Glenn James

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

 

The latest update to this website was at 1048am Friday morning HST


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

2.22  Kilohana, Kauai
1.58  Manoa Lyon Arboretum, Oahu
1.04  Puu Alii, Molokai
0.01  Lanai City, Lanai
3.02  Puu Kukui, Maui
5.18  Honolii Stream, Big Island


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

22  Port Allen, Kauai – NE
31  Oahu Forest NWR, Oahu – E
31  Makapulapai, Molokai – E 
38  Kealaloloa Rg, Maui – NNE
48  Puuloa, Big Island – NW


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

 Heavy showers and thunderstorms to the south of the state


https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/13/20262611210-20262612000-GOES18-ABI-HI-13-600x600.gif

Moisture associated with former Tropical Cyclone Norbert is over the state (brightest colors are where the heaviest rains are located) 

 

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

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

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

Localized Showers…some are heavy  

 

https://www.weather.gov/wwamap/png/hfo.png

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

519am, it’s partly cloudy here at my place, and there’s been flickering lightning flashes most of the night into early this morning…although the thunderstorms were too far away for me to hear thunder. My low temperature here in upper Kula was 62.5 degrees, relative humidity 85%…and calm winds



Hawaii’s Weather Highlights…as of Friday morning: A surface trough, along with moisture associated with the remnants of Norbert will continue to move westward across the state today, bringing more enhanced showers and a slight chance of thunderstorms to mainly the western end of the state. Some thunderstorm activity will also be possible this afternoon over the Kona slopes on Big Island. 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 the middle of next week.

Short Term Update: Thunderstorm activity has been limited to the offshore waters so far this morning, although we need to watch out for the possible development over the Kona slopes this afternoon.

Weather Narrative…as of Friday morning: Satellite loop shows convection with frequent lightning roughly 60 miles southwest of Maui. This activity is due in part to deeper moisture associated with a north to south oriented surface trough draped over the western end of the state, and weak instability aloft stemming from an upper level trough. These features could help to bring at least some enhanced showers to the islands today, especially over windward and mauka locations.

Kauai, located closest to the departing surface trough, may see the best chance of receiving heavy showers. Atmospheric instability generated by daytime heating could lead to more showers and a slight chance of thunderstorms this afternoon over the Kona slopes on Big Island. That being said, overall instability and precipitable water values are forecast to be less than yesterday, so confidence of occurrence is slightly deflated. High resolution models, such as the WRF ARW and WRF FV3, also indicate very little in the way of widespread heavy precipitation today. Thus, the Flood Watch for all islands has been cancelled. If any flooding does occur, it would likely be an isolated event.

Saturday through Monday, moderate trades will help filter drier air back into the lower levels, for more isolated to scattered coverage of showers during the nights or early morning hours along windward areas.

Tuesday through Thursday, there is yet another potential push (by way of moderate trades) of deeper moisture from the remnants of Tropical Depression 15E. The GFS model indicates precipitable water values could peak out between 2.00″ and 2.25″ across the southeast half of the state, while the ECMWF model shows between 2.00″ and 2.50″. These values are far above seasonal norms. A trough passing just south of the islands may provide additional lift and instability for more widespread and heavier showers.

Fire Weather:  Fire weather risk will remain low today 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 today.

 

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 Friday morning: Moisture from the remnants of Norbert and a trough aloft, will bring a few thunderstorms through this morning. Trade winds will strengthen slightly through this weekend, and maintain through at least the first half of next week. A Small Craft Advisory is posted for the typical windy waters around Maui County and Big Island through tonight, and will continue into next week for these waters.

A south swell will fill in today and surf will reach near advisory levels by Saturday. Surf along east-facing shores will maintain over the next several days as the east swell from Norbert declines, but it will be replaced by chop from the building trade winds. Flat to tiny surf along north facing shores is expected through the forecast period.

 

>>> Highest Temperature Thursday, September 17, 2026 – 104 degrees at Chickasha, OK


>>>
Lowest Temperature Thursday, September 17, 2026 – 24 degrees near Old Station, CA

 

Hawaii Weather Today » Hawaiian Islands Weather Details & Aloha Paragraphs / February 25-26, 2018


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

>>> Eastern Subtropical Atlantic:

Invest 99L

Recent satellite imagery indicates that showers and thunderstorms are becoming better organized in association with an area of low pressure located several hundred miles southwest of the Azores. In addition, it appears that a well-defined center is developing. If these current trends continue, a tropical depression could form as soon as later this afternoon. The system is expected to move slowly over the next several days remaining to the southwest of the Azores.

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


Caribbean Sea:
There are no active tropical cyclones


Gulf of America:
There are no active tropical cyclones

 

Northeast Pacific:

Western East Pacific:

Invest 98E

>>> Showers and thunderstorms associated with a broad area of low pressure located well southwest of the southern tip of the Baja California Peninsula remain disorganized. Environmental conditions appear conducive for additional development of this system, and a tropical depression is likely to form this weekend as it moves westward at 10 to 15 mph across the western East Pacific.

* Formation chance through 48 hours…medium…60 percent
* Formation chance through 7 days…high…80 percent 

 

>>> Well East-Southeast of the Hawaiian Islands:

(Former TD 15E)

Showers and thunderstorms associated with the remnants of Tropical Depression Fifteen-E, located more than 1000 miles east-southeast of the Hawaiian Islands, have increased somewhat this morning but remain disorganized. Environmental conditions appear conducive for some development of this system as it moves westward to west-southwestward, and a tropical depression could form well to the south or southeast of the Hawaiian Islands by the middle to latter part of next week.

* Formation chance through 48 hours…low…10 percent  
* Formation chance through 7 days…medium…40 percent 

 

South of Southwestern Mexico:

A broad area of low pressure located about 800 miles south-southwest of the southwestern coast of Mexico is producing disorganized shower and thunderstorm activity. Environmental conditions are conducive for development, and a tropical depression is likely to form late this weekend or early next week while it moves gradually north-northwestward and northward off the coast of southwestern Mexico.

* Formation chance through 48 hours…low 20 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 42 NM north-northeast of Iwo To

https://www.metoc.navy.mil/jtwc/products/wp2426.gif

 

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: 
A New Approach to Forecasting Toxic Metals in Wildfire Smoke

In early July 2026, Stanford postdoctoral researcher Alex Honeyman and graduate student Mark Leone attached a box the size of a briefcase to a firetruck in Colorado that was about to be dispatched to a wildfire 300 miles away.

The box held a prototype array of air filters and satellite-linked sensors developed by Honeyman and Stanford colleagues to collect smoke samples and measure temperature, humidity, and toxic gases like carbon monoxide around the truck.

The devices provided the firetruck’s crew with real-time data through a smartphone app, helping them decide what gear to wear on scene, conveniently monitor data like humidity and temperature, and even calculate the probability that sparks could ignite another blaze. Developed at the Stanford Doerr School of Sustainability as part of a larger project called SmokeCast, the app also estimated the likelihood that soils within 10 miles of the fire could release toxic metals when exposed to extreme heat.

Read More: Stanford University