

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…tropical disturbance brewing (93C)

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20262232050-20262240440-GOES18-ABI-HI-14-600x600.gif

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

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

Localized showers…very few 

 

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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 Tuesday comments:  I’m at home here in upper Kula, Maui, Hawaii

505am, it’s mostly clear here in upper Kula with calm winds, and a low temperature at my place of 56.5 degrees…with the relative humidity 81%

102pm, lots of high cirrus clouds, with a rather limited amount of low cumulus clouds here in Maui County.

443pm, it’s cloudy here in upper Kula, although it doesn’t have a feeling of showers at the moment.

827pm, the afternoon clouds are trying to clear, and as such my temperature here in upper Kula has dropped to 62.7 degrees

 

>>> 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 is a high likelihood that we will see one such system coming our way later this week…more information on this possibility just below:

Central North Pacific: There are no active tropical cyclones

Invest 93C

Visible satellite imagery indicates that a well-defined low-level center has formed in association with the low pressure system located about 1050 miles east-southeast of the Hawaiian Islands. However, the shower and thunderstorm activity remains disorganized. Environmental conditions are conducive for further development, and a tropical depression or storm is expected to form on Wednesday while the system moves generally west-northwestward at around 15 mph. Interests in the Hawaiian Islands should closely monitor the progress of this system.

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

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/tpw/13/1800x1080.jpg

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>>> Later this week, all eyes will be on the track of the tropical disturbance 93C. The National Hurricane Center continues to have this disturbance with a 90% chance of developing into a tropical cyclone at some point over the next 7-days. The track of 93C will be critical, and unfortunately the guidance in the past 24 hours have painted a near worst-case scenario for the islands.

The suite of hurricane models have come into rather impressive agreement, both on the track and the timing. The Hawaiian Islands remain right in the middle of the guidance suite as to where the center of the storm will track. A couple pieces of good news is the guidance has slowed the approach of the center of the storm, which now looks to arrive to around the Big Island on Saturday evening instead of Friday evening.

Secondly, the intensity guidance has not increased much, if at all, in the past 24 hours, with the middle of the intensity suite honing in on a strong tropical storm as the center moves across the islands. Thus, it appears likely that there will be impacts from this storm this weekend. The track of the storm as it moves through the islands will be the determining factor as to how significant the impacts will be.

The typical impacts from a nearby tropical cyclone can be expected…likely for all the islands. These include heavy rain causing flash flooding, gusty winds capable of causing damage to infrastructure, storm surge, and a low likelihood of tornadoes. Thus, it will be very prudent to keep an eye on the forecast in the coming days for the latest updates.

When 93C develops into a Tropical Storm or Hurricane, it will take on the name Lala

 

>>> Highest Temperature Tuesday, August 11, 2026 – 116 degrees at Stovepipe Wells, CA


>>> Lowest Temperature Tuesday, August 11, 2026 – 30 degrees near Bynum, MT

 

Hawaii’s Weather Highlights…as of Tuesday evening: Moderate to locally breezy trade winds will continue through the next few days, with a gradual strengthening expected Thursday into Friday. Mostly dry conditions will continue to persist through Friday, with some some passing showers over windward and mountain areas.

As we head into the weekend, the main weather concern will be related to the tropical cyclone development of 93C, currently over 1000 miles east-southeast of the state. Residents and visitors should prepare now for potential tropical cyclone impacts this weekend.

Weather Narrative..as of Tuesday evening: Satellite imagery continues to show a dry summertime weather regime, with a few showers over windward areas, and the kona slopes of the Big Island. Hilo and Lihue atmospheric soundings show a strong inversion at around 4,500-5,000 feet, which is about 1,000 feet lower than normal, and in line with the drier conditions. Mostly dry conditions are expected to continue through Friday with a few scattered showers riding in with the trade winds from time to time.

The main concern over the next 7 days will be related to the area of potential tropical development currently over 1000 miles east-southeast of the state. The National Hurricane Center (NHC) continues to report that the area is conducive for tropical development with a 90 percent chance of development over the next 48 hours.

While confidence is fairly high for the state to be impacted by a tropical cyclone this weekend, the severeness of the impacts remain very uncertain due to lack of formation at this time. Once the system becomes better organized, we should have higher confidence in the weather impacts. But until then, here is a list of potential hazards that we could see this weekend:

STRONG AND GUSTY WINDS… Winds could strengthen further on Saturday, though the timing, direction, and magnitude of the strongest winds remain highly dependent on the eventual track and intensity of the system. Even if the center of the system remains away from the islands, the north semicircle of the storm will likely produce damaging winds.

HEAVY RAINFALL… This system could bring periods of heavy rainfall, particularly across east and southeast-facing slopes. Orographic enhancement could result in locally higher rainfall totals where moist tropical flow interacts with island terrain. If heavier rainfall persists over the same locations, flash flooding and rapidly rising streams are possible.

LARGE AND ROUGH SURF… The developing system is expected to generate a large easterly swell as it moves northwestward across the Central Pacific. Surf may build along east-facing shores from east to west as the system approaches, with Warning-level surf possible into the weekend.

