Glenn James

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

 

The latest update to this website was at 750pm Tuesday evening HST


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

0.22  Common Ground, Kauai
0.64  Moanalua RG, Oahu
0.49  Puu Alii, Molokai
0.01  Lanai 1, Lanai
1.40  West Wailuaiki, Maui
1.09  Piihonua, Big Island


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

24  Port Allen, Kauai – ENE
30  Kuaokala, Oahu – NE
35  Makapulapai, Molokai – E 
45  Na Kula, Maui – ESE 
47  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.


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Big Blue…click twice for largest version

 

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Tropical systems remain active in the eastern Pacific…including Tropical Storm Odalys and Category 5 Major Hurricane Polo…along with soon to be a TC near Hawaii  


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Variable low clouds are present over the island chain…thunderstorms south-southeast

 

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

445am, it’s mostly clear here at my place, with the low temperature 59 degrees, relative humidity is 82%…with calm winds

5pm, summer  is over and autumn has begun…at least on the calendar.

630pm, it’s mostly cloudy and humid here on Maui…along with a fair amount of haze.

 

The latest update:

>>> Southeast of the Hawaiian Islands:

(Former TD 15E)

Showers and thunderstorms associated with the remnants of Tropical Depression Fifteen-E, located roughly 430 miles south-southeast of South Point, Hawaii, are gradually becoming better organized. Environmental conditions are conducive for development, and a tropical depression is expected to form in a day or so, while the system moves slowly west-northwestward. Heavy rains associated with this system are forecast to spread over the southeastern Hawaiian Islands starting on Wednesday and continuing through Saturday, possibly resulting in life-threatening flash flooding and mudslides for portions of the Big Island and Maui. Interests in the Hawaiian Islands should continue to monitor the progress of this system.

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

 

>Flash flooding potential increases Wednesday through Friday as moisture associated with remnants of 15-E tracks just south of the Big Island.
> Southeast Big Island will likely see the highest rainfall totals 15 to 20”. Leeward areas in the 4 to 8″ range.
>East Maui, potential for 4 to 8″

 

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Hawaii’s Weather Highlights…as of Tuesday evening: Moderate trades will gradually strengthen each day over the next several days with widespread strong trades expected by Thursday, and very windy conditions possible on Friday. The main focus for the weather this week will be the tropical cyclone development southeast or south of the Big Island over the next few days.

While the potential wind impacts remain uncertain, the threat for flash flooding will increase. A flood watch has been issued from noon Wednesday to 6pm Saturday for Maui County and the Big Island.

Weather Narrative…as of Tuesday evening: Radar and satellite showed the usual conditions for a trade wind regime…with mostly cloudy skies and isolated to scattered showers windward and mauka, and mostly sunny skies leeward. Winds were averaging 10 to 20 mph in most areas, with the typical windiest spots blowing 15 to 25 mph with gusts 25 to 40 mph.

The latest guidance has not changed the overall expectations for TD 15E (future Nolo). Models show a wide variety of solutions, with some moving Nolo over part(s) of the state, but most missing a direct landfall. Showers and/or isolated thunderstorms are expected to begin to bring heavy rain, especially to the windward and southeast sections of the Big Island and windward Maui beginning Wednesday.

Models continue to show Nolo forming southeast of the Big Island, and then moving slowly northwest and then north toward the Big Island. Therefore, there is increasing confidence that heavy rain will be possible throughout the second half of this week. In fact, it is conceivable that the watch may even be extended into Sunday.

Of course, the exact track will determine how long heavy rain will last, and how much total rainfall occurs. At this time, there is a large amount of uncertainty in the forecast track. Because the storm is expected to begin to form tonight into Wednesday, we could see some convergence in solutions during that time. But with weak steering flow, it’s likely that there will continue to be a large uncertainty in the track, as we move through the next few days. For now, the main concerns are heavy rain and increasing winds.

Winds could become advisory or even warning level if Nolo intensifies sufficiently, most likely Friday into the weekend. These are being held off for the winds at this time, as we may also be under tropical storm or hurricane watches or warnings by then.

Fire Weather:  Breezy trades will return by this afternoon and steadily strengthen each day over the next several days. With winds strengthening, moderate fire weather conditions will be possible this week mainly over drier leeward areas. The inversion is around 5,000 feet, but will rise over the eastern end of the state Wednesday as deeper moisture moves in.

 

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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 Tuesday evening: The gradient between high pressure to the northeast and an approaching trough that may develop into a tropical cyclone to the southeast, will maintain moderate to locally strong trade winds through Wednesday. A Small Craft Advisory is in effect for the typical windy waters of Maui County and the Big Island through early Wednesday evening, with the possibility of it being extended as well as expanded. Wind speeds will strengthen during the latter half of the week, as the trough or potential tropical disturbance moves near the islands. Shower coverage will also increase, along with the potential for isolated thunderstorms, particularly across the eastern waters.

Surf along south facing shores will gradually drop heading into mid-week as the current south-southwest swell fades. A slightly smaller, long-period south-southwest swell will fill in late this week into the weekend generated by a series of lows near New Zealand. West facing shores will experience a bit of the southerly wrap through most of the week.

