Glenn James

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

 

The latest update to this website was at 649am Thursday morning HST


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

4.52  Kilohana, Kauai 
1.03  Manoa Lyon Arboretum, Oahu
0.64  Puu Alii, Molokai
0.00  Lanai
2.15  West Wailuaiki, Maui
3.01  Laupahoehoe PD, Big Island


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

22  Port Allen, Kauai – ENE
42  Oahu Forest NWR, Oahu – NE
31  Makapulapai, Molokai – ENE 
44  Kealaloloa Rg, Maui – NE
25  Upolu AP, Big Island – ENE


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.


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Big Blue…click twice for largest version

 

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


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Moisture associated with former Tropical Cyclone Norbert moving through the state from the east 

 

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Localized Showers…some heavy 

 

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

513am, it’s clear here at my place. My low temperature here in upper Kula was 62.5 degrees, relative humidity 80%…and calm winds

 

>>> Former Norbert according to the NWS Weather Prediction Center: Norbert’s remnants engulf the state today, keeping winds brisk with moderate to heavy showers overtaking the Hawaiian Islands into Friday. Excessive rainfall rates are possible along many of the windward slopes of the islands, with flooding impacts possible as precipitable water values reach 2.00-2.20? inches. By the weekend, Norbert’s low-level swirl will exit to the west, but above average moisture remains, leading to windward/mauka showers with heavier rainfall than usual.


>>>
Former 15E according to the NWS Weather Prediction Center: The remains of 15E move fairly close by to the south of the Hawaiian Islands from late Tuesday through next Thursday, increasing the intensity of rainfall — excessive rainfall/flash flooding is again possible and could be more expansive/intense. Precipitable water values could be higher than with Norbert — the GFS/ECWMF models advertise precipitable water values reaching 2.40-2.60?.



Hawaii’s Weather Highlights…as of Thursday morning: Moisture associated with the remnants of Norbert will move from east to west across the state through Friday, bringing an increase in shower activity, especially for windward and mauka locations. Some showers will be heavy at times with a slight chance of thunderstorms.

A Flood Watch remains in effect for all the Hawaiian islands through late tonight. Drier air will move back in this weekend behind the departing trough. Moisture from the remnants of Tropical Depression 15E may bring another round of enhanced trade showers by mid next week.

Weather Narrative…as of Thursday morning: Latest satellite imagery loop shows an area of enhanced moisture and cloud cover continuing to edge over the Big Island and Maui windward coasts from the east. This batch of moisture is associated the remnants of former tropical cyclone Norbert, which has been reduced to a surface trough extending from the Big Island northward. Over the next 24 hours, the trough will push westward across the remaining islands and bring with it a swath of relatively deep moisture with over 2″ of precipitable water.

At the same time, models show an upper level trough dropping over the islands. Marginal upper level instability, combined with abundant moisture in the lower levels, will be enough to aid in the development of heavier showers and isolated thunderstorms over mainly windward and mauka locations along with the Kona slopes on the Big Island. A Flood Watch remains in effect for all Hawaiian Islands through late tonight.

The trough will slowly depart to the west of the state on Friday, but some residual moisture may be enough for heavier showers to stick around near Kauai. Atmospheric instability, produced by diurnal heating, could lead to another round of enhanced showers and isolated thunderstorms Friday afternoon over leeward slopes of the Big Island.

Saturday through next Monday, moderate trades will help filter drier air back into the lower levels, and reduce the shower coverage to scattered during mainly the late night/early morning hours. The aforementioned upper level trough, or possibly weak upper level low, will sit stagnant near Kauai and help carry some mid and upper level cloudiness over the state from the southwest.

Tuesday through next Thursday, there is yet another potential push of deeper moisture from the remnants of tropical depression 15E. Both the GFS and ECMWF models show a low level trough associated with this moisture passing near or over the islands. This event is still well into the long range forecast, so confidence is rather low. However, it will still need to monitored closely for the potential of more heavy rain.

Fire Weather:  Fire weather risk should remain low through Friday due to moderate to breezy winds and increased relative humidity and moisture from the remnants of Norbert. Showers will decrease by this weekend. Inversion heights will be elevated or very weak.

