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© Crown copyright 2009
Weymouth Weather Brief: 6th August 2012
Gillean Keith
© Crown copyright 2009
Headlines for Monday
• Gradient Wind WSW (260) 15-20 KT
• Surface winds SW (230-260) 12 G 15 KT increasing to 15 G 20 KT
• Variability in SW direction starting 250, backing 20 degrees to 230 by 1400 L then veering again around 1500 L.
• Sea State smooth (0.4-0.5 M on west course)
• Sunny day
© Crown copyright 2009
Synoptic Situation
Analysis Monday 0100 L Forecast Monday 1300 L
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Current Weather Situation
RADAR & visual satellite picture 0700 L
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Model products Winds forecast loop (knots)
1000 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1030 Monday
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Model products Winds forecast loop (knots)
1100 Monday
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Model products Winds forecast loop (knots)
1130 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1200 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1230 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1300 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1330 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1400 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1430 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1500 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1530 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1600 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1630 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1700 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1730 Monday
© Crown copyright 2009
Model products Winds forecast loop (knots)
1800 Monday
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Winds - Uncertainty in wind prediction From convective scale ensembles
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Model products Wave forecast (metres)
1400 Monday
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Weymouth Bay Nothe - Wind Forecast
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Wind Direction & Delta Wind Speed Wind Gusts
© Crown copyright 2009
Portland Harbour - Wind Forecast
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08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00
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Wind Direction & Delta Wind Speed Wind Gusts
© Crown copyright 2009
Weymouth Bay West - Wind Forecast
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Wind Direction & Delta Wind Speed Wind Gusts
© Crown copyright 2009
Warnings Board
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Tuesday’s Weather
Forecast Tuesday 1300 Gradient Wind forecast Tuesday 1300
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Summary and uncertainties
• Surface winds SW (230-260) 12 G 15 KT increasing to 15 G 20 KT
• Variability in direction, backing then veering later.
• Tuesday – Warm front approaching, SSW 10-12 KT becoming SW 12-15 KT. Light rain, drizzle, low cloud.
• Wednesday – Light/very light gradient wind and low cloud, poor visibility.
• Thursday – light easterly gradient wind, good sea breeze signal.
© Crown copyright 2009
Questions & answers
© Crown copyright 2009
Forecast products
• http://www.metoffice.gov.uk/loutdoor/olympics/event-manager/(General Weather Forecast, Race Areas Forecasts, Hourly Updates)
• This powerpoint brief is only available via the ISAF website.www.sailing.org/olympics/london2012