Blow me down

The Sunday Telegraph (Sydney) - - HOT TOPIC -

The high­est re­cently recorded wind speed from the north­east is 76 km/h at Syd­ney Air­port on 4/6/2016. An ex­tremely strong sea breeze can push over 100km in­land. Sailors’ ob­ser­va­tions sug­gests the nor-easter seabreeze off Syd­ney can ex­tend up to 60km out to sea.

Most seabreezes slow down dur­ing the evening and stop be­fore mid­night,

When a seabreeze first be­gins it blows di­rectly from sea to­wards land, how­ever due to the Co­ri­o­lis Force – ba­si­cally the spin­ning of the Earth – the wind moves counter-clock­wise as it strength­ens, so in Syd­ney it’s a nor-easter (for the same rea­son Perth’s ‘Fre­man­tle Doc­tor’ sea breeze is a sou-wester).

Sev­eral days of strong north-east winds can drive blue bot­tles onto NSW beaches. But, be­cause their floats project ei­ther to the left or to the right; af­fect­ing which way they will “sail” in the wind, not all blue­bot­tles in a colony will be pushed ashore.

Per­sis­tent north-east can also lead to up­wellings of very cold wa­ter on Syd­ney’s beaches as the warmer sur­face wa­ter is pushed aside.

Sea breezes are gen­er­ally stronger dur­ing late spring and early sum­mer when the dif­fer­ence be­tween land and sea tem­per­a­ture is at its great­est.

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