 

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

 

Marine Conditions…as of Thursday morning: A broad trough, associated with the remnants of Norbert, will allow moderate to locally strong northeast trades to hold through today. A Small Craft Advisory (SCA) for the typical windy waters around Maui and the Big Island is in effect. This SCA may be expanded to include other areas in the coming days.

After the trough moves through the state through early Friday, a surface high far northeast of the state could allow moderate to locally strong trades to return over the weekend. Above normal moisture and upper level support will allow isolated thunderstorms with localized heavy rain and gusty outflows to develop over the offshore waters through Saturday.

A series of long to medium period south-southwest swells will continue dropping. Surf along south facing shores should begin to see more consistent sets today to near average levels. A reinforcing southerly swell will fill in Friday, bumping surf to near High Surf Advisory thresholds by this weekend, as swells shift more out of a south direction.

Surf along east-facing shores increases today into Thursday as trade winds strengthen and a small, medium-period east swell from the remnants of Norbert arrives. Flat to tiny surf along north facing shores is expected through the forecast period.

 

>>> Highest Temperature Wednesday, September 16, 2026 – 106 degrees at La Puerta, Texas


>>>
Lowest Temperature Wednesday, September 16, 2026 – 22 degrees near Mackay, ID

 

Hawaii Weather, Eruptions & Travel Mistakes to Avoid on Your Next Trip - Hawaii Aloha Travel


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:

Invest 98L

Showers and thunderstorms associated with a low pressure area located about 350 miles east of Bermuda have changed little in organization during the past several hours. Environmental conditions could support gradual development of the system during the next day or two, and a tropical depression could form during that time. The system is forecast to move slowly today, and then possibly turn southward on Friday over the subtropical Atlantic. By Sunday, environmental conditions are forecast to become less favorable for development.

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


Caribbean Sea:
There are no active tropical cyclones


Gulf of America:
There are no active tropical cyclones

 

Northeast Pacific:

Western East Pacific:

>>> A tropical wave continues to produce disorganized showers and thunderstorms well to the south-southwest of the southern tip of the Baja California Peninsula. Environmental conditions appear conducive for gradual development of this system, and a tropical depression is likely to form this weekend or early next week as it moves westward at 10 to 15 mph across the western part of the East Pacific.

* Formation chance through 48 hours…low…20 percent
* Formation chance through 7 days…high…70 percent 

 

>>> Well East-Southeast of the Hawaiian Islands (Former TD 15E):

Showers and thunderstorms have increased somewhat with an area of low pressure related to the remnants of Tropical Depression 15E. Environmental conditions appear only marginally conducive for some development of this system as it moves gradually westward, remaining east-southeast of the Hawaiian Islands.

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

 

Southwest of Southwestern Mexico:

Another tropical wave is producing disorganized showers and thunderstorms several hundred miles south of southwestern Mexico. Environmental conditions also appear conducive for gradual development of this system, and a tropical depression is likely to form late this weekend or early next week while it moves gradually northwestward turning northward off the coast of southwestern Mexico.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…high…80 percent 

 

Central North Pacific: There are no active tropical cyclones

 

Northwest Pacific Ocean:

Tropical Cyclone 24W (Dujuan)…is located approximately 404 NM east of Iwo To

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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: 
MIT Spinout Turns Plastic Waste into Resilient Building Materials

The world needs more homes. The world also has too much plastic. Perhaps the only thing those two problems have in common is that they’re hard to solve.

Atlas Building Composites, a spinout of MIT, is on a mission to address both problems with a single solution. The company has developed an AI-powered robotic manufacturing platform capable of turning single-use plastics into durable building materials.

The company emerged from MIT HAUS, a research effort in the MIT Department of Mechanical Engineering that’s short for “Home Architecture for Universal Sustainability.” Atlas uses waterless plastic recycling and large-scale composite additive manufacturing technology to make parts like home foundations, decks, and trusses for walls, floors, and roofs.

Read More: Massachusetts Institute of Technology

Atlas Building Composites, an MIT spinout, recently supplied the U.S. Army Corps of Engineers with American-made recycled composite trusses to construct a 40-foot bridge in a Massachusetts wetland, pictured.