The latest update to this website was at 420pm Tuesday (HST)

 

Here are the highest temperatures Tuesday…and the lowest Tuesday morning:

87 – 76  Lihue AP, Kauai
88 – 74  Molokai AP, Molokai
90 – 75  Kahului AP, Maui – Record high Tuesday – 95 in 2018
88 – 77  Kona AP, Big Island
85 – 71  Hilo, AP, Big Island

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

2.07  N Wailua Ditch, Kauai
0.35  Poamoho RG 1, Oahu
0.04  Puu Alii, Molokai
0.00  Lanai
0.13  West Wailuaiki, Maui
0.58  Kawainui Stream, Big Island

>>> There are lots of locations that measure rainfall and winds, here’s a map of all areas for your reference (the map is clickable to zoom in closer)

The following numbers represent the strongest wind gusts (mph) as of Tuesday afternoon:
29 Port Allen, Kauai
35  Kuaokala, Oahu
36  Makapulapai, Molokai
29  Molokai AP, Lanai
40  Na Kula, Maui
32  Kealakomo, Big Island

Hawaii’s Mountains – Here’s a link to the live webcams on the summit of our tallest mountain Mauna Kea (~13,800 feet high) on the Big Island of Hawaii, and atop the Haleakala Crater (~10,023 feet) 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/13/1800x1080.jpg

Thunderstorms south and northwest 

 

https://www.weather.gov/images/hfo/satellite/Hawaii_IR_loop.gif

Low clouds in our vicinity…along with a few high level clouds 

 

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

Showers locally 

 

 

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 home here in upper Kula, Maui, Hawaii.

It’s clear partly cloudy here in Maui County early this morning, with a few exceptions.  The low temperature at my place was 56 degrees.

1105am, sunny to partly sunny here in Maui County.

417pm, very sunny and rather hot afternoon here in upcountry Kula.

Weather Wit of the day:  Pollution Control Company – A firm that makes money by sticking its business into other peoples noses

>>> Highest Temperature Tuesday, August 19, 2025 – 116 near Topcok, AZ
>>> Lowest Temperature Tuesday, August 19, 2025 – 24 at Peter Sinks, Utah

 

Hawaii’s Broad Brush Weather Overview:  Moderate to locally breezy trade winds will continue through the rest of this week as high pressure builds over the state. A subtle increase in windward and mountain showers is possible on Wednesday, but in general, expect mostly dry and stable conditions into the weekend.

Hawaii’s Weather Details: Latest radar and satellite imagery shows mostly dry conditions prevailing across the islands, with relatively few clouds and almost no showers as high pressure builds over the region. Moderate to locally breezy trade winds are observed at most locations, with the highest gusts generally in the 20 to 30 mph range. Afternoon soundings from Hilo and Lihue show the trade wind inversion between 5,000 and 6,000 feet.

Models indicate that ridging will remain in place for the next several days, which will continue the breezy trades through the end of the week. As previous discussions have mentioned, guidance continues to show that a subtle plume of moisture will move across the islands during the day on Wednesday, which may bring a slight increase in clouds and showers over windward and mountain areas (though this would be subtle).

Other than this, however, an overall dry trend will continue through the week, with the typical summertime trade wind weather and dry, stable conditions. With the dry and breezy conditions throughout the rest of this week and into the weekend, we could see elevated fire weather concerns, especially across leeward areas.

Next week, a plume of moisture embedded within the trades could move into the islands by Monday or Tuesday, increasing windward and mountain clouds and showers once again.

Fire weather: Moderate to locally breezy trade winds are expected as high pressure builds over the state. Satellite imagery and latest guidance shows direr air filtering into the region as inversion heights lower to around 5,000 to 6,000 feet. Despite lowest relative humidities dipping as low as the mid 40’s during the afternoon hours each day, wind speeds look to be a limiting factor, so not anticipating any fire weather headlines at this time.

Here’s a near real-time Wind Profile of the Pacific Ocean – along with a Closer View of the islands / Vog map animation / 8-Day Precipitation model

https://www.weather.gov/images/hfo/graphics/npac.gif 

 

Hawaii’s Marine Environment:  A ridge of high pressure far north of the state will maintain fresh to locally strong trade winds throughout the forecast period. A Small Craft Advisory (SCA) is in effect for the windier waters and channels around Maui County and the Big Island, and will likely persist throughout the week.

