Glenn James
Hawaii Weather Today
Founder and maintainer for 30 years


The latest update to this website was  615pm Sunday evening HST


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

0.12  Waiakoali, Kauai 
0.31  Kamananui Stream, Oahu
0.39  Honolimaloo, Molokai
0.31  Lanai 1, Lanai
0.58  Haiku, Maui
0.50  Kaiholena, Big Island


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

21  Barking Sands, Kauai – SE
12  Palehua, Oahu – WNW
12   Anapuka, Molokai – NNW
08  Lanai 1,  Lanai – NW 
14  Veterans Hwy, Maui – NW 
21  South Point, Big Island – E


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. 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

A deep area of low pressure far north…with thunderstorms southwest

 


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Multi-level clouds moving over the state 

 

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

 

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

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




~~~ Hawaii Weather Narrative ~~~

 

Glenn’s Sunday comments:  I’m here in Vancouver, BC, Canada with my friend Bob, continuing on in my working vacation.

805am Hawaii time, it’s cloudy here in Vancouver, with the temperature 56.3 degrees, after a low 46 degrees. We walked over to our favorite breakfast restaurant, called Cafe Zen, which we’re both taken with, after all…three mornings in a row. We’re heading over to Stanley Park, to walk the sea wall, while looking for Orca’s (killer whales), and Heron’s nesting up in the trees.

244pm, it’s cloudy and cool although with no rain. We took a long walk along the sea wall, and then headed inland a bit, to walk around a lake called Lost Lagoon. We saw several large Herons, and enjoyed looking across the water at all the skyscrapers near downtown. We ended up at Whole Foods and I had my usual large salad, and ate it while sitting outside. We then went to a coffee place and I got a double Americano, which we took down to English Bay Beach and sat looking out the water and did a bit of people watching.

 

>>> Interesting weather web blog – Mauka Showers…How Fast is a Flash Flood in Hawaii?

>>> Highest Temperature Sunday, April 12, 2026 – 95 degrees at Rio Grande Village, TX
>>> Lowest Temperature Sunday, April 12, 2026 –  10 degrees at Mount Washington, NH

 

Hawaii’s Broad Brush Weather Overview…as of 3pm Sunday afternoon:  Light to moderate rain will continue through tonight over the western portion of the state. A few showers may be locally heavy. Quieter weather then settles in for the remainder of the week, and light trades return by week`s end.

>>> Rain bands have formed and are moving over Kauai and Oahu, and are heading toward Molokai. Saturated ground could cause rapid flooding.
>>> Big island will see afternoon showers, some heavy, due to sea breeze, but will not be impacted by rain bands.
>>> The best chance for flooding is still expected to be over western islands – possibly extending east to Molokai and Maui.

Weather Details for the Hawaiian Islands…as of 3pm Sunday afternoon: No instability, weak forcing, and rather high stability have allowed Oahu to dodge a potentially impactful flooding event. Little change is expected during the next several hours, so rain rates are expected to remain in check. Will draw back the ending time for Kauai through Maui to 6am tomorrow morning.

Light showers and mid-level clouds are likely to linger over the western end of the state for the balance of the week, before another trough pivots through, and brings a slight increase in rainfall on Friday or Friday night. This trough is modeled to be progressive and likely not impactful. Despite the grungy pattern that may hang over Kauai and Oahu through the week, for the first time in awhile, there is no potential event on the horizon.

The large scale pattern is gradually migrating away from low pressure anchoring north of the islands, though high pressure struggles to build as the mid-latitudes transition toward a more progressive pattern. Light winds favoring onshore sea breezes each afternoon, may trigger rather productive convection in terms of showers as the moisture-rich airmass lingers. Trades do return by late in the week, but remain quite light and may not make much of a dent in local humidity.

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/


Marine Environmental Conditions: A weak surface trough will linger in the vicinity of the central and northwestern islands into early next week, keeping moderate to fresh southeasterly winds to its east, and light to moderate southerly winds to its west. This weak surface boundary along with an upper level disturbance moving over the region is currently bringing another round of showers and the potential for isolated thunderstorms this afternoon into Monday. As the surface trough lifts northwest and high pressure to the northeast begins to take over at the surface, gentle to moderate easterly trades will gradually develop across the Hawaiian coastal waters by the end of the week.

A moderate, medium-period north-northwest swell (340 degrees) generated by the formerly-gale force low north-northwest of the main Hawaiian islands is filling in along north and west facing shores this afternoon. This swell will maintain small to moderate surf through Monday, followed by a decline in northwest swell energy for the rest of the week.

A medium-period south swell will continue to decline through Monday. By Tuesday, however, a new south swell will arrive, once again providing a boost to surf along south facing shores through mid week before gradually subsiding into the weekend.

Surf along east facing shores will remain below seasonal average with lighter than average trade winds near and upstream of the islands forecast through next week.

 

Hurricane Hone brings heavy rain, damaging winds and power outages to Hawaii's Big Island | B99-9 WZBB-FM

 Rainy weather with gusty winds locally


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

>>> Caribbean Sea: There are no active tropical cyclones

>>> Gulf of Mexico: There are no active tropical cyclones

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

 

>>> Eastern Pacific: There are no active tropical cyclones

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

>>> Central Pacific: There are no active tropical cyclones

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

 

>>> Northwest Pacific Ocean:

Tropical Cyclone 04W (Sinlaku)…is located approximately 262 NM east-southeast of Navsta, Guam

https://www.metoc.navy.mil/jtwc/products/04W_130000sair.jpg

 

>>>Southwest Pacific Ocean: There are no active tropical cyclones

>>> North and South Indian Oceans / Arabian Sea: There are no active tropical cyclones



Interesting:  A New Way to Eavesdrop on Ocean Temperature in the Arctic

New research led by scientists at UC San Diego’s Scripps Institution of Oceanography finds that the travel time of underwater sounds traveling across the Arctic Ocean can be used to precisely measure ocean temperature under the region’s sea ice, providing precious data on temperature variability in a rapidly changing environment that is remote and difficult to access. The technique, known as ocean acoustic thermometry, was originally developed by the late Walter Munk and Peter Worcester at Scripps and Carl Wunsch at the Massachusetts Institute of Technology.

The basic principle leveraged by acoustic thermometry is that sound travels faster in warmer water and slower in colder water. The technique uses this relationship to infer the temperature of the water the acoustic signal passes through by measuring the time it takes the sound to travel from one point to another. The researchers tested the method during the 2019-2020 Arctic field season with the joint US-Norwegian Coordinated Arctic Acoustic Thermometry Experiment (CAATEX). The team used six bottom-anchored moorings across a roughly 2,600-kilometer (1,600-mile) path in the Arctic Ocean to transmit and measure acoustic signals every three days. The moorings spanned the Arctic Ocean, from north of Alaska in the west to north of Svalbard in the east, and remained in place for one year.

The experiment aimed to test whether this might be a viable way to measure Arctic Ocean temperature year-round, or if challenges such as the scattering of the sound by the rough undersides of sea ice might render the signals undetectable or impossible to decipher.

Read More at: University of California San Diego

An acoustic sound source manufactured at the Marine Science Development Center for Scripps researcher Matthew Dzieciuch being deployed in the Arctic Ocean from the U.S. Coast Guard Icebreaker Healy. Acoustic systems like these are uniquely able to monitor under the ice where satellites are compromised, and provide an unprecedented look at the changing Arctic environment.