Breezy trade winds will maintain moderate surf along east facing shores for the next several days. Surf along north facing shores will see a rise today into Wednesday as a small, medium-period, north-northwest swell fills in from an Aleutian low. Then a small, long-period west-northwest swell generated by Typhoon Dujuan as it curves northeast near Japan, will build locally Friday into the weekend, increasing surf along north and west facing shores.

 

>>> Highest Temperature Tuesday, September 22, 2026 – 104 degrees near La Puerta, Texas


>>>
Lowest Temperature Tuesday, September 22, 2026 – 20 degrees near Big Bay, MI

 

Hawaiian Vibes


World-wide Tropical Cyclone Activity

 



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




Atlantic Ocean: 

Post-Tropical cyclone 06L (Fay) – Last Advisory

FAY DEGENERATES TO A REMNANT LOW PRESSURE AREA

The post-tropical cyclone is moving toward the west-southwest near 9 mph. A gradual turn toward the west is expected during the next few days. Maximum sustained winds are near 35 mph with higher gusts. The remnant low is expected to gradually weaken during the next few days. The estimated minimum central pressure is 1011 mb (29.86 inches).

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>>> Far Eastern Tropical Atlantic:

A tropical wave is forecast to move off the coast of western Africa later tonight or tomorrow. Although upper-level winds are not very conducive for development, a tropical depression could form while it moves generally northwestward across the far eastern Atlantic. Interests in the Cabo Verde Islands should monitor the progress of this system as gusty winds and areas of heavy rain are possible there by the end of the week.

* Formation chance through 48 hours…low…20 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:

Tropical cyclone 16E (Odalys) is located about 1345 miles west-southwest of the southern tip of Baja California

 

ODALYS FORECAST TO BECOME A HURRICANE LATER TONIGHT

According to the NHC advisory number 12

Odalys is moving toward the east-northeast near 9 mph An eastward to east-northeastward motion at a slightly slower speed is expected through the next couple of days, followed by a gradual turn toward the northeast then north later this week. Maximum sustained winds are near 70 mph with higher gusts. Additional strengthening is expected, and Odalys is forecast to become a hurricane later tonight. Tropical-storm-force winds extend outward up to 150 miles from the center. The estimated minimum central pressure is 994 mb (29.36 inches).

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Tropical cyclone 17E (Polo) is located about 355 miles southeast of Manzanillo, Mexico

POLO CONTINUES DRIFTING SLOWLY AS AN EXTREMELY DANGEROUS CATEGORY 5 HURRICANE

According to the NHC advisory number 10

Polo is drifting toward the northeast near 1 mph. A slow but sharp turn to the northwest is expected to begin tonight followed by a general west-northwestward motion over the next few days. On the forecast track, the core of Polo is expected to be near the coast of southwestern Mexico through the middle of this week, although it is forecast to remain offshore. Maximum sustained winds are near 165 mph with higher gusts. Polo is a category 5 hurricane on the Saffir-Simpson Hurricane Wind Scale. Fluctuations in intensity are expected over the next few days, though Polo is expected to remain a very powerful major hurricane. Hurricane-force winds extend outward up to 40 miles from the center and tropical-storm-force winds extend outward up to 105 miles. The estimated minimum central pressure is 905 mb (26.73 inches).

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>>> South of the Gulf of Tehuantepec:

An area of low pressure is expected to form in the next few days to the south of the Gulf of Tehuantepec. Afterwards, environmental conditions should be favorable for gradual development, and a tropical depression could form late this week or this weekend as the system moves slowly west-northwestward to northwestward. This motion should keep it parallel to the coast of southern and southwestern Mexico.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…high…70 percent

 

Central North Pacific: There are no active tropical cyclones

>>> Southeast of the Hawaiian Islands:

(Former TD 15E)

Showers and thunderstorms associated with the remnants of Tropical Depression 15E, located roughly 430 miles south-southeast of South Point, Hawaii, are gradually becoming better organized. Environmental conditions are conducive for development, and a tropical depression is expected to form in a day or so, while the system moves slowly west-northwestward. Heavy rains associated with this system are forecast to spread over the southeastern Hawaiian Islands starting on Wednesday and continuing through Saturday, possibly resulting in life-threatening flash flooding and mudslides for portions of the Big Island and Maui. Interests in the Hawaiian Islands should continue to 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:

Tropical Cyclone 24W (Dujuan)…is located approximately 424 NM east of Misawa, Japan – Final Warning

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Southwest Pacific Ocean: There are no active tropical cyclones

 

North and South Indian Oceans / Arabian Sea:

Tropical Cyclone 01B…is located approximately 359 NM southwest of Kolkata, India

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



Interesting: 
Drought in the Northeastern United States Has Decreased

Study finds increased precipitation outpaces water loss from warmer temperatures.

As climate change continues to impact the U.S., many regions throughout the country, especially the West, are experiencing more drought.

But over the last century, the Northeast has experienced something different—less frequent and less intense droughts due to increased precipitation, according to a new Dartmouth study.

The findings are published in the Journal of Hydrometeorology.

Read More: Dartmouth College