Glenn James
Hawaii Weather Today
Founder and maintainer for 30 years


The latest update to this website was  419am Monday morning HST


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

0.56  Waialae, Kauai 
1.18  Palisades, Oahu
2.89  Puu Alii, Molokai
1.67  Lanai City, Lanai
3.74  Kahakuloa, Maui
3.16  Keahuolu, Big Island


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

28  Barking Sands, Kauai – SE
14  Oahu Forest NWR, Oahu – ENE
22  Makapulapai, Molokai – ESE
25  Lanai 1,  Lanai – SW 
24  Nene Nest, Maui – S 
18  Upolu AP, Big Island – NE


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

 


https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261030440-20261031230-GOES18-ABI-HI-GEOCOLOR-600x600.gif

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

 

>>> 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 Monday, April 13, 2026 –  11 degrees Lund, NV

 

Hawaii’s Broad Brush Weather Overview…as of 358am Monday morning:  Light to moderate rain continues across the western portion of the state, as the rain band gradually meanders away from the islands. Light and variable winds will favor some onshore sea breezes through mid-week. By the latter half of the week, light trades and quiet weather returns.

Weather Details for the Hawaiian Islands…as of 358am Monday morning: Latest radar imagery continues to show remnant showers developing across the smaller Hawaiian Islands. These showers have been showing predominately less than a tenth of an inch per hour across the state, with some locally higher amounts across leeward Big Island. The threat for widespread flash flooding has decreased across the Hawaiian Islands, therefore, the Flood Watch has been cancelled. However, due to lingering moisture and saturated grounds, some minor flooding may still occur in areas affected by heavy showers.

Winds across the state are anticipated to be light and variable beginning tomorrow, favoring onshore sea breezes each afternoon, which may result in some showers as the lingering airmass over the islands remains moisture-rich. Moreover, high humidity levels that will persist until the trades return. A broad area of high pressure quickly builds in the rainbands wake, opening the door for light trades to make a return by the latter half of the week. Trades remain quite light and are not expected to make much of a profound effect on the local humidity levels. However, for the first time in several weeks, there is no potential event forthcoming for the Hawaiian Islands!

 

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 remains draped over the central islands, extending from a low pressure system far north-northwest of the area. Moderate to fresh easterly winds will persist to the east of the trough, while light to moderate southerly winds occur to the west. This weak surface boundary along with an upper level disturbance moving over the region, will continue to bring showers and the potential for isolated thunderstorms through mid-week.

The surface trough lifts northwest in the latter half of the week, and high pressure to the northeast will begin to take over at the surface, causing gentle to moderate easterly trades to gradually develop across the Hawaiian coastal waters by the weekend. A small, medium-period northwest swell will diminish. However, small surf will be maintained along north and west facing shores by a reinforcing pulse on Tuesday. Following this, northwest swell energy declines through the rest of the week.

A medium-period, south swell will continue to decline as well. A new south swell arrives on Tuesday, 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 through next week.

 

r/pics - a rainbow over the ocean.

 Rainy weather 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 203 NM east-southeast of Navsta, Guam

https://www.metoc.navy.mil/jtwc/products/04W_130600sair.jpg

 

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

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



Interesting:  MIT Researchers Measure Traffic Emissions, to the Block, in Real-Time

A new study pieces together existing data sources in order to develop a detailed, dynamic picture of auto emissions.

In a study focused on New York City, MIT researchers have shown that existing sensors and mobile data can be used to generate a near real-time, high-resolution picture of auto emissions, which could be used to develop local transportation and decarbonization policies.

The new method produces much more detailed data than some other common approaches, which use intermittent samples of vehicle emissions. The researchers say it is also more practical and scales up better than some studies that have aimed for very granular emissions data from a small number of automobiles at once. The work helps bridge the gap between less-detailed citywide emissions inventories and highly detailed analyses based on individual vehicles.

“Our model, by combining real-time traffic cameras with multiple data sources, allows extrapolating very detailed emission maps, down to a single road and hour of the day,” says Paolo Santi, a principal research scientist in the MIT Senseable City Lab and co-author of a new paper detailing the project’s results. “Such detailed information can prove very helpful to support decision-making and understand effects of traffic and mobility interventions.”

Read More: Massachusetts Institute of Technology (MIT)