sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery
Sail-World.com : America's Cup: Predictwind - Fresh breeze for Final Day 15
America's Cup: Predictwind - Fresh breeze for Final Day 15


'The America’s Cup Race Course, framed by the Golden Gate Bridge - today the wind blows from right to left, and the ebbing tide flows from left to right against the windflow. The blue sea that can be seen behind the City to the right, is not ocean but the greater expanse of the San Francisco Bay - which exits through the relatively narrow channel under the Bridge.'    Richard Gladwell ©    Click Here to view large photo

A fresh San Fransisco breeze is expected on Day 15, the Final Day, of the 34th America's Cup, for Wednesday, Race 19 of the 2013 America's Cup. The final race is due to start at 1.15pm on Wednesday, local time.

Towards the bottom of this story we feature Predictwind's course routing optimised for wind and tide on the AC race course, and using an AC72 performance profile. It is included to show that the effect of the tide on the race course and race strategies. See bottom of story for the course variations.

For the official line on how the current factor is determined click here Today the tide is flooding (coming in through the Golden Gate) and will negate the previous advantage that exists with an ebbing tide.

With the final race of the regatta set for its regular start time of 1315hrs the wind feeds produced by Predictwind indicate that winds will be around 15-17kts. The feeds produced by Predictwind are close to agreement on the strength at the race start time, and there is only small build in the breeze over the morning.

Officials will add the strength of the tide to set the new wind limit, which will take it just over 24kts. On the basis of this forecast, the winds will be well under that level.

The forecast does not take account of the influence of fog, which can have several effects on the race course winds.

Wind map for September 25, 2013 San Francisco at 1300hrs - Start of Race 19 -  PredictWind.com   Click Here to view large photo

The above image shows the wind speed and direction 1300hrs with breezes expected to be 15-17kts at the start of Race 19 - these are only average speeds and gusts will be higher. The only issue of concern is the more northerly wind direction in some areas of San Francisco Bay, which could affect the set of the course.

Wind graph for September 25, 2013 San Francisco at 1315hrs - Start of Race 19 - indicated by the vertical yellow line. Read the actual data above the graph section -  PredictWind.com   Click Here to view large photo

The second image (above) shows a graphic representation of the wind build - confirming the numbers for the prognosis.

The third chart (below) shows the wind expectations for Wednesday. Note that sea conditions described in this chart are based on open water and are not descriptive of an enclosed harbour

Wind-predictions for September 25, 2013 San Francisco for Wednesday -  PredictWind.com  

The courses optimised by Predictwind for an AC72 show that the optimum course only. The red dotted line shows the Leg 2 course recommended for Race 19. The mark positions used in this projection are only very approximate - and will vary on the course set for the day.

In the second course projection, for Leg 3 the tide is expected to be in flood (incoming) for this race, and boats will need to avoid its effects upwind by taking the city shore.

Downwind course projection September 25, 2013 - Red dotted line is for Race 19 -  PredictWind.com  

Upwind course projection September 25, 2013 - Red dotted line is for Race 19 -  PredictWind.com  


Two weather feeds are used by Predictwind, the key to the accuracy of the forecast lies with the graphs, as when the two lines for the two feeds are quite close together and following each other in the trend, then the likelihood of the forecast is high. If there is separation to any marked degree, then there still some issues to be resolved but usually 24 hours from the race they are well aligned.

The Predictwind model takes various weather feeds and then polishes these, part of this process is factoring in the effect of local topography on the breeze - well demonstrated by the images with the funneling of the breeze.

Developed by former Olympian, Jon Bilger (470, 1992), PredictWind application was used by the Swiss team Alinghi to win the 2003 and 2007 America's Cups, and has become the leading wind system used by racing and recreational sailors around the world. It is available on a subscription basis and also with a free forecast option.

A mobile app for Android and iPhone is available and PredictWind is probably the most used app on the Sail-World iPhone.

Real time local wind observations have been added as further functionality.

You can check the weather anywhere in the world, and get a five day forecast, plus a variety of other features and functions of PredictWind. The app is synchronised with your PC, so that your latest set of locations are always available without resetting each time you change a device.


by Richard Gladwell

  

Click on the FB Like link to post this story to your FB wall

http://www.sail-world.com/index.cfm?nid=115012

12:27 PM Wed 25 Sep 2013GMT


Click here for printer friendly version
Click here to send us feedback or comments about this story.

