Glenn James

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

 

The latest update to this website was at 850pm Tuesday evening HST


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

0.89  Hanalei, Kauai 
0.98  Poamoho RG 1, Oahu
0.26  Molokai AP, Molokai
0.00  Lanai
1.31  West Wailuaiki, Maui
0.11  IPIF, Big Island


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

16  Nawiliwili, Kauai – NE
30  Oahu Forest NWR, Oahu – SE
29  Makapulapai, Molokai – E 
29  Kahului AP, Maui – NE
35  Puu Mali, Big Island – SW


Hawaii’s MountainsHere’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. 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

   Remnants of Tropical Cyclone 15E is moving more or less westward…there could be locally heavy rain arriving here in the islands next week


https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20262582150-20262590540-GOES18-ABI-HI-14-600x600.gif

Variable clouds across the state and over the offshore waters…there’s a clear slot to the east before the next wave of clouds arrive 

 

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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




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

503am, it’s clear here at my place. My low temperature here in upper Kula was 58 degrees, relative humidity 76%…and calm winds

905am, the morning has been sunny here on Maui, at least for the most part, with the usual low clouds banked up against the windward coasts and slopes.

1225pm, cloudy with light rain here in upper Kula, although I was down in Paia shopping just now, and it rained heavily, at least at times coming back here to Kula. I can see muted sunshine down along the leeward beaches in contrast.

6pm, partly cloudy, with some of the cumulus clouds rising a bit higher than usual…they have more verticality.

635pm, the afternoon clouds are clearing nicely, and I can see that sliver of moon too…along with some haze down in the central valley.

852pm, it’s foggy here in upper Kula with the temperature here at my place a mild 65.8 degrees

 

>>> Youtube music video of Joni Mitchell…singing “Both Sides Now

 

Wondering whether this autumn and winter will be drier or wetter than normal here in Hawaii? Well, it looks like it could be markedly drier than normal. This doesn’t mean that there won’t be any cold fronts or upper level lows, that will bring some good moisture, just fewer than we’d likely prefer.

 

Hawaii’s Weather Highlights…as of Tuesday evening: Moderate trades will strengthen to moderate to breezy Wednesday and hold into the weekend. Moisture will increase across the state from east to west tonight into Friday, increasing chances of showers mainly for windward and mauka areas.

Chances of heavy rain, isolated thunderstorms and flood potential will increase Thursday into Friday, as an upper level disturbance moves overhead. Drier air will move back in by the weekend as trades continue. Moisture from the remnants of Tropical Depression 15E may bring another round of enhanced trade showers early next week

Weather Narrative…as of Tuesday evening: Radar and satellite show light to moderate showers over mauka areas of Oahu and portions of Maui County. A cluster of moderate showers remains upstream of Kauai. The highest rainfall totals through the day were observed at West Wailuaiki, Maui, with 1 inch of rainfall in the past 3 hours. Oahu windward areas received between .20 to .40 inches in the past 3 hours. Elsewhere mainly light showers were focused along windward and mauka areas. Gentle to moderate trades were observed across the state.

A large area of enhanced moisture as seen in the precipitable water imagery is still making its way across the state from east to west. Thus, expect and increase in scattered light to moderate showers tonight that will focus primarily along windward and mauka areas. Although upper level ridging should limit the potential of heavy showers, brief heavy showers cannot be ruled out overnight especially for Kauai, as the cluster of enhanced showers moves over the complex terrain.

An upper level trough will sink down over the state Wednesday afternoon and evening, just as the deepest surge of moisture from remnants of former Norbert begins to move across the state. This will result in a definite increase in moderate to heavy showers from late Wednesday night through early Friday. Instability will be sufficient for an isolated thunderstorm as well. A flood watch may be needed for Thursday, but could be issued as early as Wednesday.

Moisture will decrease late Friday through the weekend. Latest guidance remains on track, showing another area of increasing moisture (from the remnants of tropical depression 15E) will likely move into the area Monday or Tuesday next week. The GFS model shows better upper level support that could enhance the trade showers, while the ECMWF model shows mid level ridging that could help limit heavy shower potential…stay tuned.

Fire Weather: Fire weather risk should remain low through the remainder of the week due to moderate winds and increased relative humidity and moisture from the remnants of Norbert. Showers will dramatically increase late Wednesday into early Friday. Inversion heights from Maui to the Big Island will be elevated around 7,500 to 8,500 feet.

 

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 MapLooping Surface Precipitation…through the next 8-days / Vog Map

 

Marine Conditions…as of Tuesday evening: Prominent low pressure south of the islands maintains fresh trades from tomorrow onward. A Small Craft Advisory will be needed for Wednesday and potentially beyond. Remnants of TC Norbert will bring isolated thunderstorms to area waters Thursday night through Friday night.

Long period energy out of the south to southwest fills in during the latter half of the week supporting building surf for south shores. Surf is initially small through Wednesday but will trend upward toward the High Surf Advisory threshold by this weekend. Surf along east shores will modestly increase in response to building trades and a brief medium period E swell emanating from former TC Norbert. North shores stay flat to tiny.

 

>>> Highest Temperature Tuesday, September 15, 2026 – 109 degrees at Rio Grande Village, Texas


>>>
Lowest Temperature Tuesday, September 15, 2026 – 15 degrees at Peter Sinks, UT

 

Hawaiian Islands | Hawaii Landscape Photography | Scott Smorra


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 Subtropical Atlantic:

A trough of low pressure located about 600 miles east-southeast of Bermuda continues to produce disorganized showers and thunderstorms. Environmental conditions are forecast to become a little more conducive for development in a couple of days while the system moves slowly westward to west-northwestward over the subtropical Atlantic.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…30 percent 


Caribbean Sea:
There are no active tropical cyclones


Gulf of America:
There are no active tropical cyclones

 

Northeast Pacific:

Remnants of Tropical Cyclone 15E…is located about 1155 miles west-southwest of the southern tip of Baja, CA – Last Advisory

DEPRESSION DISSIPATES

According to the NHC advisory number 10…

The remnants are moving toward the west-southwest near 12 mph and this motion is expected to continue through the next day or so. Maximum sustained winds are near 30 mph with higher gusts. Gradual weakening is expected through Wednesday as the remnants continue to decay.

cone graphic

 

Central North Pacific: There are no active tropical cyclones

 

Northwest Pacific Ocean:

Tropical Cyclone 24W…is located approximately 168 NM east of Saipan

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Southwest Pacific Ocean: There are no active tropical cyclones

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

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



Interesting: 
This Cookie Started Its Life as a Plastic Bottle

Specialized microbes transform inedible material into protein-rich snacks.

Plastic might be the last ingredient you would ever add to a cookie recipe. But a team of researchers is looking to change that. They’ve programmed yeasts to turn plastic and agricultural waste into edible proteins and flavoring molecules, creating a treat from trash. The technology not only offers a new upcycling method but could also sustain life in disaster zones or even deep-space missions with humans aboard.

The researchers will present their results at the fall meeting of the American Chemical Society (ACS) during the “Undergraduate and Graduate Research in Biochemistry and Chemical Biology” symposium in McCormick Place.

As the world struggles with growing plastic pollution and increasing concerns about food security, researchers are looking for ways to turn one problem into a means of solving the other. So, a team from Southern Illinois University (SIU) Carbondale has put microbes to the test to transform plastic waste into edible food for humans. The work was conducted as part of a project led by NASA aimed at creating food for the resource-limited environment of deep-space exploration.

Read More: American Chemical Society

Image: This cookie is made using waste plant materials and plastic and could feed humans everywhere from submarines to spaceships.