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Why so windy this spring?

Why so windy this spring?

Bay of Islands wind and barometer over past month…..

From climatereanalyzer.org/clim/sst_daily/

There has been a SSW (sudden stratospheric warming) in Antarctica. The following notes are from www.weatherzone.com.au/news

The polar vortex extends from the surface up to the stratosphere. The stratospheric polar vortex sits about 10 to 50 km above Earth’s surface and over the pole. This section of the polar vortex is strong and typically shaped like a circle or oval. Beneath it lies the tropospheric polar vortex which affects weather patterns by changing the shape and behaviour of the polar jet stream.

Bob McDavitt

MetBob. Bob McDavitt is the weather guru that uses //etBoB to provide meteorological information for cruising sailors, primarily for those in the South Pacific.

Sudden stratospheric warming

A Sudden Stratospheric Warming (SSW) is a rapid increase in temperature in the polar stratosphere triggered by sinking air. These stratospheric warming episodes can filter downwards through the atmosphere, weaken the polar vortex and allow disturbed westerly winds to spread equator-wards.

The recent SSW is shown in the video below:

This weakened the polar vortex to weaken, allowing the polar jet stream to drag cold air away from Antarctica, and bringing more westerly winds than normal to New Zealand.  This can be measured by negative values of the Southern Annular Mode (SAM), I use the AAO (Antarctic Oscillation) as a proxy for SAM and indeed the forecasts in red below are showing it may well be negative next few weeks:

This would make the following conditions more likely in

  • More westerly winds= wet over the Southern Alps, hot and dry for Canterbury plains. Squally for Bay of Islands.

So that explains our recent dramatic weather.

2025-10-11T03:45:31+13:0011 October 2025|Weather|

Bay of Islands ITM – October’s Sponsor of the Month

We are delighted to spotlight Bay of Islands ITM as Opua Cruising Club’s Sponsor of the Month for October. As part of the wider ITM network – New Zealand’s leading co-operative of independent building supply specialists – Bay of Islands ITM brings trade-grade materials, local knowledge, and a community spirit right here in the mid-north.

What they do

Located at 2 Haruru Falls Road, Haruru, Bay of Islands ITM caters to both tradespeople and DIY enthusiasts with expertise in:

  • Building material supplies & advice
  • Frame & truss systems
  • Pole sheds & structural timber work

They operate Monday to Friday: 7:00 am – 5:00 pm, and Saturday: 8:30 am – 12:30 pm

Why they matter to our community

Bay of Islands ITM is more than just a supplier – they are a local institution. They describe themselves as “the only privately-owned and operated building supplies store in the mid north,” emphasising that they “cater to our tough Trade guys and the DIY’ers … from timber to paint … if we don’t have it, we’ll get it for you.”  

Their team brings nearly 250 years of combined building industry experience, giving them the depth to advise on projects of all sizes.

Opua Cruising Club is proud to have Bay of Islands ITM supporting our local sailing community.

For more information visit www.itm.co.nz/stores/bay-of-islands-itm-paihia

2025-10-08T06:59:35+13:001 October 2025|General, News, Social|

Open day a great sucess

The Opua Cruising Club’s Open Day on Sunday couldn’t have asked for better weather – warm, sunny, and just right for being out on the water! The clubhouse was buzzing from the start of the morning, with everyone tucking into delicious breakfasts and catching up with friends old and new. A highlight on shore was the official blessing of the club’s brand-new flagpole, with glasses of ice-cold champagne raised high to mark the occasion and set the tone for a season full of good sailing and good company.

Out on the water, the racing brought plenty of energy and laughter. For our ‘have a go’ guests who had never sailed before, it was an unforgettable introduction to the sport – the mix of sunshine, sea breeze, and the thrill of the race left plenty of wide smiles.

The combination of fun competition, friendly hospitality, and the beautiful Bay of Islands setting made the open day a true celebration of what the Opua Cruising Club is all about.

2025-09-29T04:50:26+13:0029 September 2025|General, News, Social|

Quiz night raises over $10K

The OutFit North Fundraiser quiz night at Opua Cruising Club was a resounding success, drawing in a full house of supporters eager to rally behind a worthy cause.

