The latest update to this website was at 506pm Monday (HST)

 

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

87 – 76  Lihue AP, Kauai
90 – 74  Molokai AP, Molokai
91 – 70  Kahului AP, Maui – Record high Monday – 94 in 1979
87 – 77  Kona AP, Big Island
87 – 73  Hilo, AP, Big Island

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

0.94  Mount Waialeale, Kauai
0.38  Makaha Stream, Oahu
0.06  Puu Alii, Molokai
0.00  Lanai
0.50  West Wailuaiki, Maui
0.93  Piihonua, Big Island

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

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

27  Port Allen, Kauai
27  Oahu Forest NWR, Oahu
28  Makapulapai, Molokai
27  Lanai 1, Lanai
36  Na Kula, Maui
29  Kealakomo, 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/13/1800x1080.jpg

Thunderstorms south…north-northwest and west

 

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

Low clouds in our vicinity…along with high level clouds southeast 

 

https://radar.weather.gov/ridge/standard/HAWAII_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 Monday comments:  I’m home here in upper Kula, Maui, Hawaii.

It’s partly cloudy here in Maui County early this morning, with a few exceptions.  The low temperature at my place was 57.5 degrees.

1209pm, it’s gotten cloudy here in upper Kula, although looking down towards the north shore, Maalaea Bay, and the south shore, it’s still sunny as we head into the afternoon hours.

Weather Wit of the day:  Clear Air Violation – A fragrant abuse of the law

>>> Highest Temperature Monday, August 18, 2025 – 113 at Death Valley, California
>>> Lowest Temperature Monday, August 18, 2025 – 27 near Bynum, Montana

 

Hawaii’s Broad Brush Weather Overview:  Breezy trade winds will gradually return today, as weak trough moves west of the state tonight. Scattered clouds and showers will persist through the morning hours mainly along windward and mountain areas, with few showers spilling over the leeward areas at times. A gradual drying trend is expected tonight into Tuesday, with typical summer time trade wind weather (stable and mostly dry conditions) expected during the second half of the week.

Hawaii’s Weather Details: A weak surface trough associated with the remnants of former Tropical Cyclone Ivo will continue to move west over the state today, allowing trade wind speeds to increase throughout the day. This morning sounding from Lihue shows trade wind inversion height around 9,000 feet with precipitable water vapor values around 1.68 inches.

Scattered, light to moderate showers can be seen on the radar early this morning, mainly focused over windward and mountain areas, with some showers spilling over to leeward areas at times. Expect showers to ease slightly during the day as drier air filters in from the east, except for the Kona slopes of the Big Island, which will see some clouds and shower development this afternoon as sea breezes develop.

As this trough exits the area tonight, we should see less clouds and drier conditions on Tuesday. Trade winds will continue to strengthen Tuesday afternoon, with moderate to locally breezy trades expected throughout the rest of the week. Typical summer time trade wind weather is expected throughout the second half of the week, with stable and mostly dry conditions. Subtle increases of moisture will bring in some windward showers at times, with mostly dry conditions persisting over leeward areas. Trade winds could slightly strengthen by the weekend.

Fire weather:  Conditions should remain below critical fire weather thresholds through the first half of this week. A weak low-level trough will continue to move across the state, bringing an increase in humidity and shower activity and weakening the trade wind inversion. Atmospheric sounding from Lihue shows the trade wind inversion has lifted from 5,000 feet to 9,000 feet.

As the trough exits the area, we should see the return of stable and dry conditions by Tuesday afternoon. During the second half of the week we should see stable and dry conditions with a stronger trade wind inversion at around 5,000-6,000 ft. Breezy trades are also expected during this time, which could produce elevated fire weather concerns later in the week through the weekend.

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:  Fresh to locally strong trades will persist through the week as ridging stays situated north of the state. The Small Craft Advisory (SCA), for the typical windy waters around Maui and the Big Island, will remain in effect through at least Wednesday morning, with a likely extension into the weekend.