A series of small, medium period south (170-190 degree) swells are expected throughout the week, with surf holding near the summer average. Surf heights should decrease Sunday into early next week as these swells fade. Choppy conditions will continue for east-facing shores through the forecast period due to the persistent fresh trades. Surf along north facing shores will remain flat to tiny through the forecast period.

Peak high tides associated with the lunar cycle will lead to minor coastal flooding along shorelines and low lying coastal areas this afternoon, and likely peaking Wednesday and Thursday afternoons. A Coastal Flood Statement has been issued for minor coastal flooding this week.

 



World-wide Tropical Cyclone Activity

 

Atlantic Ocean:  

Tropical Cyclone Erin…is 570 miles south-southeast of Cape Hatteras, North Carolina

HURRICANE HUNTER AIRCRAFT INVESTIGATING ERIN…LIFE-THREATENING RIP CURRENTS EXPECTED ALONG U.S. EAST COAST BEACHES

According to the NHC advisory number 34A

Erin is moving toward the north-northwest near 10 mph. This motion with an increase in forward speed is expected through tonight followed by a northward motion on Wednesday and then a northeastward motion on Thursday. On the forecast track, the center of Erin will pass to the east of the Bahamas tonight, and then move over the western Atlantic between the U.S. east coast and Bermuda on Wednesday and Thursday. Maximum sustained winds are near 105 mph with higher gusts. Some fluctuations in intensity are possible during the next couple of days. Erin is a large hurricane. Hurricane-force winds extend outward up to 80 miles from the center and tropical-storm-force winds extend outward up to 230 miles.

cone graphic

 

Near the Leeward Islands in the Tropical Atlantic

>>> A tropical wave located over the central tropical Atlantic continues to produce a broad area of disorganized showers and thunderstorms. Environmental conditions appear conducive for gradual development of this system, and a tropical depression could form late this week or over the weekend while it moves near or the north of the northern Leeward Islands.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…medium…60 percent

 

Eastern Tropical Atlantic

Invest 99L

>>> A tropical wave located just southwest of the Cabo Verde Islands continues to produce shower and thunderstorm activity while it moves westward at about 15 mph. A short-lived tropical depression could form during the next day or two before environmental conditions before unfavorable for further development late this week.

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

 

Northeastern Pacific

Tropical cyclone formation is not expected over the next 7 days.

Here’s the link to the National Hurricane Center (NHC)

 

North Central Pacific: 

Tropical cyclone formation is not expected over the next 7 days.

Here’s the link to the Central Pacific Hurricane Center (CPHC)

 

Northwest Pacific Ocean: 

Tropical Cyclone 18W…is located approximately 137 NM north-northwest of Kadena AB

https://www.metoc.navy.mil/jtwc/products/wp1825.gif

Southwest Pacific Ocean:  There are no active tropical cyclones

North and South Indian Ocean:  There are no active tropical cyclones

South Indian Ocean: There are no active tropical cyclones

Arabian Sea:  There are no active tropical cyclones

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

 

>>> Here’s a link to the Pacific Disaster Center’s (PDC Global) Weather Wall website

 

Interesting:  NASA-Developed Printable Metal Can Take the Heat

Until now, additive manufacturing, commonly known as 3D printing, of engine components was limited by the lack of affordable metal alloys that could withstand the extreme temperatures of spaceflight. Expensive metal alloys were the only option for 3D printing engine parts until NASA’s Glenn Research Center in Cleveland, Ohio, developed the GRX-810 alloy.

The primary metals in the GRX-810 alloy include nickel, cobalt, and chromium. A ceramic oxide coating on the powdered metal particles increases its heat resistance and improves performance. Known as oxide dispersion strengthened (ODS) alloys, these powders were challenging to manufacture at a reasonable cost when the project started.

However, the advanced dispersion coating technique developed at Glenn employs resonant acoustic mixing. Rapid vibration is applied to a container filled with the metal powder and nano-oxide particles. The vibration evenly coats each metal particle with the oxide, making them inseparable. Even if a manufactured part is ground down to powder and reused, the next component will have the qualities of ODS.

The benefits over common alloys are significant – GRX-10 could last up to a year at 2,000°F under stress loads that would crack any other affordable alloy within hours. Additionally, 3D printing parts using GRX-810 enables more complex shapes compared to metal parts manufactured with traditional methods.

Read More: National Aeronautics and Space Administration (NASA)

Image: GRX-810 is a new metal alloy developed by NASA for 3D printing parts that can withstand the extreme temperatures of rocket engines, allowing affordable printing of high-heat parts.