The Fremantle Doctor often cools the Perth suburbs by several degrees, whilst nearer the coast the wind can be quite strong, often blowing between 15 and 20 knots and making afternoon beach visits unpleasant. Other months have a weak or non-existent Fremantle Doctor. This occasionally occurs in Sydney you can look offshore and see the smog out to sea , but is quite common in heavily industrialised cities such as Los Angeles and Athens.
The Fremantle Doctor often cools the Perth suburbs by several degrees, whilst nearer the coast the wind can be quite strong, often blowing between 15 and 20 knots and making afternoon beach visits unpleasant. It is nearly always affected by the dominant synoptic pattern, which can result in 'strange' behaviour. A wind rose showing the different wind directions for Perth can be found at the Bureau of Meteorology's website. Later when it is at maximum strength, the direction is usually from the southwest or south-south-west. Though October and November are not as warm, the ocean temperature is cooler resulting in the sea breeze in these months. That combined with what would have been a shallow sea breeze under the synoptic pattern and a shallow inversion would have convectively mixed warm air through the surface layer. In Perth , the capital city of Western Australia, the wind is named the Fremantle Doctor because it appears to come from the nearby coastal city of Fremantle , and it brings welcome relief from the summertime high temperatures. I doubt that the urban heat island would have much effect it is more well known for it's effects on minima than maxima. General trend[ edit ] During summer months, the Fremantle Doctor consistently blows from the southwest along the southern half of the west coast, starting between noon and 3 pm. This means that the sea breeze sneaks down the harbour, but the temperature continues to rise in the westerly at Obs Hill. I suspect that the sea breeze developed, but didn't extend far offshore. Further analysis[ edit ] The Fremantle Doctor is strongest in December and January, when the temperature differential between the land and ocean is greatest. This change in wind direction is due to the Coriolis Effect [ citation needed ]. Other factors, like the prevailing wind of a particular day, can also have an effect on the direction. In February and March the breeze is not as strong, because the ocean temperature is a bit warmer. Other months have a weak or non-existent Fremantle Doctor. It's only very occasionally that the sea breeze circulation raises temperatures. In the winter months, the land temperature is usually cooler than the ocean temperature, and this sometimes results in the weaker land breeze in the early morning. The gradient wind in Perth yesterday was a northeasterly, which is not the best for generating a 'typical Fremantle Doctor'. This occasionally occurs in Sydney you can look offshore and see the smog out to sea , but is quite common in heavily industrialised cities such as Los Angeles and Athens. I guess the pollution could be considered a pseudo-tracer for the continental airmass. The sea breeze circulation displayed in Scott's picture is a very simplistic view of the circulation. By the early evening, the direction is from the south. Also keep in mind that maximum temperatures generally occur around 3pm local time, so if the sea breeze was weak, then the normal diurnal heating pattern could well overwhelm any cooling effect of the sea breeze.
Video about sea breeze perth:
Gabriele porta e Seabreeze kitesurf school
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