The latest update to this website was at 534am Tuesday (HST)

 

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

0.93  Waiahi RG, Kauai
0.72  Lyon, Oahu
0.68  Puu Alii, Molokai
0.00  Lanai
0.21  West Wailuaiki, Maui
1.08  Kaiholena, Big Island

The following numbers represent the strongest wind gusts (mph) as of Tuesday morning:

29  Lihue, Kauai
22  Oahu Forest NWR, Oahu
21  Makapulapai, Molokai
23  Lanai City, Lanai
39  Kealaloloa Rg, Maui
46  Puuloa, 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 southeast of the Big Island

 

 

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

It’s mostly clear here in Marin County early this morning. The low temperature was 43 degrees.

Weather Wit of the day: Autumnal Equinox – When the joys of summer are gone in one fall swoop

Interesting Blog: Mauka Showers – Flash Floods in Hawaii – NWS Long Lead Time Products

>>> Highest Temperature Monday, October 20, 2025 – 103 near Rio Grande Village, Texas
>>> Lowest Temperature Tuesday, October 21, 2025 – 12 near Dubois, WY

 

Hawaii’s Broad Brush Weather Overview: Breezy trades will prevail during the next couple of days, with a slight strengthening of the winds at week’s close. Widely scattered showers moving in on the trade flow will have many areas experiencing brief passing showers with low accumulation.

Higher rainfall totals will remain focused in windward exposures and upslope mountains. A weak trough lingering over the state, along with daytime heating, may provide just enough instability to result in late day isolated thunderstorm activity over Big Island summits.

Hawaii’s Weather Details: Widely scattered showers trapped within breezy trades will result in quick few hundredths of rain for many island communities this morning. The highest Monday rain accumulations of greater than an half of an inch have occurred within Kauai and Oahu’s higher terrain and better exposed east-facing shores.

North Central Pacific troughing, with periodic unseasonably high moisture streaming in on breezy trade flow, will maintain a slightly more wet pattern through the remainder of the week. Troughing lingering over the state between an upper ridge anchored northwest of the islands, and an upper low heading into southern California, will be the impetus to a few more days of widely scattered shower activity.

More frequent showers have been welcome as the majority of the state was suffering through a moderate to severe drought (as of mid October). Periodic high mid layer moisture will continue to pass over Hawaii in this weak troughing scenario, and produce early day lowering clouds and light showers.

As the trough moves south and east of the state, minor cooling aloft with the interior warming through the day, may be enough to destabilize the atmosphere and produce late day into early evening isolated thunderstorms along the slopes of Mauna Kea and Mauna Loa.

The downstream pressure gradient between the surface high expanding north of the region, (in relation to lower equatorial pressure), will be tight enough to maintain breezy trades through Wednesday. A new surface high moving in from the west will fill in the wake of weaker surface pressure, and establish itself north-northeast of the state by the weekend.

This will strengthen trades back to breezy to locally windy (within higher elevations) late Wednesday through Saturday. Sustained upper terrain winds could reach 30 mph with gusts over 40 mph atop ridge tops and through valley channels.

Upper ridging will expand north of the state and steering flow around its eastern periphery will carry drier mid layer air in across the area. This will lead to a relatively drier weekend. A shallow trough will pass across the Central Pacific early next week. While this trough shouldn’t be strong enough to push a cold front near us, it will likely veer winds more southeast and disrupt trade flow. Greater rain and isolated thunderstorm probabilities will exist over Kauai and Oahu early next week, in response to the closer proximity of the northwest trough.

Fire weather:  While winds will remain at recent levels, higher afternoon humidity with occasional showers will help in maintaining low critical fire weather thresholds. Trades are expected to strengthen later this week but with continued elevated humidity. Temperature inversion heights near Maui and the Big Island will range between 7,000 to 8,000 feet for the time being.

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 broad, high pressure ridge to the north will dominate through the week. Trade winds will remain moderate to locally strong and are expected to gradually strengthen during the second half of the week into the weekend. The Small Craft Advisory (SCA) for the typical windy waters around Big Island has been expanded in area to include typical windy waters around Maui County. The SCA has also been extended in time through Wednesday night. The SCA may stick around as winds strengthen further and seas build as an advisory level north-northwest swell fills in around the state.

Back to back small to moderate, long period north northwest to north swells (330-350 degrees) will fill in throughout the rest of week, keeping surf along north and west facing shores elevated. Forerunners of the next reinforcing small, long period north-northwest swell (330 degrees) have been working its way through the offshore buoys. This next swell will build locally and peak late tonight before subsiding Wednesday afternoon.

A moderate, long period swell (330-340 degrees) will build through the day Wednesday, producing near to above advisory level surf for north and west facing shores late Wednesday into Thursday. Another, slightly larger, moderate, long period swell (330-340 degrees) will fill in Friday. This swell will peak well above advisory levels Friday night along north and west facing shores into Saturday, before slowly fading through the rest of the weekend.

Background, medium to long period south to southwest swells will continue to filter into the area through the week, keeping surf along south facing shores from going flat. Rough, choppy surf along east facing shores will continue, and may see a slight increase during the second half of the week into the weekend.

 



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 300 miles south of Port Au Prince, Haiti

THE 13TH TROPICAL STORM OF THE SEASON FORMS OVER THE CENTRAL CARIBBEAN SEA…HURRICANE WATCH ISSUED FOR PORTIONS OF HAITI

According to the NHC advisory number 1

Melissa is moving toward the west near 14 mph. A decrease in forward speed and a gradual turn to the northwest and north is expected during the next few days. On the forecast track, Melissa is expected to approach the southwestern portion of Haiti and Jamaica later this week. Surface observations and satellite data indicate that the maximum sustained winds are near 50 mph with higher gusts. Gradual strengthening is expected during the next few days. 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 a few hundred miles south of the coast of southern 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 late this week as it moves generally westward at 10 to 15 mph, remaining well offshore of Mexico.

* Formation chance through 48 hours…low…20 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 188 NM east-northeast of Da Nang, Vietnam

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 459 NM west-southwest of Diego Garcia

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:  Coral Skeletons Left by a Medieval Tsunami Whisper Warning for Caribbean Region

Sometime between 1381 and 1391, an earthquake exceeding magnitude 8.0 rocked the northeastern Caribbean and sent a tsunami barreling toward the island of Anegada.

Flooding scattered debris across the island, depositing coral boulders hundreds of meters inland. The corals died but their skeletons remain. More than six centuries later, scientists are learning that these skeletons hold clues about tsunami history. Computer models showed the flooding likely resulted from a tsunami generated during a large earthquake in the nearby Puerto Rico Trench.

Now, in an open-access paper recently published in Geophysical Research Letters, researchers narrow the tsunami time frame to the last decades of the 14th century. The researchers expect this finding to support ongoing efforts to prepare for future Caribbean tsunamis.

Read More: University of Washington

Image: An earthquake between 1381 and 1391 triggered a tsunami in the northeastern Caribbean sea that stranded large coral boulders hundreds of meters inland on Anegada, the northernmost of the British Virgin Islands. A new University of Washington-led study dates the event based on analyses of the coral. Co-author Robert Halley is pictured beside a specimen.