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

 

The latest update to this website was at 655am Monday morning HST


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

2.34  Mount Waialeale, Kauai
1.68  Manoa Lyon Arboretum, Oahu
0.62  Puu Alii, Molokai
0.08  Lanai City, Lanai
3.10  Puu Kukui, Maui
1.12  Honolii Stream, Big Island


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

25  Lawai, Kauai – NE
50  Oahu Forest NWR, Oahu – E 
33  Makapulapai, Molokai – E
m   Lanai – missing
40  Kealaloloa Rg, Maui – NNE
28  South Point, Big Island – NE


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 (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.


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Big Blue…click twice for largest version

 

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   Tropical cyclone 01C (Lala) far northwest…moving farther away / Tropical Cyclone 02C (Moke) southwest of Hawaii / Tropical Cyclone o9E (Iselle) offshore from Mexico although is heading west-northwest (which won’t be a threat to Hawaii)

 

https://www.nhc.noaa.gov/storm_graphics/CP01/refresh/CP012026_5day_cone+png/150554_5day_cone.png

cone graphic

cone graphic

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20262360630-20262361420-GOES18-ABI-HI-14-600x600.gif

 TC Moke southwest 

 

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Localized showers…some heavy around the Big Island 

 

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

449am, it’s clear to partly cloudy here at my place here in Kula with a low temperature of 62.5 degrees, and the relative humidity is 85%

 

Hawaii’s Weather Highlights…as of Monday morning:  Trade winds will ease slightly today as Tropical Depression Moke continues moving westward, south of the islands. Showers on the northern periphery of Moke will bring wet conditions and a risk of flash flooding on the Big Island, while less rainfall is expected to impact windward sections from Maui to Kauai over the next couple of days. Trade winds will drop to moderate strength on Tuesday, as Moke moves westward away from the area, with more typical trade wind weather returning for the remainder of the week.

Weather Narrative..as of Monday morning: Radar and satellite imagery shows scattered showers moving across the state. While mostly impacting windward and mauka spots, some showers are making it over into leeward locations. Moke is south- southwest of the Big Island, with deep moisture sheared to the north of the system, that is mostly skirting south of Big Island.

This has kept rainfall on the lighter side with no flash flooding threats overnight. However, a flood threat will continue through this afternoon. As Moke continues to move westward, low- to mid- level flow on the Big Island will veer out of the east to the east- southeast, which could optimize orographic (mountain) lift and increase rainfall on southeast slopes.

Afternoon showers could produce localized flooding across the Kona Districts. As such, the Flood Watch will be continued through this afternoon for the Big Island. Trades are slowly decreasing as Moke continues to move away from the state, allowing the pressure gradient to relax.

On Tuesday and through the rest of the week, a trade wind pattern will return. Trades should be at moderate strength with typical windward and mauka showers occurring.

 

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 Monday morning: Locally strong trades persist as Tropical Depression Moke passes south of the island chain, and broad high pressure remains north of the state. Convection associated with this system will remain over the southern portion of the offshore waters as it tracks west. The Small Craft Advisory has been extended for the typical windy waters of Maui County and the Big Island.

Elevated winds and short period fresh swell generated by TD Moke have peaked over the eastern half of the state. Surf along east and ESE facing shores continue trending down, as Moke advances westward. Conditions remain choppy, however, as trades persist.

Surf along south shores remains below summer norms, but still slightly elevated due a lingering small, long period SSW swell. A medium to long period south swell will arrive today into Tuesday, in maintenance of near-normal summertime surf. A similarly sized long period south swell is then poised to arrive mid-week, boosting surf toward the advisory threshold.

A small, medium to long period WNW swell, originating from Tropical Storm Lala, will fade during the next 24 to 36 hours.

 

>>> Highest Temperature Sunday, August 23, 2026 – 120 degrees at Death Valley, CA


>>>
Lowest Temperature Sunday, August 23, 2026 – 28 degrees near near Kirk, OR

 

The same Hawaiian bay, two different angles ??, Both sunrises were one to remember, especially the rainbow one ? and they also had absolutely amazing hiking views all around. , ? Kahana Bay, Oahu, ...


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 95L

A broad area of low pressure centered a few hundred miles east-southeast of Bermuda continues to show signs of organization. Additional development of the low is possible, and this system could become a short-lived tropical depression or storm during the next couple of days while it moves northward and north-northeastward, well northeast of Bermuda.

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

 

>>> Eastern Tropical Atlantic:

A tropical wave and associated area of low pressure has moved offshore of west Africa with disorganized showers and thunderstorms. Environmental conditions are forecast to be marginally conducive for development, and a tropical depression could form by the middle to latter portions of the week while the system moves generally westward at 15 to 20 mph across the eastern and central tropical Atlantic.