Click for further information on
2013 America's Cup

Related News Stories:

26 Sep 2013  America's Cup: Monsta's view of the key moments of the 34th Match
25 Sep 2013  America's Cup 2013 Day 14 Press Conference - the pressure mounts
25 Sep 2013  Amerrica's Cup: Images from Bay and Ashore - Day 14
25 Sep 2013  America's Cup: More Images from the Bay - Day 14
25 Sep 2013  America's : More images from Day 14
25 Sep 2013  America's Cup: Images from on the Bay - Day 14
25 Sep 2013  America’s Cup: SHOWDOWN!
25 Sep 2013  America's Cup Final photos by Carlo Borlenghi
25 Sep 2013  America's Cup 2013 Race 19 - NOT Just another race
25 Sep 2013  America's Cup: Oracle Team USA update: Winner takes all
MORE STORIES ...




News - USA and the World

A beautiful sunny Miami welcomed Star sailors to the first day of the 88th Bacardi Cup. One race is scheduled for each day of the 6-day event as part of the Bacardi Miami Sailing Week (BMSW) presented by EFG Bank. With winds around 10 knots from the East, the racing area was set about 1 ¾ miles south of Dinner Key Channel. The course is set at 95 degrees with two-mile legs, which will test sailors ... [more]  

Top international photographer, Chris Cameron is working out of the Volvo Ocean Race Village in Auckland. ... [more]  

NZ Rigging Supplied the Mast and Rigging package for Adrian Walters new Shaw 11 mtr 'Little Nico'. The mast is a High Modulus mast with internal locks on all halyards, internal mast jack, one piece Nomex cored box section boom, and composite rigging.cored box section boom, and composite rigging. ... [more]  

2015 Hobie 16 North American Championships September 20 to 25 at Pensacola Yacht Club. ... [more]  

Hobie Mid-Winter East - Ocean Springs Yacht Club April 10-12 2015. The regatta is open to all Hobie Cat classes ... [more]  

Choosing the northern route turned out to be a brilliant tactical decision. But not all decisions went so well. Because of one wrong gybe and changed weather patterns, Team Brunel lost its lead in less than a day. With only the Volvo Ocean Race tracker as a guide, it’s difficult for fans to understand how the Dutch team lost more than 80 nautical miles. Skipper Bouwe Bekking looks explains ... [more]  

RORC Caribbean 600 – Arguably the best fleet of offshore racing yachts that has ever gathered in the Caribbean, took part in the seventh edition of the event. 66 yachts started the 600 mile race around 11 Caribbean islands, with numerous world champions, America's Cup and Volvo Ocean Race sailors taking part with passionate Corinthian amateurs, many of whom are members of the Royal Ocean Racing Cl ... [more]  

This summer’s ‘must have’ tickets for The America’s Cup World Series, Portsmouth (ACWSUK) are officially available from Monday 2nd March. Fans and spectators are encouraged to book their place now to avoid disappointment with event organisers already receiving a large number of ticket and hospitality enquires. ... [more]  

SCYA's E.E. Manning Regatta 2015 – They had never sailed together until six months earlier when they stepped onto a boat that neither had ever sailed, but skipper Joseph Hou, 15, and crew Skylar Jacobsen, 14, squeezed out a remarkable victory Sunday in the Southern California Youth Yacht Racing Association's Shadden Series ... [more]  

Shawn Bennett of Tiburon, Calif. won the Long Beach Stop of the 2015 California Dreamin’ Series Sunday in this International Sailing Federation (ISAF) Grade three match racing regatta hosted by Long Beach Yacht Club and raced on the Long Beach Sailing Foundation’s fleet of Catalina 37s. ... [more]  

Sitting here in Antigua airport waiting for my flight back to London, life is good having just blasted across the Atlantic in just under nine and a half days on board the new Phaedo3 MOD 70, one of the fastest sailing boats 'in the world'... ... [more]  

In November of 1994 Yachting Magazine consultant Gary Jobson asked Peter Craig, 'how hard can it be? Just raise some flags and blow off some guns.' And so began Craig's involvement in what was then a 112 boat - single division regatta that would soon evolve into an iconic annual international keelboat event. Yachting Magazine founded Key West Race Week in 1987. ... [more]  

Serious Fun! That's what participants, sponsors and onlookers are expected to have during the 35th St. Maarten Heineken Regatta which will be held in St. Maarten during March 05 - 08, 2015. The Regatta is considered to be the biggest in the Caribbean and offers a great combination of challenging races and fantastic gatherings under the banner of 'Serious Fun'! ... [more]  