Fire Weather: High pressure to the northeast of the state will maintain moderate to locally breezy trades over the next few days. A pocket of drier air is expected to move in on Wednesday, which will bring afternoon humidities down to near critical thresholds Wednesday afternoon, although winds will remain moderate to locally breezy. Fire weather concerns could increase further on Friday as the trade winds strengthen to strong speeds. The combination of dry weather and breezy to locally strong trade winds will create near-critical fire weather conditions on Friday. Temperature inversion heights will range between 4,500 to 6,000 feet over the next few days.

 

https://www.weather.gov/images/hfo/graphics/npac.gif


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 Tuesday evening: High pressure to the far northeast will slowly drift into position north of the Hawaiian Islands into the weekend, producing moderate to locally strong trade winds across the region. The Small Craft Advisory (SCA) has been extended through Wednesday afternoon for the windier waters and channels around Maui and the Big Island.

The weather pattern may change significantly this weekend as we continue to watch for a developing tropical cyclone currently in an area roughly 1,000 NM east-southeast of the Hawaiian Islands. Potential impacts are uncertain at this time, as the tropical cyclone has not yet formed and track guidance remains highly uncertain at this time. Marine interests should be prepared in case this system potentially turns towards the Hawaiian Islands after formation potentially as early as this weekend.

Surf along south and west facing shores will continue to remain elevated, as overlapping south swells continue to impact the islands with some smaller wrap around energy, along increasing surf heights along exposed west facing shores. A slightly bigger south swell will build in as another moderate, long period south swell arrives, peaking just below advisory thresholds by Wednesday, and then remaining elevated through Friday.

Surf along east facing shores will continue to remain moderate and rough due to continued trade winds. Later in the week, the track of a developing tropical cyclone will dictate the potential for a large swell exceeding advisory levels from the east to southeast direction. 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 around the afternoon high tide through Wednesday. Tides will be decreasing by the end of this week, but coastal flooding may continue to be possible around high tide for locations where water levels are running highest.

 

Throwback to Maui, Hawaii, USA ?? Looking forward to heading back later this year! @fsmaui


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:

Invest 92L

Showers and thunderstorms continue to show signs of organization in association with a tropical wave located around 800 miles southwest of the Cabo Verde Islands. Environmental conditions are forecast to be conducive for development during the next few days, and a tropical depression will likely form within a couple of days while the system moves westward to west-northwestward across the central tropical Atlantic.

* Formation chance through 48 hours…high…70 percent
* Formation chance through 7 days…high…80 percent

 

Central Subtropical Atlantic:

Invest 93L

Recent satellite wind data indicate that the broad low-pressure area located about 1000 miles east-northeast of Bermuda has developed gale-force winds. However, the circulation is elongated and the associated convection has become a less organized during the past few hours. Some development of this system is possible through tonight, and a short-lived tropical storm could form while it moves eastward to east-northeastward at around 20 mph across the central subtropical Atlantic. The system is forecast to reach cooler waters by Thursday, ending its chances of formation.

* Formation chance through 48 hours…medium…50 percent
* Formation chance through 7 days…medium…50 percent

 

Eastern Tropical Atlantic:

A tropical wave just offshore of the coast of west Africa is producing disorganized showers and thunderstorms. Environmental conditions are forecast to be generally conducive for some development of this system during the next several days while it moves westward or west-northwestward across the eastern and central tropical Atlantic.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…20 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

Invest 99E

A low pressure system located about midway between Hawaii and the west coast of Mexico is producing disorganized shower and thunderstorm activity. Any significant increase in the organization of the showers and thunderstorms would result in the formation of a tropical depression on Wednesday. The system is forecast to move northwestward at 5 to 10 mph over the next couple of days and encounter less favorable environmental conditions late this week.

*Formation chance through 48 hours…high…70 percent
*Formation chance through 7 days…high…70 percent

 

Central North Pacific: There are no active tropical cyclones

Invest 93C

A low pressure area is located about 1050 miles east-southeast of the Hawaiian Islands. While the center is well-defined, the shower and thunderstorm activity is currently disorganized. Environmental conditions are conducive for further development, and a tropical depression or storm is expected to form on Wednesday while the system moves generally west-northwestward at around 15 mph. Interests in the Hawaiian Islands should closely monitor the progress of this system.

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

 

>>> Northwest Pacific Ocean:

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

Tropical cyclone 14W (Chan-hom)…is located approximately 79 NM west-northwest of Camp Fuji – Final Warning

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

 

Tropical cyclone 13W (Peilou)…is located approximately 534 NM northeast of Minami Tori Shima

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: Heatwaves Also Hit the Ocean. Why?

Just like on land, the ocean environment can experience heatwaves. These periods of abnormally high ocean temperatures can last for weeks or even months, with potentially severe ecological and economic consequences.

Researchers from the Nicholas School of the Environment have identified a connection between marine heatwaves and moving bands of moisture in the air, called atmospheric rivers. Their study, funded by NASA, could potentially lead to improved predictions of marine heatwaves and a better understanding of how climate change factors in.

Atmospheric rivers spend ample time over oceans, where they can influence sea surface temperatures through various processes that move heat around. The researchers wanted to see if interactions between atmospheric rivers and the sea surface might play a role in marine heatwaves.

Read More: Duke University