The latest update to this website was at 903am Monday (HST)

 

Here are the highest temperatures Sunday…and the lowest Monday:

83 – 74  Lihue AP, Kauai
85 – 72  Molokai AP, Molokai
88 – 66  Kahului AP, Maui
85 – 72  Kona AP, Big Island
82 – 65  Hilo, AP, Big Island

>>> There are lots of new locations that measure rainfall and winds now, here’s a map of all areas for your reference (the map is clickable to zoom in closer)

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

1.20  Mount Waialeale, Kauai
0.30  Poamoho RG 1, Oahu
0.10  Honolimaloo, Molokai
0.04  Lanai AP, Lanai
0.18  West Wailuaiki, Maui
2.15  Kealakekua, Big Island

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

17  Port Allen, Kauai
22  Palehua, Oahu
22  Makapulapai, Molokai
20  Lanai 1, Lanai
23  Honolua, Maui
22  South Point, 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/GOES17/ABI/SECTOR/tpw/13/GOES17-TPW-13-900x540.gif 

 A cold front northwest…thunderstorms far south


https://cdn.star.nesdis.noaa.gov/GOES17/ABI/SECTOR/hi/GEOCOLOR/GOES17-HI-GEOCOLOR-600x600.gif

Low clouds being carried our way on the trade winds

 

https://cdn.star.nesdis.noaa.gov/GOES17/ABI/SECTOR/hi/13/GOES17-HI-13-600x600.gif

A few high clouds in our general area

 

https://radar.weather.gov/ridge/standard/HAWAII_loop.gif

Localized showers

 

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

Kauai and Oahu (Satellite)

 

https://radar.weather.gov/ridge/standard/PHKI_loop.gif

Kauai and Oahu (Radar)

 

https://www.weather.gov/images/hfo/satellite/Oahu-Maui_VIS_loop.gif

Oahu and Maui County (Satellite)

 

https://radar.weather.gov/ridge/standard/PHMO_loop.gif

Oahu and Maui County (Radar)

 

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

 Maui, Kahoolawe, Lanai, and the Big Island (Satellite)

 

https://radar.weather.gov/ridge/standard/PHKM_loop.gif

Maui County and the Big Island (Radar)

 

https://radar.weather.gov/ridge/standard/PHWA_loop.gif

Big Island (Radar)

 

Model showing precipitation through 8-days (you can slow this animation down)

 

