The latest update to this website was at 635pm Wednesday (HST)

 

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

0.89  Mount Waialeale, Kauai
1.04  Palisades, Oahu
0.35  Puu Alii, Molokai
0.00  Lanai
0.39  Waikamoi Treeline, Maui
0.36  Pahoa, Big Island

The following numbers represent the strongest wind gusts (mph) as of Wednesday evening:

30  Port Allen, Kauai
37  Oahu Forest NWR, Oahu
32  Makapulapai, Molokai
32  Lanai City, Lanai
45  Ukumehame Gulch, Maui
48  Kawaihae Rd, 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/GOES18-TPW-13-900x540.gif

Thunderstorms in the deeper tropics…cold front far northwest 

 

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

 Mostly low clouds…along with high cirrus clouds approaching from the west 

 

 

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

Showers locally 

 

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

 

~~~ Hawaii Weather Narrative ~~~

 

Glenn’s Wednesday comments:  I’m here at my friend’s house in Corte Madera, Marin County, California

It’s cloudy here in Marin County early this morning. The low temperature was 54 degrees.

It’s partly cloudy here in Corte Madera this afternoon. I had a great time playing Pickleball in Mill Valley, here in Marin County, which is just north of San Francisco. The temperature has been running between 69-71 all afternoon.

The clouds have cleared and the temperature has dropped quickly to 54 degrees early this evening.

A bit later here in Corte Madera it’s a chilly 49.5 degrees under clear skies.

Weather Wit of the day: Bird Migrations – Poultry in motion

>>> Highest Temperature Wednesday, October 22, 2025 – 97 near La Puerto, Texas
>>> Lowest Temperature Wednesday, October 22, 2025 – 15 near Grand Lake, Colorado

 

Hawaii’s Broad Brush Weather Overview: Breezy trade winds will become locally windy Friday into the weekend as high pressure north of the state strengthens and moves eastward. Showers will favor windward and mountain areas, and occasionally spill over to interior and leeward areas.

Pockets of drier air filtering into the area, coinciding with the stronger winds, will introduce fire weather concerns Friday and Saturday. By early next week, trades will weaken slightly and rain chances will potentially increase, but forecast confidence remains low due to differing model solutions.

Hawaii’s Weather Details: Broad surface high pressure is located far northwest of the Hawaiian Islands, and is driving locally breezy trade winds across the state. In the upper levels, elongated troughing extends from near a strong upper low over Southern California to near the Hawaiian Islands.

Local radar and GOES-West satellite imagery show a few clouds and showers embedded within the breezy trades moving into windward areas of the islands, though observed rainfall totals from across the state show that most areas have been relatively dry (save for windward sites on primarily Kauai). Typical afternoon sea-breeze convergence along the Kona slopes of the Big Island have also increased scattered showers there as well.

Tonight through early Thursday, most model guidance all depict some variation of increasing moisture and enhanced windward showers. This is especially notable in the models for the north and east sections of the Big Island, where a cluster of clouds and showers is forecast to move closer to the upper troughing as it approaches.

This area appears rather unimpressive on current satellite imagery, however, casting at least some skepticism on if this will actually materialize during the early morning hours. Regardless, early morning windward shower chances are at least possible.

Additionally, there is potential for isolated thunderstorms for the Big Island on Thursday afternoon, when models show the coolest temperatures aloft as the upper trough lingers near the east end of the state.

The surface high pressure to the northwest of the state that is driving the locally breezy trades, will gradually strengthen and slide eastward through the weekend. As it does so, the local pressure gradient will strengthen and thereby result in an upward trend in trade winds for the next couple of days. The trades are forecast to be strongest Friday into Saturday, with some windier areas potentially flirting with Wind Advisory criteria (sustained wind speeds 30 mph) during that time.

Meanwhile, guidance also continues to show a brief period of drier air filtering in across the area during the day on Thursday, followed by a plume of moisture overnight, and another pocket of drier air Friday through the weekend. While relative humidity values may be borderline, confidence is increasing that there is potential for critical fire weather thresholds to be met on both Friday and Saturday, as the increased trade wind speeds corresponds with the arrival of drier air.

Therefore, a Fire Weather Watch is now in affect for central and leeward zones of the islands, in addition to the Big Island North zone where extreme drought is occurring, from Friday morning through Saturday afternoon, though the main concern will be from late morning through the afternoon hours each day, when relative humidities will be at their lowest. See the Fire Weather section below for more details.

Model guidance is in decent agreement in that an upper level low will break free from its parent trough over the weekend, and retrograde westward near to or over the island chain. However, global models differ on both the placement and timing of the upper low from late weekend into early next week, decreasing forecast confidence.

For now, look for a moderate to locally breezy trade wind pattern Sunday into early next week, as the high pushes further to the east and weakens, with a slightly wetter trade wind pattern Monday into Tuesday to reflect overall model trends.

