Please select your home edition
Edition
T Clewring - Generic

Louis Vuitton Cup- Predictwind - It's all in the building breeze again

by Richard Gladwell on 23 Aug 2013
Louis Vuitton Cup Final - Luna Rossa Challenge © Luna Rossa/Studio Borlenghi/Borlenghi-Butto

Predictwind indicates that winds will follow a typical San Francisco pattern but should be inside the limit for the start of racing at 1.10pm on Friday for Day 5 of racing in the Finals for the Louis Vuitton Cup between Italian Challenger Luna Rossa, and Emirates Team New Zealand.

With the racing back to it regular start time of 1310hrs the two feeds produced by Predictwind indicate that winds will be averaging 16-18kts, and will be gusting higher.

The key to the day is whether the wind will build at the rate the forecast indicates.

The top image shows the wind speed and direction at 1300hrs with one feed showing winds of 16kts while the other is at 18kts - these are only average speeds and gusts will be higher. 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 the breeze kicking in early at around 10kts and staying on a plateau until just before 11.00am, if that plateau is extended for a variety of reasons, then racing will take place in more moderate winds, with the increase coming later in the day. Peak breeze is expected just after 3.00pm at 23kts.

The first image shows the wind prognosis for the scheduled start of the second race, when one feed expected the wind to increase more quickly, while the other is a little more gradual. Peak windstrength later in the afternoon is 23kts - agreed by both Predictwind models.


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


The next two images are showing the same style of information except for an hour later around the time of the second race for the day. Winds are creeping very close to the limit, and bearing in mind that these are only average windspeeds with no accounting for gusts, it is likely that the wind limit will be exceeded on the current wind information.



The fifth chart shows the wind expectations for the following day, Thursday, which shows a reduction in the strength of the breeze, allowing officials some scope to catch-up if required.


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), www.predictwind.com!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 www.predictwind.com!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 www.predictwind.com!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.

Newport Boat Show 2016 660x82Bakewell-White Yacht DesignT Clewring J-class

Related Articles

PredictWind - Stunning new forecast maps
When developing the Offshore App, we had to rethink maps for offshore sailors. When developing the Offshore App, we had to rethink maps for offshore sailors. The mapping technology was rebuilt to be faster, have smaller downloads and be able to smoothly animate PredictWind’s advanced forecasts. Following the success of the Offshore App, we’re releasing this unique display technology across all other platforms, including the forecast website, Android and iOS Apps
Posted on 24 Jun
Predictwind's Offshore App supports Redport Optimiser - get a deal now
Predictwind have negotiated a 20% discount on the Optimizer and XGate for all PredictWind customers. Predictwind's Offshore App now supports the RedPort Optimizer. For the next seven days Predictwind have negotiated a 20% discount on the Optimizer and XGate for all PredictWind customers.
Posted on 10 Apr
PredictWind Offshore App integrated with Redport Optimizer and XGate
PredictWind has just released the latest version of their Award winning Offshore app PredictWind, the world leader in weather forecasting, has just released the latest version of their Award winning Offshore app, which now allows a direct connection with the Redport Optimizer and XGate suite of satellite data services.
Posted on 10 Apr
Predictwind - A Christmas present for the Sydney Hobart - Updated
Latest from Predictwind (0900hrs on Christmas morning) is that the front should be reduced in duration Latest for the weather trolls from Predictwind (0900hrs on Christmas morning) is that the front should be reduced in duration from about 2300hrs on Dec 26 and will be through about 0900 on Dec 28, and will peak at 31kts average but mostly in the 27kt average.
Posted on 25 Dec 2015
Team SCA and Vestas Wind cross the fleet on Leg 8 - Volvo Ocean race
Team SCA has crossed ahead of the chasing fleet at the latest sked at 0030hrs UTC on June 10. Team SCA has crossed ahead of the chasing fleet at the latest sked at 0030hrs UTC on June 10. According to the Predictwind routing, showing the optimum route to finish, the womens crew have about 20 hours to sail to the finish in Lorient, assuming race organizers do not extend the course.
Posted on 10 Jun 2015
Team SCA holds reduced lead after Coast of Death in Volvo Ocean Race
The womens crew of Team SCA have held their lead as the fleet sails across the Bay of Biscay in winds of 28kts. The womens crew of Team SCA have held their lead as the fleet sails across the Bay of Biscay in winds of 28kts. The westerly group of the fleet have now tacked onto port with Team SCA leading Vestas Wind followed by Team Alvimedica and Dong Feng at the 1843UTC Sked on June 9, 2015.
Posted on 10 Jun 2015
Team SCA looks to score massive upset in the Volvo Ocean Race
The womens crew of Team SCA are just 36 hours from scoring a massive upset in the Volvo Ocean Race The womens crew of Team SCA are just 36 hours from scoring a massive upset in the Volvo Ocean Race, and turning in perhaps the most significant result in the history of womens involvement in sailing. At the 0640UTC position report, the two boats with the least to lose on the leaderboard, Team SCA and the resurrected Team Vestas Wind are first and second on the water as the fleet enter Biscay
Posted on 9 Jun 2015
Team SCA takes coastal route to pick up big lead in Volvo Ocean Race
The inshore and offshore groups have closed together on Leg 8 of the Volvo Ocean Race. The inshore and offshore groups have closed together on Leg 8 of the Volvo Ocean race. At the 0944UTC sked on June 8, 2015, the girls crew aboard Team SCA had earned a lead of over 5nm, based on the time to reach a point just in the Bay of Biscay.
Posted on 8 Jun 2015
Volvo Ocean Race fleet splits ahead of Bay of Biscay gale
The Volvo OR fleet has split into two groups ahead of gale force winds expected to hit on the morning of June 9 UTC. The seven boat Volvo Ocean Race fleet has split into two groups ahead of gale force winds expected to hit on the morning of Jun 9 UTC. An inshore group led by Team Vestas Wind will be first to hit the winds expected to average 30kts, but likely to be gusting close to 40kts.
Posted on 8 Jun 2015
Volvo Ocean Race- Wislang expected to lead Kiwis home after fast ride
Abu Dhabi's Daryl Wislang looks like being the first in the queue at the piecart, when the boats arrive on Saturday Latest predictions for the finish of Leg 4 of the Volvo Ocean Race are all indicating a finish time between 1000hrs and 1400hrs on Saturday February 28. For one of only three Kiwi crew members in the Volvo Ocean Race, Abu Dhabi's Daryl Wislang looks like being the first in the queue at the piecart, when the boats reach Auckland.
Posted on 24 Feb 2015