sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery
Sail-World.com : America's Cup: Predictwind - Fresher breeze for Day 2
America's Cup: Predictwind - Fresher breeze for Day 2


'The America’s Cup Race Course, framed by the Golden Gate Bridge'    Richard Gladwell ©    Click Here to view large photo

Predictwind indicates that stronger winds will prevail for Sunday, the second race day for the 2013 America's Cup. The first race starts at 1.15pm on Sunday, local time with the second race scheduled for 1415hrs. The 18fters racing in the International Series will have stronger breezes when they start racing around 1530hrs, or later, depending on launching.

With the racing at its regular start time of 1315hrs the two feeds produced by Predictwind indicate that winds will be averaging around 15 kts, with the breeze having been light for for the early morning. The key point is that on the graph image the two weather feeds produced by Predictwind are very close together suggesting the the certainty of the prognosis is high. As yesterday the the key point in the forecast is that the breeze builds very sharply and if that increase in strength is delayed then races could be sailed in lighter winds. Fog shrouded San Francisco all night an only really lifted about 0900hrs which could have some impact on the rate of increase of the breeze if inland from San Francisco the landmass was cooler than expected.

Wind map for September 8, 2013 San Francisco at 1315hrs - Start of Race 4 -  PredictWind.com   Click Here to view large photo

The top image shows the wind speed and direction at 1300hrs with breezes expected to be 15kts at the start of Race 1 - these are only average speeds and gusts will be higher, but not enough to exceed the wind limit. There is a little variation in the forecast indicating a higher degree of certainty as to the outcome.

The key feature of the forecast is close agreement between the two feeds as to the rate of build of the breeze, and around race start they are consistent in their projection.

Wind graph for September 8, 2013 San Francisco at 1315hrs - Start of Race 3 -  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. If the breeze builds later than predicted, then the light winds soon one the left of the graph will extend through to the race start time.

Wind graph for September 8, 2013 San Francisco at 1415hrs - Start of Race 4 -  PredictWind.com   Click Here to view large photo

The top image shows the wind speed and direction at 1400hrs with breezes expected to rise to 18kts at the start of Race 2 - these are only average speeds and gusts will be higher, but not enough to exceed the wind limit of 23kts.

The key feature of the forecast is agreement between the two feeds as to the rate of build of the breeze, and again around race start they are consistent in their projection.

Wind graph for September 8, 2013 San Francisco at 1415hrs - Start of Race 3 -  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. If the breeze builds later than predicted, then the wind will be slightly lighter.

The third chart (below) shows the wind expectations for Sunday and Monday. 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 8, 2013 San Francisco Sunday - Monday -  PredictWind.com   Click Here to view large photo

The image below shows the wind speed and direction at 1500hrs for the 18fters with breezes expected to be peaking around 20kts at around 1600hrs, as yesterday - these are only average speeds and gusts will be higher, when combined with the tide conditions yesterday were right on the limit for sailing. There is a little variation in the forecast indicating a higher degree of certainty as to the outcome.

Wind map for September 8, 2013 San Francisco at 1500hrs - Start of 18fters -  PredictWind.com   Click Here to view large photo

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 strength of the ebbing tide and standing waves can be seen in this buoy just to seaward of the Golden Gate Bridge.  Richard Gladwell_©   Click Here to view large photo

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 image 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=114204

5:48 PM Sun 8 Sep 2013GMT


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


Related News Stories:

08 Sep 2013  America's Cup: Predictwind - Lighter winds and late build on Day 1
06 Sep 2013  America's Cup: Predictwind - Lighter winds and late build for Day 1
24 Aug 2013  Louis Vuitton Cup: Predictwind - Winds expected to be over the limit
23 Aug 2013  Louis Vuitton Cup: Predictwind - It's all in the building breeze again
19 Aug 2013  Louis Vuitton Cup: Predictwind - Strong winds despite changed start
18 Aug 2013  Louis Vuitton Cup: Predictwind - Lower breeze for second day of Finals
18 Aug 2013  Louis Vuitton Cup: Top breeze predicted for first day of Finals
21 Jul 2013  America's Cup: Big breeze predicted for Luna Rossa vs Emirates Team NZ
13 Jul 2013  America's Cup: Predictions for Luna Rossa versus Emirates Team NZ
02 Jul 2013  Final bulletin on schooner Nina plus Predictwind forecasts for Tasman
MORE STORIES ...




News - USA and the World

America's Cup: Challenger calls Competitor Meeting ahead of deadline *Feature by Richard Gladwell Sail-World.com/nz,


































































Formula Windsurfing Youth and Master Worlds overall
49er and 49erFX Europeans: Pitfalls aplenty on day 1 + Video
ISAF Youth Worlds - Laser Radial sailors look to join list of legends
Coville soon to chase solo circumnavigation record in giant trimaran
Fierce competition at the Meanline Fins Slalom Challenge
Volvo Ocean Race - Team Brunel opt for experienced winner
Bakewell-White supermaxi designed to take Transpac's Barn Door Trophy *Feature
Crew rescued by navy patrol from J/111 racer after Mayday in storm
Team Alvimedica practice in Newport, RI - Photos
18 foot skiff European Championship (Open Europeans) - Final results
Nacra 17 European Championships - No action on day 1
ISAF Youth Worlds - 29er and SL16 sailors prepare for battle + Video
Volvo Ocean Race: Eight new crew members named by teams
Volvo Ocean Race: New additions to Spanish team announced
2014 Cape Panwa Hotel Phuket Raceweek - Phuket Island is ready to host
PWA Awaza World Cup - Cyril Moussilmani and Delphine Cousin on top
Foiling Week - Moth Class Italian Open Championship Day 2
America's Cup: Luna Rossa foiling in AC45s at their Italian base
Star World Championship - Germans claim dramatic win in Malcesine
PWA Awaza World Cup - Down to the wire in Turkmenistan
Route Halifax Saint-Pierre - Off to France!   
Nacra 17 Europeans - La Grande Motte back in Olympic classes arena   
Stena Match Cup Sweden - Hansen hat trick in Marstrand + Video   
Route Halifax Saint-Pierre Race keeps an eye on Arthur   
World Match Racing Tour: See the Finals replay at the Stena Match Cup   
Newport International Boat Show unveils exciting 'At The Helm' Program   
Stena Match Cup Sweden - First blood to Hansen over Canfield + Video   
Star World Championship - Americans claim race win in Malcesine   
PWA Awaza World Cup - Weather halts action on day 4   
Clipper Race - Henri Lloyd wins OneDLL Cup into Den Helder   
Clipper Race - Close match racing in closing stages of the OneDLL Cup   
Volvo Ocean Race: Spanish play catch-up with under 100 days to go   
World Match Racing Tour: Catch the live action at the Stena Match Cup   
Finn Junior Worlds - Battle for the Jorge Bruder Silver Cup   
Mobiles drive traffic - 72% increase in Sail-World.com page view *Feature   
British Open Dragon Championship finale at Royal Lymington preview   
2014 Cape Panwa Hotel Phuket Raceweek - Phuket is ready to host   
PWA Awaza World Cup - Valerie Ghibaudo hits back on day 3   
Star World Championship - Hard fought win on day 4 + Video   
Stena Match Cup Sweden - Action-packed match racing + Video   


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