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

 

The latest update to this website was at 832pm Monday evening HST


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

1.74  Mount Waialeale, Kauai
2.07  Punaluu Pump, Oahu
0.60  Puu Alii, Molokai
0.42  Lanai 1, Lanai
2.05  Puu Kukui, Maui
1.17  Glenwood, Big Island


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

27  Port Allen, Kauai – ENE
28  Oahu Forest NWR, Oahu – SE
28  Makapulapai, Molokai – E
m   Lanai – missing
36  Na Kula, Maui – ENE
23  Kealakomo, 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 (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…moving away / Tropical Cyclone o9E (Iselle) offshore from Baja CA, although is heading west-northwest (which won’t be a threat to Hawaii)

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20262362130-20262370520-GOES18-ABI-HI-14-600x600.gif

 TC Moke southwest 

 

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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 

 

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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%

130pm, it’s cloudy and we just had a quick shower here in upper Kula.

146pm, that quick shower has continued, and gotten a bit heavier…although looking down to Kihei I see sunny conditions of course.

405pm, I had the most fun playing pickleball this morning in Makawao! This group who plays regularly hadn’t seen each other for a couple of weeks, so it was really nice to visit and play our favorite game together!

 

Hawaii’s Weather Highlights…as of Monday evening:  Breezy trade winds will continue to persist through the first half of the week then ease slightly during the second half of the week. Some passing showers will ride in with the breezy trade winds, mainly during the overnight and morning hours. Look for humid conditions tonight, but dewpoints should gradually ease late tonight through Tuesday, with more comfortable humidities returning by Wednesday.

Short Term Update:  Look for the persistence of extensive high pressure at the surface, and breezy trades well into next week. Around this high, a much drier and more stable mid-level airmass will move into our area Wednesday, ensuring increasingly high stability during this time.

Dewpoints will likewise dip toward the upper 60’s to 70 degrees by Wednesday evening, taking the edge off of recent muggy weather. An enhanced but shallow moisture field associated withtroughing from a long-since dissipated tropical system, will be on oue doorstep in about a week, and may bring an increase in showers for windward and mountain areas.

Weather Narrative..as of Monday evening: Latest radar and satellite imagery shows warming cloud tops and decreasing rain rates over the Kona slopes of the Big Island. Thus, the Flood Watch over the Big Island has been cancelled. While the threat for heavy rain has ended over the Big Island, humid conditions will still persist across the state through tonight.

Drier air should gradually move in on Tuesday, which should help bring some relief of the humid conditions. For Tuesday, we are looking at a fairly dry day across the state with breezy trade winds. The one exception will be over the Kona slopes of the Big Island, where they should see afternoon clouds and showers develop. Some brief periods of moderate rain will be possible due to some lingering moisture.

By Wednesday, we should be back to our typical summer time trade wind weather with breezy trades, and a few passing showers over windward and mountain areas. This typical summer time trade wind weather will likely persist through the rest of the week, with brief increases of showers from time to time. Trade winds will also likely ease slightly, and become more moderate to locally breezy speeds by the end of the week.

 

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 evening: Fresh to locally strong trades will persists as Tropical Depression Moke passes far southwest of the island chain and broad high pressure remains north of the state. Convection associated with this system will remain over the far southern portion of the offshore waters as it tracks west. Maui Leeward Waters has been removed from the Small Craft Advisory and now only includes the typical windy waters around Maui County and the Big Island. Surf along east facing shores will remain rough and choppy due to persistent trade wind swell.

Surf along south facing shores will remain below summer average as a small medium period south swell slowly fades through Tuesday. An overlapping small, long period south southwest swell will fill in tonight through Tuesday that should keep surf below the summer average. A slightly larger long period south swell will fill in Wednesday and peak Thursday into Friday. This swell could push surf towards advisory thresholds before slowly fading over the weekend.

Surf along north facing shores will remain tiny.

 

>>> Highest Temperature Monday, August 24, 2026 – 119 degrees at Death Valley, CA


>>>
Lowest Temperature Monday, August 24, 2026 – 29 degrees at Stanley, ID

 

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-northeast of Bermuda is moving northward at 15 to 20 mph. Recent scatterometer wind data suggests that the center of circulation is broad and elongated, and the associated shower activity remains disorganized. This system could still become a short-lived tropical depression or storm later today before encountering increasingly hostile conditions tonight and Wednesday, likely ending its chances for development.

* Formation chance through 48 hours…medium…40 percent
* Formation chance through 7 days…medium…40 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…60 percent
* Formation chance through 7 days…high…70 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 590 miles west-southwest of the southern tip of Baja California

ISELLE REMAINS JUST BELOW HURRICANE STRENGTH

According to the NHC advisory number 7…

Iselle is moving toward the northwest near 15 mph (24 km/h), and this motion is expected to continue through tonight, followed by a turn toward the west-northwest on Tuesday. Maximum sustained winds remain near 70 mph (110 km/h) with higher gusts. A short amount of time remains for additional strengthening, and Iselle could briefly become a hurricane. Gradual weakening is then forecast starting later on Tuesday. Tropical-storm-force winds extend outward up to 195 miles (315 km) from the center. The estimated minimum central pressure is 988 mb (29.18 inches).

cone graphic

 

Tropical Cyclone 10E…is located about 895 miles southwest of the southern tip of Baja California

DEPRESSION COULD BRIEFLY BECOME A TROPICAL STORM BEFORE DISSIPATING ON TUESDAY

According to the NHC advisory number 2…

The depression is moving toward the north-northeast near 9 mph (15 km/h). This motion with an increase in forward speed is expected tonight and Tuesday. Maximum sustained winds remain near 35 mph (55 km/h) with higher gusts. Slight strengthening is forecast, and the depression could become a tropical storm early Tuesday before it becomes absorbed by Iselle later that day. 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 a large area of disorganized showers and thunderstorms. Environmental conditions appear favorable for development of this system, and a tropical depression is expected to form by the end of the week while it moves generally west-northwestward at 10 to 15 mph, well offshore of Mexico.

* Formation chance through 48 hours…low…20 percent
* Formation chance through 7 days…high…90 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…20 percent
* Formation chance through 7 days…medium…50 percent

 

>>> Well Offshore of Southern Mexico:

An area of low pressure could form well offshore of Central America late this week or this weekend. Environmental conditions could support some gradual development of this system, and a tropical depression could form late this weekend or early next week 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…medium…40 percent 

 

Central North Pacific:

Tropical Cyclone 01C (Lala)…is located about 435 miles north-northeast of Kure Atoll

LALA SLOWLY WEAKENING

According to the NHC advisory number 51…

Lala is moving toward the northwest near 6 mph (9 km/h). Slow movement toward the northwest is forecast through the middle of the week. Maximum sustained winds have decreased to near 60 mph (95 km/h) with higher gusts. Additional weakening is expected during the next several days. Tropical-storm-force winds extend outward up to 125 miles (205 km) from the center. The estimated minimum central pressure is 992 mb (29.30 inches).

 

Tropical Cyclone 02C (Moke)…is located about 435 miles east of Johnston Island

MOKE EXPECTED TO BECOME A REMNANT LOW TONIGHT

According to the NHC advisory number 19…

The depression is moving toward the west near 14 mph (22 km/h). This general motion is forecast to continue tonight. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Moke is expected to degenerate into a trough of low pressure tonight or early 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 180 NM east 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 378 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.