Glenn James
Hawaii Weather Today
Founder and maintainer for 30 years


The latest update to this website was 1030am Saturday morning


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

2.28  Makaha Ridge, Kauai 
7.65  Kuaokala, Oahu
3.00  Honolimaloo, Molokai
0.77  Lanai City, Lanai
5.31  Summit, Maui
4.36  Nene Cabin, Big Island


The following numbers represent the strongest wind gusts (mph) Saturday morning:

09  Port Allen, Kauai – NE
07  Oahu Forest NWR, Oahu – SW
28   Makapulapai, Molokai – E
25  Lanai 1,  Lanai – SSE 
28  Maalaea Bay, Maui – SSW 
25  Aipaloa, Big Island – SE


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 deepening area of low pressure north-northwest…with a cold front


https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261011210-20261012000-GOES18-ABI-HI-GEOCOLOR-600x600.gif

Multi-level clouds moving over the state from the southwest

 

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…some heavy

 

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 Saturday comments:  I’m here in Vancouver, BC, Canada on a working vacation.

 

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

>>> Highest Temperature Friday, April 10, 2026 – 96 degrees near Calipatria, CA
>>> Lowest Temperature Saturday, April 11, 2026 –  15 degrees near Lutsen, MN

 

Hawaii’s Broad Brush Weather Overview…as of 911am Saturday:  A band of showers, some heavy, will develop over the western half of the state tonight and bring rainfall into early next week. Winds remain light with moderate trades building in by the end of the week.

>>> Today: areas of light to locally moderate rain.
>>> Heaviest rain to move back into western islands this evening.
>>> Slight chance of thunderstorms over mainly interior Big Island this afternoon.
>>> Focus Sunday through Monday will be over western islands – possibly extending east to Molokai.

Short Term Update…as of 902am Saturday: Dry air filling in behind the departing low. However, developing subsidence and weak dry air will scour this moisture out today. Radar returns have rapidly diminished over the Big Island. Scattered light showers continue lifting SW-NE in the Kaiwi Channel and western Maui County. These showers will remain light in the very near term, but the boundary could serve as a focus for afternoon convection as it wavers between Oahu and Molokai. However, ample high clouds limit confidence for heavy afternoon showers. Although radar presentations remains modest, model cross-sections are actually impressive with how quickly a deep, convergent frontal structure redevelops over central Hawaii. This sets the stage for a rather narrow band of fairly stationary shower activity to develop over or in the vicinity of Oahu tonight.

The hi-res guidance is very aggressive in depicting heavy rainfall potential, though these models tend to run hot in moisture-rich environments. Even so, the global models also key in on a narrow band of moderate to heavy rain that may not move much for 24 hours or so. Several inches of rain will be possible beneath this band, which is most likely to set up somewhere between the Kauai Channel and Molokai, though Kauai and western Maui are not out of the game. At this time, Oahu appears to be the highest probability landing spot, but details governing the ultimate position of the frontal band are likely to be lost in the noise, and uncertainty remains high until it becomes evident on radar. Uncertainty is high enough to warrant keeping Big Island in the statewide Flood Watch, but the probability of meaningful rainfall is lowest there.

Weather Details for the Hawaiian Islands…as of 348am Saturday morning: A residual axis of deep tropical moisture with bands of moderate to heavy showers remains focused over the eastern end of the state this morning, with Maui and the Big Island continuing to face the potential for heavy rain. The shortwave responsible for the most organized large-scale lift over the past couple of days continues to pull north and away from the state. As a result, rainfall intensity should steadily diminish somewhat through the day.

Elsewhere across the state, conditions are expected to remain somewhat quieter through the day, with only a few passing showers and overall lower rainfall chances, especially across Kauai and Oahu, where drier air has already begun to fill in. This improvement, however, is expected to be temporary. Guidance remains in good agreement showing another shortwave rotating through the broad upper trough northwest of the state later tonight into Sunday, and then lingering into early next week.

This feature is expected to once again strengthen large-scale ascent across the region while renewing the deep tropical moisture plume across the islands. As a result, another round of widespread showers with periods of moderate to heavy rainfall appears increasingly likely beginning later tonight, first across the western end of the state, then expanding eastward through Sunday and potentially lingering into early next week. Antecedent conditions are now the primary concern statewide.

With soils remaining saturated, streams elevated, and some areas having already received substantial rainfall totals over the past 48 hours, flooding impacts will be much easier to realize with this next round of heavy rain. While some guidance continues to suggest an additional several inches may be possible over the duration of the next event, exact storm totals are less important than rainfall intensity and duration. Any period of intense rainfall rates could quickly lead to renewed flash flooding and rapid rises in streams. As a result, the Flood Watch is now in effect for all Hawaiian Islands through Monday afternoon.

One notable change heading into the extended period is the wind pattern. The strong southerly winds associated with the initial system over the past couple of days have weakened considerably, with mainly light and variable winds expected from today through much of next week. This lighter flow regime may allow heavier showers to linger over localized areas for longer durations, further increasing the flooding threat.

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 low pressure system that is currently north-northwest of the Hawaiian Islands continues to draw moisture across the area. Showers are continuing across the central and eastern coastal waters, though upper-level support is expected to diminish. A trough will linger in the vicinity of the islands into early next week, however, keeping winds lighter than seasonal average. Additional support for showers and isolated thunderstorms will return to the region by tonight into Sunday.

East of the trough, moderate to fresh southeasterly winds will prevail, while winds west of trough will be light and variable, which may become southerly next week but remain generally light. As southerly winds continue to decline, surf along south-facing shores will return smoother, less choppy conditions. Additionally, the medium-period south swell will gradually decline through the weekend. By Tuesday, however, a new south swell will arrive, once again providing a boost to surf along south facing shores.

A moderate, short to medium-period northwest swell, generated by the gale force low to the northwest will bring a boost to surf along north and west facing shores. Another northwest reinforcement on Sunday will maintain this small to moderate surf through the weekend, followed by a decline in northwest swell energy next week. Surf along east facing shores remains 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 475 NM east-southeast of Navsta, Guam

https://www.metoc.navy.mil/jtwc/products/04W_111800sair.jpg

 

>>>Southwest Pacific Ocean:

Tropical Cyclone 30P (Maila)…is located approximately 534 NM south Kapingamarangi – Final warning

https://www.metoc.navy.mil/jtwc/products/30P_110000sair.jpg

 

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



Interesting:  New Software Could Cut Cooling Energy Use by 25% in Data Centers

Data centers consume millions of homes’ worth of electricity each year, with much of that electricity simply powering the cooling systems that keep the facilities operational. Researchers at Penn State are addressing this inefficiency by using artificial intelligence (AI) to dynamically adjust data centers’ power usage to peak when the weather is favorable and electricity is affordable.

The team developed software, powered by a new physics-based AI learning model, that analyzes real-time climate and economic data to optimize data center cooling. The software works by simulating a virtual data center that serves as a training space for an AI agent — a system that can make highly complex decisions and learn over time. A trained agent can provide cooling recommendations personalized for the climate and economic market of a data center, specifically optimized for a facility’s location.

The new approach is detailed in a paper accepted and set to be presented by the researchers at the IEEE ITherm Conference in May.

Read More: Pennsylvania State University