sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery
Sail-World.com : Audi Hamilton Island Race Week Day 5 - Weather forecast
Audi Hamilton Island Race Week Day 5 - Weather forecast


'surface chart 23rd August - Audi Hamilton Island Race Week 2013'   

Audi Hamilton Island Race Week Day 5 - Weather forecast issued by Kenn Batt at 0615hr for Friday 23rd August 2013.

Nil Warnings current.

Synoptic Discussion:
A weak ridge of high pressure persists over the race area.

Observations:
At 0600hr the surface wind at Hamilton Island was 160 deg at 7kn, gusting 9kn (temp 18C, pressure 1018hPa). At Hardy Reef (further offshore at 19.7S 149.2E) the wind was 110deg at 07kn.

Forecast Winds for Surprise Rock (to E of Hamilton Island) (Read Discussion below)

0800:MD150 DR(170-130) MS08 SR05-12kn
1000:MD130 DR(150-110) MS10 SR06-14kn
1200:MD110 DR(130-090) MS11 SR07-15kn
1400:MD100 DR(120-080) MS12 SR08-16kn
1600:MD090 DR(110-070) MS14 SR09-17kn
1800:MD080 DR(100-060) MS12 SR08-15kn

Key: First column is mean wind direction in deg Magnetic (MD). It is the 10min average (mean) value at a height of 10m above the water leading up to the hour quoted. The second column is the directional range (DR) of the wind direction in deg Mag. This takes into account the natural oscillation of the wind and is a function of the atmospheric stability, etc. The third column is the mean speed (MS) in knots (kn) and is the average 10min value leading up to the hour quoted at a height of 10m above the water. The last column is the wind speed range (SR) in knots and is the lowest wind speed to highest wind speed in the 10min leading up to forecast hour.

Forecast chart for 4pm 23rd August - Audi Hamilton Island Race Week 2013 -    

Discussion
All the computer models that count are in good agreement.

The gradient wind is expected to change from about 160deg at 10kn this morning to lighter and more variable this afternoon. As such the surface wind is expected to commence from 150deg and trend left during the day under the influence of the sea breeze component.

The difficult questions are still however:
1. How far left? The weak sea breeze component should assist the left trend. For your racing period a max left of 060deg is possible.
2. How quickly will the direction trend left? I’m happy with forecast above however there is a 65% chance that the direction shifts more slowly than above.
3. How strong the winds? Pretty happy with the wind ranges above, however there is a 85% chance that the wind speeds could be about 2kn stronger from mid-afternoon? The sea breeze component will again assist here.

Wind direction and speed is expected to be more variable than forecast above over parts of the race course (especially within the general Whitsunday Passage area) due to changing topographical profiles i.e. wind speed enhancement (+2 to 5kn) due to funneling out of bays, some speed enhancement and wind directional changes around headlands and in passages. Lighter and more variable winds in the lee of islands, etc

Natural wind direction oscillations: around 20 to 30 deg, more/less due to topographical influences.

Weather
Dry and sunny.
Maximum land temperature at Hamilton Island: 23 degrees. Proserpine: 26deg
Sea Temperature: about 22 degrees.

Wind Waves:
0.2 to 0.6 metres.
Heights less in lee of land and more when wind wave opposes tidal current.
(Wave heights quoted are Significant wave heights).

Tidal Current: A strong flood first up this morning followed by slack water and then a strong ebb developing this afternoon.

Be extremely careful in narrow channels, etc.

Remember: In general tidal currents flood to the south and ebb to the north in the Whitsundays. There are many localized variations however so be very vigilant.

Tide at Shute Harbour:
Low 0.38m at 0601hr, High of 3.10m at 1211hr, and Low 0.52m at 1802hr. (know your time offsets for other locations around the race courses)

Outlook
Saturday: Light and variable at first becoming SE to E at 8 to 14 kn (ave) during the late morning and afternoon. Dry and sunny.


by Kenn Batt

  

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

http://www.sail-world.com/index.cfm?nid=113533

9:24 PM Thu 22 Aug 2013GMT


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

Click for further information on
2013 Audi Hamilton Island Race Week 2013

Related News Stories:

23 Aug 2013  Audi Hamilton Island Race Week - Full results for day 4
23 Aug 2013  Hamilton Island Race Week - Latecomer stuns in non-spinnaker div 1
22 Aug 2013  Morning lottery leads into magic at Audi Hamilton Island Race Week
22 Aug 2013  Audi Hamilton Island Race Week - No stopping Nessie
22 Aug 2013  Audi Hamilton Island Race Week - Holy Cow, the whales are back !
22 Aug 2013  Audi Hamilton Island Race Week - Lay day cartoon series
22 Aug 2013  Audi Hamilton Island Race Week - Cartoon series by Mark O’Brien
21 Aug 2013  Audi Hamilton Island Race Week - Cartoon series by Mark O’Brien
21 Aug 2013  Audi Hamilton Island Race Week - Full results for day 3
21 Aug 2013  Audi Hamilton Island Race Week - Day 3 images by Andrea Francolini
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




Extreme Sailing Series - Kiwis clinch Act win in Istanbul + Video
2014 Rolex Big Boat Series - Two long races today for the J70 fleet
2014 Rolex Big Boat Series - Impressive to sail out of the Golden Gate
Extreme Sailing Series - Istanbul delivers four days of great racing
Extreme Sailing Series: Emirates Team NZ bounces back for series win
Santander 2014 ISAF Worlds - Light winds and current test six classes
ISAF Sailing World Championships - Solid Day 3 for US Sailing Team
ISAF Sailing World Championships - Day 3 images by Jesus Renedo
Marseille One Design 2014 - GC32 Armin Strom blitzes final day
Volvo Ocean Race 2014-15 - Una Etapa 0 complicada para todos
Santander 49ers: Olympic Gold Medallist says two into 90 does not go!! *Feature
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   


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