* Formation chance through 48 hours…low…20 percent
* Formation chance through 7 days…medium…60 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: 

Tropical Cyclone 09E (Iselle)…is located about 555 miles west-southwest of the southern tip of Baja California

ISELLE CONTINUES TO STRENGTHEN

According to the NHC advisory number 5…

Iselle is moving toward the northwest near 13 mph and this motion is expected to continue through tonight, followed by a turn toward the west-northwest on Tuesday. Maximum sustained winds have increased to near 65 mph with higher gusts. Some strengthening is expected over the next 12 to 24 hours, and Iselle could become a hurricane by tonight. Gradual weakening is then forecast starting later on Tuesday. Tropical-storm-force winds extend outward up to 140 miles from the center. The estimated minimum central pressure is 992 mb (29.30 inches).

cone graphic

 

>>> Well Southwest of the Baja California Peninsula:

Invest 91E

Satellite wind data indicate that the small area of low pressure located well to the southwest of the southern tip of the Baja California Peninsula has become a little better defined. However, the shower and thunderstorm activity remains disorganized. Environmental conditions could still support the development of a short-lived tropical depression during the next day or so while the system moves generally northward, before it becomes absorbed by Tropical Storm Iselle.

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

 

>>> Central East Pacific:

An area of low pressure is expected to develop well south of the southern tip of the Baja California Peninsula in a day or two. Environmental conditions are forecast to be favorable for development thereafter, and a tropical depression is expected to form by the end of this week while the system moves generally west-northwestward at 10 to 15 mph.

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

 

>>> Well Offshore of Southern Mexico:

Another area of low pressure could form well offshore of Central America late this week. Environmental conditions appear conducive for some gradual development of this system over the weekend while it moves westward to west-northwestward at 10 to 15 mph well offshore of southern Mexico.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…30 percent 

 

>>> Western East Pacific:

A broad area of low pressure is forecast to form well to the east-southeast of the Hawaiian Islands during the middle part of the week. Some slow development of this system is possible later this week while it moves northeastward or northward across the western portion of the East Pacific.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…20 percent

 

Central North Pacific:

Tropical Cyclone 01C (Lala)…is located about 390 miles north-northeast of Kure Atoll

LALA HOLDING STEADY MOVING NORTHWESTWARD

According to the NHC advisory number 49…

Lala is moving toward the northwest near 5 mph. A slow northwestward motion is forecast during the next few days. Maximum sustained winds are near 65 mph with higher gusts. Gradual weakening is forecast during the next several days. Tropical-storm-force winds extend outward up to 175 miles from the center. The estimated minimum central pressure is 988 mb (29.18 inches).

 

Tropical Cyclone 02C (Moke)…is located about 445 miles southwest of Hilo, Hawaii

FLASH FLOOD THREAT CONTINUES FOR PORTIONS OF THE BIG ISLAND OF HAWAII

According to the NHC advisory number 15…

The depression is moving toward the west near 14 mph. and this motion is expected to continue for the next day or two, taking the system farther away from the Hawaiian Islands. Maximum sustained winds are near 35 mph with higher gusts. Weakening is expected, and Moke is forecast to degenerate to a remnant low pressure area late today and dissipate on Tuesday. The estimated minimum central pressure is 1004 mb (29.65 inches).

cone graphic

 

 Northwest Pacific Ocean:

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

 

Tropical Cyclone 17W (Saudel)…is located approximately 323 NM east-southeast of Kadena AB

https://www.metoc.navy.mil/jtwc/products/wp1726.gif

 

Tropical Cyclone 18W (Narra)…is located approximately 115 NM southeast of Hanoi, Vietnam

https://www.metoc.navy.mil/jtwc/products/wp1826.gif

 

Tropical Cyclone 19W (Atsani)…is located approximately 514 NM south-southwest of Iwo-to

https://www.metoc.navy.mil/jtwc/products/wp1926.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:
Mountain Hayfields Can Filter Nutrients and Support Clean Water

Irrigated mountain hayfields can act as large filtration systems that reduce sediment, phosphorus and other contaminants from runoff, sometimes improving the quality of water flowing back into the environment, Colorado State University research has found.

The findings result from a producer-driven, three-year study by CSU’s Agricultural Water Quality Program in the Yampa, Gunnison and Colorado River basins.

The examination of agricultural impacts on water quality found consistently low nutrient concentrations in runoff from Colorado hayfields – lower than levels warranting concern and sometimes lower than when the water was applied to fields.

“These irrigated ag lands in the mountains are essentially large grass filter strips,” said Erik Wardle, director of the Agricultural Water Quality Program, who conducted the research. “Their impacts are very low, and in some cases, they even have the potential to clean the water, depending on management and localized conditions.”

Read More: Colorado State University

Image: Hay bales in a field near Crawford, Colorado. Colorado State University research has found that irrigated mountain hayfields have low impact on surface water and sometimes filter nutrients and sediment from water.