The ongoing small, medium period south (180-190) swell will hold through Tuesday and generate waist to near head high surf within higher sets. A slightly larger, medium to long period, south swell is forecast to arrive on Wednesday, adding a little bump to surf heights along south facing shores through the remainder of the work week.

Choppy conditions will continue for east-facing shores through the forecast period, due to the persistent fresh trades. Meanwhile, expect surf to be flat to tiny along north facing shores.

 



World-wide Tropical Cyclone Activity

 

Atlantic Ocean:  

Tropical Cyclone Erin…is 780 miles south-southeast of Cape Hatteras, North Carolina

ERIN MOVING NORTHWESTWARD TO THE EAST OF THE BAHAMAS…EXPECTED TO BRING HIGH SURF AND POSSIBLE TROPICAL STORM CONDITIONS TO PARTS OF THE BAHAMAS AND THE U.S. ATLANTIC COAST

According to the NHC advisory number 31

Erin is moving toward the northwest near 8 mph, and this motion is expected to continue tonight. A turn to the north is forecast on Tuesday or Tuesday night. On the forecast track, the core of Erin is expected to move away from the southeastern Bahamas and the Turks and Caicos Islands tonight and move east of the remainder of the Bahamas on Tuesday. The hurricane is then expected to move between Bermuda and the east coast of the United States by the middle of the week. Reports from Air Force Reserve and NOAA Hurricane Hunter aircraft indicate that maximum sustained winds are now near 125 mph with higher gusts. Erin is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. Fluctuations in strength are expected during the next couple of days. However, Erin is likely to remain a dangerous major hurricane through the middle of this week. Hurricane-force winds extend outward up to 80 miles  from the center and tropical-storm-force winds extend outward up to 230 miles.

cone graphic

 

Tropical Atlantic

>>> A tropical wave located over the central tropical Atlantic is producing some disorganized showers and thunderstorms. Environmental conditions appear conducive for gradual development of this system, and a tropical depression could form toward the end of the week. This system should move westward to west-northwestward at about 20 mph across the central tropical Atlantic and approach the vicinity of the Leeward Islands on Friday.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…medium…60 percent

 

Eastern Tropical Atlantic

>>> A tropical wave located just off the coast of Africa is producing a persistent cluster of disorganized showers and thunderstorms. Some slight development of this system is possible over the next day or two as it moves westward at around 15 mph. On Thursday, this system should reach a less favorable environment, which should reduce its chances for development.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…10 percent

 

Caribbean Sea:  There are no active tropical cyclones

Tropical cyclone formation is not expected during the next 7-days.

Gulf of America:  There are no active tropical cyclones

 

Northeastern Pacific

Tropical cyclone formation is not expected over the next 7 days.

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

 

North Central Pacific: 

Tropical cyclone formation is not expected over the next 7 days.

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

 

Northwest Pacific Ocean: 

Tropical Cyclone 17W…is located approximately 79 NM east of Hanoi, Vietnam – Final Warning

https://www.metoc.navy.mil/jtwc/products/wp1725.gif

Southwest Pacific Ocean:  There are no active tropical cyclones

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

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:  As the Atmosphere Changes, so Will Its Response to Geomagnetic Storms

Satellite operators can expect less density during space weather events.

Rising concentrations of carbon dioxide in the upper atmosphere will change the way geomagnetic storms impact Earth, with potential implications for thousands of orbiting satellites, according to new research led by scientists at the US. National Science Foundation National Center for Atmospheric Research (NSF NCAR).

Geomagnetic storms, caused by massive eruptions of charged particles from the surface of the Sun that buffet Earth’s atmosphere, are a growing challenge for our technologically dependent society. The storms temporarily increase the density of the upper atmosphere and therefore the drag on satellites, which impacts their speed, altitude, and how long they remain operational.

The new study used an advanced computer model to determine that the upper atmosphere’s density will be lower during a future geomagnetic storm compared with a present-day storm of the same intensity. That’s because the baseline density will be lower, and future storms won’t increase it to levels as high as what occurs with storms currently.

Read More: National Center for Atmospheric Research/University Corporation for Atmospheric Research