sail-world.com -- Audi Hamilton Island Race Week - Daily weather forecast
Audi Hamilton Island Race Week - Daily weather forecast
Sat, 24 Aug 2013
Audi Hamilton Island Race Week - Daily Weather Forecast issued by Kenn Batt at 0615hr for Saturday 24th August 2013.
Nil Warnings current.
A weak ridge of high pressure persists over the race area.
Observations: At 0600hr the surface wind at Hamilton Island was 240 deg at 3kn, gusting 4kn (temp 18C, pressure 1020hPa). At Hardy Reef (further offshore at 19.7S 149.2E) the wind was 110deg at 4kn.
Forecast Winds for Surprise Rock (to E of Hamilton Island) (Read Discussion below)
0800:MD160 DR(180-140) MS05 SR00-08kn could be light and variable? 1000:MD140 DR(160-120) MS06 SR01-09kn could be light and variable? 1200:MD120 DR(140-100) MS07 SR03-10kn 1400:MD100 DR(120-080) MS09 SR05-13kn 1600:MD090 DR(110-070) MS10 SR06-14kn 1800:MD070 DR(100-060) MS11 SR07-15kn
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.
Discussion All the computer models that count are in pretty good agreement. i.e light!! The forecast gradient wind is expected to be 120deg at 5-10kn. The surface wind today is expected to commence as a light land breeze (230-210deg) shifting to 160-140deg and then trending left during the day under the influence of a weak sea breeze component.
The following questions still continue to plague us: 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 60% chance that a weak sea breeze develops via a 'glassout' . This situation would see from about 1200-1300hr an 080-040deg at 4-09kn develop? 3. How strong the winds? Pretty happy with the wind ranges above. There is a 70% chance that speeds are about 2kn stronger from about 1400hr?
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 40 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: 0.1 to 0.4 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 0.50m at 0642hr, High of 3.01m at 1257hr, and Low 0.80m at 1850hr.
(know your time offsets for other locations around the race courses)
Onesails.com - Workforce
OneSails is the culmination of over 35 years of experience accumulated by our team in design and technology applied to sail-making. [More info]
Burke Marine, suppliers of international quality marine clothing and equipment, was founded by Martin Burke on the shores of Sydney Harbour in 1971. Visit our website for your nearest stockist. [More info]
Ensign Ship Brokers
Ensign Ship Brokers was established in 1980 and has spent the last 28 years expanding our marine knowledge and developing our reputation! We strive to provide the very best service! [More info]
Festival of Sails
The Festival of Sails is the largest annual keel boat regatta in the Southern Hemisphere with over 400 yachts and 4300 competitors annually taking part in the event. [More info]
GME Standard Communications Pty Ltd
Leaders in communications and navigation. Their goal has always been to make products whose innovation, convenience and peace of mind can help improve the lives of their customers. [More info]
Henri Lloyd was established in 1963 in Manchester, England. Mr Henri, as he became universally known, founded the company based upon hard earned principles of honesty, integrity and freedom. [More info]
Hood Sailmakers (Aust) P/L is 100% Australian owned and operated. The first sail loft outside of the USA to be granted a franchise in 1968 by the founder Ted Hood. [More info]
Mauri Pro Sailing
Your direct access to sailing solutions. 8,000+ products for cruising and racing sailors and sailboats. We search for appropriate sailboat hardware or sailing gear and offer them at competitive prices [More info]
Navionics is proud of its superb cartographic database comprising more than 25,000 charts and port plans; the largest privately owned database of its kind, the only one using full seamless technology [More info]
Performance Sailcraft Australia (Asia Pacific)
Laser builder Performance Sailcraft Australia has taken on the successful RS Sailboat range from Britain, and is now licensed to build and distribute all of the RS range in the Asia Pacific region. [More info]
Quantum Australasia Pty Ltd
Quantum Sail Design Group designs, engineers and manufactures sails for racers and cruisers who demand the highest levels of quality and performance. [More info]
Sanctuary Cove International Boat Show
The Sanctuary Cove International Boat Show (SCIBS) is an annual four-day event which attracts buyers and marine industry representatives from across Australia and around the globe. [More info]
Sydney Rigging Specialists
Sydney Rigging Specialists is a leading company in the supply of yacht rigging, cordage, marine fittings and accessories. We are based in Sydney and work from our specially fitted out rigging shop. [More info]
Ullman Sails Australia
The Ullman Sails Australia team provides service to customers all over Australia with four main locations in Brisbane, Perth, Sydney and the Whitsundays. [More info]