© Crown copyright 2009 Weather Situation Satellite, RADAR, Model Products.

© Crown copyright 2009

Weather SituationSatellite, RADAR, Model Products


Weymouth Weather Brief: Thu 6 Sept

Penny Tranter


Headlines for today

• Large area of high pressure centred close to WAP

• Light SE’ly (130°) gradient wind veering/turning right through the day becoming SSE’ly (160°) by midday and S (175°) by mid afternoon

• Light mainly SSE surface wind (150°) 5kt or less setting in by mid morning

• Light and fitful sea breeze WSW (235-250°) 6kt or less trying to build in from late morning and move east across Portland Harbour during afternoon

• 10% chance light sea breeze blowing for at least 2 hours between 5-8kt

• Fine – dry, warm with sunny spells


Synoptic Situation

Analysis Thursday 06/0100 Forecast Thursday 06/1300


Satellite picture 0715 today

WAP


Model products Winds forecast loop (knots)

0900 Thursday


0930 Thursday




1000 Thursday



1030 Thursday



1100 Thursday



1130 Thursday



1200 Thursday



1230 Thursday



1300 Thursday



1330 Thursday



1400 Thursday



1430 Thursday



1500 Thursday



1530 Thursday



1600 Thursday



1630 Thursday



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1730 Thursday



1800 Thursday


Winds - Uncertainty in wind prediction From convective scale ensembles


Portland Harbour - Wind Forecast

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Time (local)

Win

d D

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d S

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Wind Direction & Delta Wind Speed Wind Gusts


Warnings Board


Summary and uncertainties

• Light mainly SSE surface wind (150°) 5kt or less setting in by mid morning

• Light and fitful sea breeze WSW (235-250°) 6kt or less trying to build in from late morning and move east across Portland Harbour during afternoon

• 10% chance light sea breeze blowing for at least 2 hours between 5-8kt


Questions & answers


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

© Crown copyright 2009 Weather Situation Satellite, RADAR, Model Products.

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