sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery
Sail-World.com : America's Cup: Predictwind - Lighter winds and late build for Day 1
America's Cup: Predictwind - Lighter winds and late build for Day 1


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

Predictwind indicates that light to moderate winds will prevail for Sunday, the first race day for the 2013 America's Cup. The first race starts at 1.15pm on Saturday, 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.

With the racing at its regular start time of 1315hrs the two feeds produced by Predictwind indicate that winds will be averaging around 10-15kts, however 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 winds of 10kts.

Wind map for September 7, 2013 San Francisco at 1300hrs - Race 1 -  PredictWind.com   Click Here to view large photo

The top image shows the wind speed and direction at 1300hrs with breezes expected to be only 10-12 kts 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 disagreement between the two feeds as to the rate of build of the breeze, but around race start they are consistent in their projection.

Wind graph for September 7, 2013 San Francisco at 1315hrs - Race 1 -  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 map for September 7, 2013 San Francisco at 14000hrs - Race 2 -  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 15-18kts at the start of Race 2 - these are only average speeds and gusts will be higher, but not enough to exceed the wind limit.

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

Wind graph for September 7, 2013 San Francisco at 1415hrs - Race 2 -  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.

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

Wind predictions September 7 and 8, 2013 San Francisco at 1300hrs - Race 1 -  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 - 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.

Wind map for September 7, 2013 San Francisco at 1500hrs - 18fters - Race 1 -  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 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=113624

12:23 PM Fri 6 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
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
06 Jun 2013  Auckland Fiji Race: First racing monohull finishes in Fiji
MORE STORIES ...




News - USA and the World





A complete recap of the most successful Melges 20 World Championship by International Audi Melges 20 Class Association,












ISAF Santander - Upwards path for Austrian women's 470 crew + video by Luissa Smith, International 470 Class Association,
























2014 Rolex Big Boat Series - Farr 40 Day 4 by William Wagner, San Francisco


























GBR aiming for first ever Nacra 17 Games berth at Santander Worlds
Volvo Ocean Race: Man and sail overboard as Leg 0 serves up drama
ISAF Sailing World Championships Santander 2014 – Images by Dan Ibsen
Santander Worlds – already a spectator success
ISAF Sailing World Championships Santander 2014 - Day 3 morning report
Volvo Ocean Race 2014-15 - Tales from the extreme
Volvo Ocean Race: Latest starter wins opening race
2014 J/70 World Championship - Healy, Abdullah, Becker and Borges win
2014 Rolex Big Boat Series - Full-blown, once again
ISAF Worlds - Americans jump up Laser and Laser Radial leaderboard
2014 Rolex Big Boat Series - Farr 40 Day 3
America's Cup: Luna Rossa sailing with two foiling AC45's + Video
Extreme Sailing: Emirates Team NZ retain second overall
ISAF Sailing Worlds, Santander - Rio Olympic Laser spots snapped up
Rolex Swan Cup - All set for final showdown
Upper Midwest sailors need help to take it to the next level
ISAF Sailing World Championships - RS:X action begins in Santander
ISAF Sailing Worlds, Santander - Americans rise in Laser and Radial
Extreme Sailing Series - A remarkable penultimate day’s racing + Video
Marseille One Design - GC32 GDF Suez unstoppable in the light
Rolex Swan Cup - Day 3 images by Carlo Borlenghi   
ISAF Sailing World Championships - Images of the leaders in Santander   
Rolex Big Boat Series - Good day for Double Trouble   
Rolex Big Boat Series - Day 2 images by Erik Simonson   
Royal Cup Marina Ibiza - TP52 fleet ready for tricky race tracks   
Rolex Big Boat Series - Plenty maintains lead   
2014 Asia Pacific Student Cup - Count down begins   
Extreme Sailing Series: Live coverage of Day 3 - view here   
Volvo Ocean Race 2014-15 - Going away   
Volvo Ocean Race 2014-15 - Practice makes perfect   
2014 J/70 World Championship - Contrasting conditions on Day 4   
Rolex Big Boat Series - 50 years of big boat racing: a retrospective   
2014 Rolex Big Boat Series - Day 2   
Snipe Western Hemisphere and Orient Champ: Rios takes the Championship   
Volvo Ocean Race: Leg Zero signals start of the significant racing   
Extreme Sailing Series: Physically demanding racing for BAR on Day 2   
Emirates Team NZ: Holding second overall after Day 2 in Istanbul   
Extreme Sailing Series: A force to be reckoned with in Istanbul +Video   
ISAF Sailing Worlds - Day 1 images by Jesus Renedo and Pedro Martinez   
Marseille One Design: GC32's Armin Strom storms ahead on day 2 + 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