Localised heavy downpour Sydney City 3 and 4 April 2016

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Similar to a recent rain event that affected portions of Wollongong, overnight 3 and 4 April 2016, portions of Sydney experienced a downpour that was not expected. Sydney is prone to local downpours resulting in some suburbs receiving significant falls whereas suburbs just a few kilometres away receive little rainfall.

The same occurred during the stated period. In this regard, the weather station at Observatory Hill (Sydney) recorded 94.4 mm of rain for the 24 hours to 9 am 4/4/2016 with much of this falling between 10.30 pm and 5.30 am including 50 mm between 10.30 pm and 11.30 pm.

This is unusual because nearby weather station rain gauges recorded much less although a station at Little Bay recorded 81 mm and Bondi had 50 mm. A rain gauge at Sydney Airport received just 17 mm showing the localised nature of the event.

Suburbs just 10 km away received 15 to 23 mm and much of Sydney's west had 1 mm or less. The recordings at Sydney Observatory Hill shows the following:-

9.30 pm - 0.6 mm.
10 pm - 1.8 mm.
10.30 pm - 5.6 mm.
11.30 pm - 57 mm (50 mm in the hour).
12 midnight - 70.8 mm.
1 am - 83.4 mm.
5.30 am - 91.8 mm.
9 am - 94.4 mm.

The attached rainfall plot from the “Water and the Land” for Sydney to 9 am 4/4/2016 “Bureau of Meteorology” shows the localised nature of this event. While Sydney City and a few other localities were soaked, much of Sydney completely missed out on the event.

Heavy overnight downpour Wollongong – 26 and 27 March 2016

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Overnight Saturday and into early Sunday 26 and 27 March, a portion of Wollongong city on the Illawarra Coast south of Sydney experienced a downpour lasting at least 3 hours that produced as much as 177 mm of rain. At least 3 weather station rain gauges captured the event as follows:-

Rixons Pass - 177 mm.
Russell Vale Colliery - 174 mm.
Bellambi - 118 mm.

A rain gauge at nearby Balgownie recorded 62 mm of rain during the event.

This event would have impacted the suburbs of Corrimal, Russell Vale, Woonoona and possibly Bulli before the storm moved out to sea. Much of southern Wollongong had little or no rainfall which shows how localised the event was. A rain gauge at Bellambi shows the following:-

10 pm - 7.6 mm.
10.30 pm - 32.8 mm.
11 pm - 67 mm (This shows almost 60 mm of rain in 1 hour or 1 mm per minute).
12 midnight - 101 mm.
1 am - 117 mm.

This would have caused localised flash flooding within a confined area.

The rainfall plot for Wollongong taken from the "Water and the Land" Bureau of Meteorology and dated 9 am 27/3/2016 shows where the event occurred. It is difficult to identify due to its localised nature but it is an event that has been captured by three rain gauges within the local area.

Heavy coastal showers affect eastern Sydney – 21 and 22 March 2016

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Following a recent dry spell spanning at least 6 weeks, Sydney's eastern suburbs have been affected by some heavy rainfall from coastal showers. The falls have only impacted coastal suburbs to approximately 10 km inland. Further inland, rainfall totals taper away sharply.

For the 24 hours to 9 am 21/3/2016, the following rainfall figures have been recorded:-

Randwick - 95 mm.
Manly - 92 mm.
Cromer - 72 mm.
Mona Vale - 69 mm.
Bondi - 64 mm.
Little Bay - 63 mm.

For the 24 hours to 9 am 22/3/2016, the following rainfall figures have been recorded:-

Little Bay - 51 mm.
Randwick - 41 mm.

Accumulative totals:- It can be seen that Randwick has had 135 mm and Little Bay has had 114 mm for the 2 day period making it quite wet within a small region of Sydney. Such large totals have not occurred elsewhere but it does show the wide variation of rainfall that has occurred within a small area within Sydney.

The rainfall plot for Sydney for the 24 hours to 9 am 21/3/2016 is attached for reference taken from the Water and the Land “Bureau of Meteorology”.