Barcelona World Race – After the limits of the southern oceans imposed by the combination of the weather systems and the safety barrier of the Antarctic Exclusion Zone, the Atlantic is opening up for the top trio. ... [more]  

Images from Auckland of the media conference on Sunday and prizegivings for Leg 4 ... [more]  

At the media conference held the morning after the finish of leg 4 of the Volvo Ocean Race, Mapfre skipper Xabi Fernandez announced that regular skipper Iker Martinez will be back on board for the next leg and most of the remainder of the race. Fernandez had taken over the role, skippering Mapfre to a 4th place on Leg 3 and a win on Leg 4. ... [more]  

Miami Sailing Week (BMSW) presented by EFG Bank will kick off with 173 boats traveling to Coconut Grove to compete in the 88th Bacardi Cup ... [more]  

Volvo Ocean Race: Leg 4 finishes at night after a tense day *Feature by Richard Gladwell, Sail-World.com NZL
The finish was more like that of a short 100nm race around the Hauraki Gulf. Instead, the first three boats to cross the finish line at the end of Leg 4 of the Volvo Ocean Race arrived mid-evening. ... [more]  

Farr 40 International Circuit - Alex Roepers doesn't like to dwell in the past. However, when prompted, the New York businessman will talk about the magical run he and the crew aboard Plenty enjoyed during the 2014 Farr 40 International Circuit. To the contrary, the thrill of victory only made Roepers and the Plenty team hungry for more. ... [more]  

Coast Guard crews continue the search Monday for Richard Byhre, the 76-year-old sailor who did not return from his sailing trip as expected. ... [more]  

The International Sonar Class is pleased to announce that Shumway Marine, with the cooperation of designer Bruce Kirby has made arrangements to have the Sonar built by Rondar Race Boats in the U.K., with plans eventually to have the boat built on both sides of the ocean. The American Rondar facility is in Peabody, MA. Rondar, expects to launch its first Sonar in April. ... [more]  

Rio de Janeiro's state environmental agency says it is investigating a fish die-off that has left thousands of carcasses floating in waters where sailing events are to be held when Brazil hosts next year's Olympics. ... [more]  

This year's 35th edition of the St. Maarten Heineken Regatta is nothing less than an island-wide effort. Besides the sponsors, countless volunteers and the numerous local organizations that offer their excellent services, the Regatta Organizers would like to say special thanks to the hotels which are so generous to donate complimentary hotel rooms for the St. Maarten Heineken Regatta. ... [more]  

Volvo Ocean Race: Images ashore after Leg 4 by Richard Gladwell, Sail-World.com NZL
Sail-World's NZ Editor, Richard Gladwell, was on the water and ashore for the finish of Leg 4 of the Volvo Ocean Race, and provided this gallery of images after the first three boats had docked. ... [more]  

Volvo Ocean Race: Images from the finish of Leg 4 by Richard Gladwell, Sail-World.com NZL
Sail-World's NZ Editor, Richard Gladwell, was on the water for the finish of Leg 4 of the Volvo Ocean race, and captured these images from the final few miles of the race, and on the dock. ... [more]  

O MAPFRE conquistou de maneira emocionante a quarta etapa da Volvo Ocean Race, disputada entre a China e a Nova Zelândia. Na manhã deste sábado (28), o barco espanhol cruzou a linha de chegada em primeiro após quase 21 dias de navegação. ... [more]  

RYA Suzuki Dinghy Show - a British tradition by Rob Kothe and Jedda Murphy
Our favourite boat show in the whole world is the RYA Suzuki Dinghy Show. It is like no other, with a large percentage of eight to 15-year olds, with many young siblings often dragging their parents down the aisles. Its a dull overcast day in Lonon with rain showers, but inside the heated halls of the Alexandra Palace, the fabled 'Ally Pally' , around 5,000 visitors will gaze at touch and feel ... [more]  

MAPFRE (Xabi Fernández/ESP) emerged victorious despite a pair of major setbacks in Leg 4 following one of the tightest-fought finishes in Volvo Ocean Race history on Saturday night. The victory gives the 2014-15 edition its fourth winner in four legs following successes for Abu Dhabi Ocean Racing (Ian Walker/GBR), Team Brunel (Bouwe Bekking/NED), and Dongfeng Race Team (Charles Caudrelier/FRA). ... [more]  

