The latest update to this website was at 533am Monday (HST)

 

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

81 – 72  Lihue AP, Kauai
87 – 69  Molokai AP, Molokai
90 – 70  Kahului AP, Maui
84 – 76  Kona AP, Big Island
84 – 70  Hilo, AP, Big Island

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

0.69  Mount Waialeale, Kauai
1.70  Poamoho RG 1, Oahu
0.22  Puu Alii, Molokai
0.10  Lanai 1, Lanai
0.16  Keokea, Maui
0.65  Puuanahulu, 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)

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

17  Nawiliwili, Kauai
30  Oahu Forest NWR, Oahu
30  Makapulapai, Molokai
15  Lanai 1, Lanai
27  Kapalua, Maui
24  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 

 Cold Front northwest…thunderstorms in the deeper tropics


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…higher clouds arriving from the southwest

 

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

Partly to mostly cloudy skies

 

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 partly cloudy here in Maui County this morning. The low temperature here at my place was 57 degrees.

Weather Wit of the day:  Clear Air Turbulence – When you get whitecaps in the coffee cups

 

Hawaii’s Broad Brush Weather Overview:  High pressure located far northeast of the islands is still the main driver to these recent light to locally breezy winds. A weak surface trough west of the state will maintain an east to southeast component to the winds. Energy diving into a broad upper level trough west of the state, with higher moisture streaming in from the southwest ahead of this trough, will increase the chance of more frequent shower activity over the western half of the island chain today.

An east-southeast flow pattern this afternoon will likely focus showers along more eastern-facing exposures and mountain slopes. Sheltered leeward areas will experience daytime sea breeze-induced thicker clouds and intermittent rain. Trades will return by Tuesday night, and this will focus showers over windward-facing upslope and higher terrain. This typical trade pattern will hold through the remainder of the week.

Hawaii’s Weather Details:  Satellite and radar imagery continue to show the dominant east-southeast steering flow in the lower level cloud field with widely scattered shower activity. The slightly veered southeast wind profile is a result of a broad upper trough and weak surface reflection located just west-northwest of Hawaii. A dense cirrus deck shrouds the majority of the island chain, as southwesterly moisture rides up ahead of this broad troughing.

A dominant ridge centered far north-northeast of the area is still the main driver to this generally easterly trade wind pattern. Energy moving south into the trough to our west will maintain higher rain chances over Kauai and surrounding waters.

Light to locally breezy east to southeasterly low level flow pattern is expected to continue through the day. Clouds and showers will favor windward and mountain areas during the overnight to early morning hours…with sea breezes developing over leeward and interior areas during the afternoon hours, that will increase daytime showers over these communities.

This flow may also create low level convergent boundaries, or plumes, that will form downstream of each island. These plumes could be the catalyst to higher rainfall across neighboring downstream islands, due to a more parallel flow along the island chain. Enhanced shower activity may occur across the western end of the state into the late afternoon hours, due to higher instability aloft and low level moisture upper troughing west of Kauai.

A return to breezy and more stable trade wind weather is expected tonight, as upper riding expanding in from the northeast, with drier mid layer air moving in from the east. An easterly trade wind pattern will hold through the middle of the week, with showers favoring windward and mountain areas…primarily dry conditions will prevail elsewhere.

For the latter part of the week, trades will slightly ease as weak upper level troughing moves overhead, and another broad surface trough develops west of the state. However, the instability associated with the trough aloft and the available moisture look rather meager. Thus, not much more than perhaps a slight enhancement of trade wind showers is forecast for the end of the week.

Vog will continue to filter across the island chain trapped within wind flow, transitioning west and further south of the smaller islands by the middle of the week as the trades return.

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:  Fresh east-southeast winds will occur in response to an upper low and associated surface trough west of Hawaii. The trough will move westward and allow surface ridging to expand down from the north. This will result in trade winds backing to a more easterly direction. A Small Craft Advisory (SCA) is in effect for winds over the typical windy waters in addition to the windward Maui waters. The SCA will be in effect for the typically windy waters surrounding Maui and Big Island through Tuesday night.

The late season northwest swell will continue its decline, with north and west-facing shore surf dropping to near June averages by Tuesday.

Surf along south-facing shores will continue to see a mix of small background swell the next few days, followed by small southwest swells late Tuesday and Wednesday. A larger, longer period south-southwest swell will build in Friday and peak over the weekend. This should produce above seasonal average surf along many southern beaches.

East-facing shore surf will gradually build to near or above seasonal averages through Wednesday, due to fresh to locally strong trades over and upstream of the islands.

 



World-wide Tropical Cyclone Activity

 

Atlantic Ocean:  There are no active tropical cyclones

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

Caribbean Sea:  There are no active tropical cyclones

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

Gulf of Mexico:  There are no active tropical cyclones

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

The long-term averages for the number of named storms, hurricanes, and major hurricanes are 14, 7, and 3, respectively.

Northeastern Pacific:   There are no active tropical cyclones

Offshore of Central America and Southern Mexico

>>> An area of low pressure is forecast to form offshore of the coast of Central America and southern Mexico during the middle to late portions of this week. Once it forms, the disturbance is expected to move generally westward to west-northwestward around 10 mph. Environmental conditions are expected to be marginally conducive for slow development of this system, and a tropical depression could form by the end of the week.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…medium…40 percent

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

North Central Pacific:  There are no active tropical cyclones

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

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:  Study Finds Coastal Flooding More Frequent Than Previously Thought

Flooding in coastal communities is happening far more often than previously thought, according to a new study from North Carolina State University and the University of North Carolina at Chapel Hill. The study also found major flaws with the widely used approach of using marine water level data to capture instances of flooding.

“Government agencies and researchers use data from tide gauges to measure water levels in coastal areas, then use that data to estimate flood frequency in the region,” says Miyuki Hino, corresponding author of a paper on the study and assistant professor of city and regional planning at UNC. “Those estimates are used both to assess how often flooding has taken place and to predict how often flooding may take place in the future. However, our study shows that this approach does not accurately capture how often flooding takes place or how long those floods last.”

“Due to sea-level rise, we’re now seeing flooding in coastal areas outside of extreme storms like hurricanes,” says Katherine Anarde, co-author of the paper and an assistant professor of coastal engineering at NC State. “There can be flooding during everyday rain showers or at high tide on sunny days. It’s important that the methodology we use to monitor and predict flooding reflects this reality, since sea-level rise means these flooding events are going to become even more common.

Read More: North Carolina State University

A new study finds that coastal flooding happens far more often than previously thought — and that there are major flaws with the widely used approach of using tide gauge data to capture instances of flooding. This photo shows a researcher collecting floodwater samples in Carolina Beach, N.C.