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

~~~ Hawaii Weather Narrative ~~~

 

Glenn’s Monday comments:  I’m home here in upper Kula, Maui, Hawaii.

It’s mostly clear here in Maui County this morning. The low temperature here at my place was 50.5 degrees.

Weather Wit of the day:  Current Conditions – When the weather is more like it is now than it’s ever been

 

>>> 2025 Hurricane Season Outlook

NOAA Central Pacific Hurricane Center and the Climate Prediction Center announced a 30% chance of below-normal tropical cyclone activity for the upcoming central Pacific Hurricane Season. The 2025 outlook also indicates a 50% chance of a near-normal hurricane season and a 20% chance that it will be above-normal.

In terms of storm numbers, the forecast calls for 1-4 tropical cyclones across the central Pacific, which is located north of the equator between 140°W and the International Date Line. A near-normal season has 4 or 5 tropical cyclones. Tropical cyclones include tropical depressions, tropical storms and hurricanes.

The outlook is a guide to the overall seasonal tropical cyclone activity in the central Pacific basin, and does not predict whether or how many of these systems will affect Hawaii. The central Pacific hurricane season begins June 1 and runs through November 30.

 

>>> Dry season (May through September 2025) outlook

— Probabilities (74%) favor ENSO-neutral conditions to persist through the summer and a 50% chance of continuing through October.

— NOAA Climate Prediction Center’s forecast probabilities and model consensus favor above normal precipitation across Kauai and Oahu, below normal precipitation for Big Island, and equal chances of above, below, and near normal precipitation across Maui County through much of the dry season. Toward the end of the dry season and into the start of the 2025–2026 wet season, the forecast shifts towards equal chances of above, below, and near normal precipitation as signals in forecast guidance weaken.

— Precipitation is inherently difficult to forecast during ENSO-neutral conditions due to a lack of a significant driver (El Niño or La Niña) directing the path of weather systems and more predictable impacts.

— April rainfall on Kauai and Oahu may help delay the onset of significant drought and significant wildfire risk. All of Maui County and the Big Island enter the dry season in moderate drought (D1) or worse, with a higher risk for drought continuing or worsening and a higher chance for significant wildfires.

— Impacts are expected to be the worst for non-irrigated agriculture, water systems dependent on surface water diversions, and residents relying on rainfall catchment.

 

Hawaii’s Broad Brush Weather Overview:  A high pressure ridge north of the Hawaiian Islands will remain slightly weakened by a stalled frontal boundary far northwest of the state. Expect light to moderate easterly trade winds today, becoming moderate to locally breezy from Tuesday onward.

An upper level trough and embedded lows will keep some shower activity over us this week. Brief periods of showers remain in the forecast favoring the typical windward and mountain areas. Increasing shower trends and thunderstorms are possible Thursday into Friday with more stable trends returning by the weekend.

Hawaii’s Weather Details:  Satellite imagery shows a few weak upper lows drifting along a narrow west to east oriented trough. The upper low that produced periods of showers over the past few days continues to weaken and drift northward farther away from the island chain. More stable conditions are anticipated as a result, with lower shower coverage statewide lasting into Wednesday.

Several bands of clouds linger in the trade wind flow moving towards each island, however the steering winds on these clouds is slightly from a more southeast direction, driving these clouds more parallel to most island mountains. The southeast and east slopes of the Big Island are the exception to this rule, with some enhanced showers favored over the Kau and Puna Districts of the island during the daytime and evening hours.

Local radar imagery shows scattered pockets of showers moving up into windward mountain slopes on the trade winds. These passing shower trends will show decreasing trends a few hours after sunrise, then show increasing trends during the overnight to early morning hours the next day. Weather balloon soundings show temperature inversion heights as measured at Lihue and Hilo are roughly between 5,000 to 7,000 feet. These heights indicate a fairly typical trade wind weather pattern with brief passing showers.

The overall weather pattern remains fairly consistent with the subtropical ridge locked in place north of the state. A few wrinkles in the forecast include a slight increase in trade wind speeds from Tuesday onward, as the stalled front far northwest of the state dissipates, allowing the ridge to strengthen slightly across the region.

Another wrinkle to the forecast will occur with the shower activity. Less shower coverage remains in the forecast through Wednesday as the upper low drifts farther away, increasing stability. By Thursday, another stronger low pressure system moves in from the north and anchors over the western islands by Wednesday night. Instability aloft associated with the cold air and wind divergence surrounding this low will briefly increasing showers on Thursday and Friday, some of these showers may be heavy at times.

More stable trends return by the weekend with temperature inversion heights in the 5,000 to 6,000 foot range, capping shower development statewide.

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 / Vog map animation

Hawaii’s Marine Environment:  Surface high pressure will remain anchored far northeast of the state through mid-week, followed by another surface high building north of the region by late-week. Moderate to locally fresh easterly trades should keep conditions just below Small Craft Advisory (SCA) criteria today. However, a slight uptick in trades starting Tuesday will likely lead to a SCA issuance for the typical windy waters around Maui and the Big Island. A lingering upper level disturbance will allow for brief periods of wet weather for the next several days.

A series of small south and south-southwest swells will maintain small south shore through mid-week. A slightly larger long period south swell will further boost south shore surf up to seasonal averages late Thursday through early this weekend.

Surf heights along north and west-facing shores will remain small during the next 7 days. Surf heights along east-facing shores will remain small but choppy today, then become slightly large Tuesday onward as trade winds increase a bit.

 



World-wide Tropical Cyclone Activity

 

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

Northeastern Pacific:  There are no active tropical cyclones

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

North Central Pacific:  There are no active tropical cyclones

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

Northwest Pacific Ocean:  There are no active tropical cyclones

Southwest Pacific Ocean:  There are no active tropical cyclones

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

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:  A Vicious Cycle: How Methane Emissions From Warming Wetlands Could Exacerbate Climate Change

Warming in the Arctic is intensifying methane emissions, contributing to a vicious feedback loop that could accelerate climate change even more, according to a new study published May 7 in Nature.

“Methane is a very potent greenhouse gas that we need to address urgently,” said co-author Xin (Lindsay) Lan, a climate scientist at CU Boulder’s Cooperative Institute for Research in Environmental Sciences (CIRES). “Our study suggests that a significant portion of the recent rise in atmospheric methane originates from natural sources driven by climate change.Our emission reduction efforts need to be more aggressive.”

Methane is the second most abundant human-produced greenhouse gas after carbon dioxide. But an equal amount of methane traps about 30 times more heat than CO? over a 100-year time frame. Methane has been responsible for roughly a quarter of the planet’s warming since the Industrial Revolution.

Read More: University of Colorado Boulder