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

 

The latest update to this website was at 127pm Monday afternoon HST


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

2.61  Mount Waialeale, Kauai
2.06  Punaluu Pump, Oahu
0.76  Puu Alii, Molokai
0.10  Lanai City, Lanai
3.48  Puu Kukui, Maui
0.87  Glenwood, Big Island


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

23  Lawai, Kauai – ENE
37  Oahu Forest NWR, Oahu – E
35  Makapulapai, Molokai – E
m   Lanai – missing
46  Na Kula, Maui – ESE
35  South Point, Big Island – NE


Hawaii’s Mountains – Here’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.


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

   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/GEOCOLOR/20262361430-20262362220-GOES18-ABI-HI-GEOCOLOR-600x600.gif

 TC Moke southwest 

 

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 heavy around the Big Island 

 

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

Please open this link to see details on any current Watches, Warnings and Advisories noted above




~~~ Hawaii Weather Narrative ~~~

 

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 afternoon:  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 afternoon: 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 Map / Looping Surface Precipitation…through the next 8-days / Vog Map

 

Marine Conditions…as of Monday afternoon: 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

An area of low pressure located a couple of hundred miles east of Bermuda is moving northward at 15 to 20 mph. Although the shower activity is showing signs of organization, the circulation remains broad and elongated. This system could become a short-lived tropical depression or storm on Tuesday before it moves over cool waters and into unfavorable environmental conditions Tuesday night and Wednesday.

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

 

>>> Eastern Tropical Atlantic:

Invest 96L

A tropical wave and associated area of low pressure over the far eastern Atlantic a few hundred miles southeast of the Cabo Verde islands is producing disorganized showers and thunderstorms. This system could become a tropical depression during the next few days while it moves westward to west-northwestward at 15 to 20 mph across the eastern and central tropical Atlantic. Environmental conditions could become less conducive for development by the weekend.

* Formation chance through 48 hours…medium…40 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 580 miles west-southwest of the southern tip of Baja California

ISELLE NEAR HURRICANE STRENGTH

According to the NHC advisory number 6…

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 70 mph with higher gusts. Additional strengthening is likely through this evening, and Iselle could becoming a hurricane during that time. Gradual weakening is then forecast starting later on Tuesday. Tropical-storm-force winds extend outward up to 195 miles from the center. The estimated minimum central pressure is 988 mb (29.18 inches).

cone graphic

 

Tropical Cyclone 10E…is located about 965 miles southwest of the southern tip of Baja California

TROPICAL DEPRESSION TEN-E FORMS OVER OPEN WATERS…FORECAST TO DISSIPATE OR BE ABSORBED BY ISELLE TUESDAY NIGHT

According to the NHC advisory number 1…

The depression is moving toward the north near 8 mph. This motion with an increase in forward speed is expected tonight and Tuesday. Maximum sustained winds are near 35 mph with higher gusts. Slight strengthening is forecast, and the depression is likely to become a tropical storm tonight. The circulation is forecast to dissipate as it becomes absorbed by Iselle on Tuesday night. The estimated minimum central pressure is 1006 mb (29.71 inches).

 

>>> Central East Pacific:

A tropical wave located well to the south of southern Mexico is producing disorganized showers and thunderstorms. Environmental conditions are forecast to be favorable for development, and a tropical depression is expected to form by the end of the week while the system moves generally west-northwestward at 10 to 15 mph, well offshore of Mexico.
* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…high…90 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. The system could become a tropical depression by the end of the weekend into early portion of next week.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…medium…40 percent 

 

>>> Western East Pacific:

A trough of low pressure located well to the east-southeast of the Hawaiian Islands is producing some disorganized showers and thunderstorms. Some slow development of this system is possible over the next several days while it drifts north-northeastward.

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

 

Central North Pacific:

Tropical Cyclone 01C (Lala)…is located about 405 miles north-northeast of Kure Atoll

LALA MAINTAINING ITS INTENSITY FOR NOW

According to the NHC advisory number 50…

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 expected during the next several days. Tropical-storm-force winds extend outward up to 150 miles from the center. The estimated minimum central pressure is 988 mb (29.18 inches).

 

Tropical Cyclone 02C (Moke)…is located about 515 miles east of Johnston Island

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

According to the NHC advisory number 18…

The depression is moving toward the west near 16 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 1005 mb (29.68 inches).

cone graphic

 

 Northwest Pacific Ocean:

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

 

Tropical Cyclone 17W (Saudel)…is located approximately 248 NM east-southeast of Kadena AB

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

 

Tropical Cyclone 18W (Narra)…is located approximately 136 NM southeast of Hanoi, Vietnam

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

 

Tropical Cyclone 19W (Atsani)…is located approximately 424 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.