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The virtually black clouds associated with the storm over Darlinghurst. Black nor'easters are generally cut-off low systems that simultaneously interact with moisture-laden coastal troughs, which pull in humid tropical airflow (i.e. atmospheric river) from the north, whereby the cold upper air cools down the warmer, saturated air, forcing a lot of moisture to fall as rain.
An east coast low on 27 July 2020 taken by Himawari 8. Australian east coast lows (known locally as east coast lows, maritime lows, and east coast cyclones [1]) are extratropical cyclones or low-pressure systems on the coast of southeastern Australia that may be caused by both mid-latitude and tropical influences over a variety of levels in the atmosphere.
The rain bomb was caused by a tropical moisture (or an atmospheric river) that arrived from northern Australia which interacted with a low pressure trough on the New South Wales coast and later became an east coast low. Global warming and the consequential ocean heating was a contributing factor to this event. [24]
According to the Bureau of Meteorology, in an event described as "volatile, dangerous and dynamic", the heavy rainfall event was caused by a blocking high in the Tasman Sea (between Tasmania and New Zealand) that directed a strong, low pressure trough towards the NSW coast. [13]
A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area. Since low pressure implies a low height on a pressure surface, troughs and ridges refer to features in an identical sense as those on a topographic map. Troughs may be at the surface, or aloft, at ...
When the Australian continent heats up much rapid than the surrounding ocean (the Timor, Banda Sea, and Arafura Sea), low pressure systems may form, which efficaciously draw in the monsoon trough (which is an area of low pressure and rising air) above the hot and dry areas of northern Australia, thereby increasing humidity prior to the rains ...
[105] [106] [107] The heavy rain was caused by remnants of ex-tropical Cyclone Olga and humid north-easterly winds feeding into the low pressure trough. [108] [109] In 2011, Sydney recorded its wettest July since 1950. The CBD recorded 244 mm (9.61 in) of rain that month. 2011 was also the wettest year since records began in 1858. [110]
This is assumed by specialists now to relate to low salinity water leading to Fresh Water Skin Disease. Necroscopys and water testing were not carried out. In March 2021, a record breaking low pressure trough brought intense rainfall to the Manning Valley catchment area, [12] inundating properties at Taree and Wingham. It peaked at 5.7 m (19 ft ...
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