Thanks to the incredible efforts of the organisers (with special thanks to Nadine and her team and Dan the quizmaster) and everyone who took part, over $10,000 was raised in one evening.

The funds will go directly to support three of the club’s much-loved members who are currently battling cancer, offering them practical help and a powerful reminder that they are not facing their fight alone. It was more than just a quiz night – it was an inspiring show of community strength, compassion, and hope.

2025-09-30T22:47:18+13:0028 September 2025|General, News, Social|

Introducing RONI

A more indicative measure of ENSO…Introducing  RONI

ENSO stands for El Nino- Southern Oscillation

The EN part of this parameter deals with sea temperature. We have been using the sea surface temperature measured in the Nino3-4 area as the parameter for deciding if the atmosphere is being driven by El Nino or La Nino or is in between the two in neutral gear.

The SO part deals with the isobaric pressure difference between Darwin and Tahiti… located on this map:

From climatereanalyzer.org/clim/sst_daily/
Bob McDavitt

MetBob. Bob McDavitt is the weather guru that uses //etBoB to provide meteorological information for cruising sailors, primarily for those in the South Pacific.

However, climate change has been raising the world’s average sea temperate in a roller-coaster fashion

From www.moanaproject.org/marine-heatwave-forecast

o try and remove this trend from the measurements, climatologists in Australia and NZ have introduced a new measure called the RELATIVE OCEANIC NINO INDICIES (RONI).

As seen at https://www.bom.gov.au/climate/enso/ 

Relative Oceanic Niño indices RONI

RONI measures sea surface temperature anomalies in the Niño regions but mathematically removes any long-term trend found in the tropical region temperature. This helps relate the value more closely to localised processes associated with ENSO, rather than larger-scale tropical SST features such as global warming.

RONI values are scaled to have the same variance as the traditional index. Anything more than 0.8C above normal is in El Niño territory, and anything less than -0.8 is in La Niña territory.  This is what REL NINO 3-4 looks like from April 2021to Sep 2025.

It gives a good view of the El Nino in late 23/early 24 and the La Nina of late 24/early 25 and shows a neutral trend in recent data.

The RONI is forecast to have a 55% chance of getting into La Niña territory by the end of the year.  It is close to a coin toss, and if it comes down as La Niña then this summer in Northland may be like last summer.

2025-09-26T02:58:47+12:0026 September 2025|Weather|

Open Day 2025

Spring is finally here and with it comes the highly anticipated Opening Day of the 2025-26 sailing season at Opua Cruising Club.

The Commodore invites you to celebrate the start of the new sailing season on Sunday the 28th September 2025. There will be a full day of activities, including a special Race Day breakfast, opening of the new flagpole, champagne on deck, first race of the season, live music and more. This event is open to everyone, whether you’re a sailor or not. Come along, bring the family and spend some time looking out over the water from our beautiful clubhouse.

There will be a chance for anyone wanting to experience the thrill of being part of a yacht race to tag along as a passenger. We still have a few crew spots if you’d like to “Have a Go”. Just bring a hat, sunscreen, a warm top and flat shoes such as trainers. We’ll provide everything else you need.*

If that sounds too much like hard work, you can just sit back and relax, enjoy watching the racing and have a bite to eat. Food and drinks will be available from the club’s bistro, The Galley, throughout the day.

Remember, this event is open to everyone, so please tell your friends and family!

* Please note that booking ahead is advised. Please call Terry on 021 152 7584 for more information.

2025-09-18T01:17:20+12:0017 September 2025|General, News, Social|

Draw Update

There was a great turnout of Members for our Annual Draw on Saturday.  Adele Earnshaw was one of 12 lucky Members to win one of an impressive array of prizes.  She also won the auction for a very nice OCC Jacket that had been won by Brian Cripps and generously gifted back to the Club by him, thank you Brian!

As always, the Club social programme would not be possible without the generous support of our sponsors, Opua Boatyard, who provided the top prize for boatyard services, which was won by Mark Boyle.

Photos taken by Paulette Smith.