Fire weather:  By Thursday morning, locally windy trades and decreasing moisture will begin increasing fire weather concerns. However, model guidance shows that another pocket of drier air will arrive Friday into Saturday, coinciding with the strongest trade wind speeds. Critical fire weather conditions will be possible during this time, with relative humidity values dropping into the low 40 percent range and trade winds reaching above sustained speeds of 20 mph.

Since confidence is increasing, a Fire Weather Watch has been issued for leeward portions of all Hawaiian Islands, as well as interior sections of Oahu and the Big Island, from Friday morning through Saturday afternoon (though the greatest concern will be from late morning through the afternoon hours each day when relative humidity will be lowest). All of North Big Island has also been included in the Fire Weather Watch due to extreme drought conditions.

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 high pressure ridge north of the Hawaiian Islands will continue to produce moderate to strong trade winds lasting into the weekend. The Small Craft Advisory (SCA) was extended in time through Friday morning for the typical windy waters around the Big Island and Maui County. This SCA will likely continue through the weekend. An expansion in SCA coverage may develop later this week as strong winds expand in area.

Two north-northwest (330-340 deg) swells, one medium period and one long period, are moving through the Hawaii area. The long period swell will build surf heights, peaking later tonight through Thursday near High Surf Advisory (HSA) thresholds for north and west facing shores, before slowly decreasing on Friday. Another long period north-northwest (330-340 deg) swell builds into the region on Friday, this next swell will also approach HSA thresholds along north and west facing shores from Friday night into Saturday.

Rough and choppy surf will continue along east facing shores due to strong trade winds from late Thursday into the weekend. Small background south swell energy will continue to keep surf along south facing shores above flat levels into early next week.

 



World-wide Tropical Cyclone Activity

 

Atlantic Ocean:  There are no active tropical cyclone

Tropical cyclone formation is not expected during the next 7-days.

 

Caribbean Sea: 

Tropical Cyclone Melissa…is located about 335 miles south-southwest of Port Au Prince, Haiti

MELISSA EXPECTED TO BRING HEAVY RAINS AND LIFE-THREATENING FLOODING TO PORTIONS OF HISPANIOLA AND JAMAICA INTO THE WEEKEND

According to the NHC advisory number 7

Melissa is moving toward the west near 2 mph. A slow forward speed and a gradual turn to the northwest or north-northwest is forecast during the next couple of days, followed by a westward turn by this weekend. On the forecast track, Melissa is expected to be nearer to Jamaica and the southwestern portion of Haiti later this week. Maximum sustained winds are near 50 mph with higher gusts. Some slow strengthening is forecast during the next few days, and Melissa could become a hurricane by Friday, with more substantial intensification forecast by this weekend. Tropical-storm-force winds extend outward up to 115 miles from the center. The estimated minimum central pressure is 1003 mb (29.62 inches).

 

Gulf of America:  There are no active tropical cyclone

Tropical cyclone formation is not expected during the next 7-days.

 

Northeastern Pacific:  There are no active tropical cyclone

Central East Pacific:

>>> A tropical wave located several hundred miles southwest of the coast of southwestern Mexico is producing disorganized showers and thunderstorms. Environmental conditions appear conducive for gradual development of this system, and a tropical depression is likely to form by the end of the weekend while it moves generally westward at 10 to 15 mph.

* Formation chance through 48 hours…low…30 percent 
* Formation chance through 7 days…high…70 percent 

 

North Central Pacific: There are no active tropical cyclone

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

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

 

Northwest Pacific Ocean: 

Tropical Cyclone 30W (Fengshen) is located approximately 17 NM east of Da Nang, Vietnam – Final Warning

https://www.metoc.navy.mil/jtwc/products/wp3025.gif

Southwest Pacific Ocean:  There are no active tropical cyclones

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

South Indian Ocean:

Tropical Cyclone 04S (Chenge) is located approximately 611 NM north-northeast of Port Louis, Mauritius

https://www.metoc.navy.mil/jtwc/products/sh0426.gif

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:  Important Phenomenon Discovered in the Arctic – Could Boost Marine Life

Researchers from the University of Copenhagen have discovered an important phenomenon beneath the Arctic sea ice that was previously thought impossible. This phenomenon could have implications for the food chain and the carbon budget in the cold north.

The shrinking sea ice in the Arctic Ocean is, overall, a disaster. But paradoxically, the melting of the ice can also fuel the engine of the Arctic food chains: algae.

Algae are the main food source for life in the sea, but they need nitrogen to grow. And nitrogen is in short supply in the Arctic Ocean. However, a new international study led by the University of Copenhagen indicates there will probably be more of it in the future than previously thought. This could change the future prospects for marine life in the High North and possibly for the carbon budget.

The researchers are the first to discover that the phenomenon of nitrogen fixation occurs beneath sea ice even in the central Arctic Ocean. Nitrogen fixation is a process in which special bacteria convert nitrogen gas (N2) dissolved in seawater into ammonium. Ammonium helps the bacteria to grow, but it also benefits algae and the rest of the food chain in the sea.

Read More: University of Copenhagen

Image: Measurements were taken at 13 different locations in the Arctic Ocean