Mapfre took the gun, Abu Dhabi Ocean Racing was second and Dongfeng third. Photographer Ainhoa Sanchez was in the air over Auckland for 2014 – 2015 Volvo Ocean Race, and provided these images. ... [more]  

Photographer Ainhoa Sanchez was in the air as the fleet approached Auckland for the end of leg 4 for the 2014 – 2015 Volvo Ocean Race, and provided this gallery of images. ... [more]  

The wind has switched half turn and boats are now beating upwind to the finish, MAPFRE has held their lead and with the change in direction look quite safe. Team Alvimedica who was catching up at speed has slowed right up, caught in light winds behind Tiritiri Matangi island. With less than 10nm to go to finish and a fair 10kt wind holding, the slow patch looks to have been removed from equation ... [more]  

2015 RORC Caribbean 600 - Hap Fauth's American JV72, Bella Mente has been declared the overall winner. Whilst several yachts are still racing, by the morning of Friday 27th February none of the remaining teams had the ability to better Bella Mente's corrected time under IRC. It was third time lucky for Bella Mente as the Maxi 72 has finished second overall for the past two years. ... [more]  

Catch the live coverage of the Leg 4 Finish in Auckland. Check the video timer for a countdown to the start of coverage and the expected race finish time. Sail-World is updating the on the water action and weather - which has compressed the lead four boats ... [more]  

Barcelona World Race - Neutrogena crosses Cape Horn with 40 knots wind
St. Maarten Heineken Regatta - Natty Rico will close the final night
Barcelona World Race - At Cape Horn memories are made. and recalled
Big winds for SCYA Manning Regatta at ABY Club
Hutchinson and Roble honored at US Sailing’s Rolex Awards ceremony
Finn World Masters Championships 2015 - Pre registration open
Registration for the 2015 Finn European Championship is live!
RORC Caribbean 600, day 4 – Classic Focus and Four Figaro II teams
Hutchinson, Roble honored in New York as Best of 2014
Barcelona World Race - Pedestrian Pacific, Atlantic highway to home
America's Cup: Artemis Racing lines up against Oracle Team USA - Video
High Performance Yacht Design conference during Volvo OR stopover
Volvo Ocean Race: Ryan Houston - How Alvimedica's chemistry works *Feature
Volvo Ocean Race: Dave Swete - Alvimedica's race so far *Feature
Volvo Ocean Race 2015 – No sleep until Auckland
Etchells NA Midwinter East Series - Schoonmaker Cup preview
RORC Caribbean 600 day 4 – Close competition – 43 yachts still racing
Volvo Ocean Race: Team Alvimedica hopes to use Coastal Classic tricks *Feature
AC45 Turbo Training - Oracle Team USA images by pressure-drop + Video
America's Cup: Emirates Team New Zealand gears up on less money *Feature
Volvo Ocean Race – The race tightens as New Zealand looms   
AWT Goya Pro Cabo Verde kicks off in style!   
Barcelona World Race - Two different worlds separated by Cape Horn   
America's Cup: Barker offered non-sailing role by Emirates team NZ   
2015 CYC Midwinters Race – Pictures by pressure-drop.us   
CYC Midwinters Racing – Bring On The Breeze! – Overall   
Laser World Championship – Over 2000 sailors to race in Kingston   
Volvo Ocean Race: Barkow and Lush - from the Olympics to the Volvo *Feature   
Volvo Ocean Race 2015 – Its anyone's race - Leg 4 to Auckland   
Barcelona World Race - A time for extra care and caution   
2015 RORC Caribbean 600 - Phaedo3 breaks record   
Barcelona World Race - Cheminées Poujoulat pass Cape Horn   
2015 RORC Caribbean 600 - Records predicted to tumble + Video   
2015 ISAF Women’s Match Racing World Championship - NOR released   
Asher Otto and Itchy Feet to open up the Caribbean Jam night   
RS Sailing and BIC Sport North America team up for sailing programs   
RORC Caribbean 600 – Record pace on Day 2   
Port of Los Angeles Harbor Cup - About to begin   
10 tips from BoatUS for owners and renters   
Aquece Rio International Sailing Regatta – Notice of Race online   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News





Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png http://www.sail-world.com/event_images/image/FaceBook-icon.png  http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL NEW US
LocalAds   DE  ES  FR  IT