2025-09-17T23:49:41+12:0011 September 2025|General, News, Social|

Solo Trans-Tasman Challenge 2026 – OCC Update

Planning and momentum are building fast for the 16th Solo Trans-Tasman Challenge, set to start from Opua on 30 May 2026. As the Organising Authority, Opua Cruising Club is stepping into an exciting new chapter, carrying forward the legacy of this legendary race while putting our club and community at the very centre of international sailing attention.

A Legendary Event

First held in 1970, the Solo Trans-Tasman is the longest-running singlehanded ocean race in the Southern Hemisphere and still the only one of its kind. With a reputation for testing courage, seamanship, and endurance over 1,200 nautical miles of Tasman Sea, it has produced countless stories of resilience and adventure. This is not a race for professionals chasing silverware, but for Corinthian adventurers — everyday men and women who prepare for years to test themselves against one of the world’s great oceans.

The Fleet is Growing

Since our last update, the fleet has expanded to nine confirmed entries – five from New Zealand and four from Australia – with strong interest from more than ten additional skippers, including veterans keen for another go. This is shaping up to be a true trans-Tasman contest, with Kiwi yachts taking the last two wins and Australian sailors hungry to bring the trophy back across the ditch.

With divisions for Adventure Monohull, Adventure Multihull, and PHRF, plus the prestigious Sir Francis Chichester Trophy for line honours, the competition promises to be fierce and diverse.

What It Means for OCC

Hosting the start from Opua brings many benefits:

  • International profile for OCC as organiser of a world-renowned ocean race.
  • Engagement opportunities for members to be involved in race management, shore activities, and festivities.
  • Stronger connections with Southport Yacht Club, reinforcing the spirit of trans-Tasman sailing.
  • Boosts to local economy and tourism through visiting competitors, supporters, and media.

In the week leading up to the start, OCC and the Bay of Islands community will enjoy a vibrant race village on the Opua Superyacht Dock, creating a celebratory atmosphere for sailors, members, and visitors alike.

Sponsorship – A Unique Opportunity

The Solo Trans-Tasman Challenge offers businesses a chance to stand alongside one of the world’s great ocean races. Sponsorship provides:

  • Brand visibility across New Zealand, Australia, and international sailing communities.
  • On-water and online exposure through event websites, social media, merchandise, and race media coverage.
  • Engagement opportunities in the pre-race village at Opua and post-race celebrations at Southport.
  • Creative activations such as product showcases, customer competitions, and partnerships with competing skippers.
  • Global digital reach through the official Virtual Regatta edition of the race, where thousands of eSailors will compete on the same course in real time.

Sponsorship can be tailored to suit companies of all sizes, from naming rights to supporting specific trophies, prizes, or digital initiatives. For local businesses and distributors, it’s a chance to connect directly with sailing and adventure audiences across both sides of the Tasman.

Looking Ahead

Entries are open until October 2025, with late entries accepted into March 2026. The Race Management team is working hard behind the scenes, and with the support of our members, sponsors, and community, this promises to be one of the most memorable editions yet.

We encourage all members to spread the word, get involved, and help us showcase OCC at its best. If you or your business would like to explore sponsorship opportunities, please get in touch.

Contact: race@transtasmanchallenge.org


Julie Kidman
Solo Trans-Tasman Race Management

For more information, visit solo-tasman.co.nz

2025-09-08T22:51:33+12:008 September 2025|General, Racing|

Members Draw Saturday 6th

It’s the Opua Cruising Club Members’ draw this Saturday!

To participate, members will need to be on the Club premises prior to 6.30pm this Saturday, 6th September, with their current Membership Card to enter. Please note that anyone who has paid membership for 2025-26 but has not collected their cards can do so from the bar or office.

The draw will start promptly at 6.30pm.  Membership cards will be collected and used to identify the winners, who will each pick a number to identify the prize they have won.

Twelve Members will win a prize each.  Prizes include generous vouchers from local businesses, some very nice wet weather gear, boatyard services and bar products.

Anyone unable to utilise a prize they have won is welcome to put it up for auction so other members can bid for it.

The Prize Draw will be completed by 7.00pm as the All Blacks v South Africa live on sky kick-offs at 7.05pm.

2025-09-17T23:49:57+12:004 September 2025|General|
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