East coast low brings heavy rainfalls to NSW north coast

June 16, 2017
The main feature of the weather charts the last few days was the development of an East Coast low pressure off the NSW coastline.

Heavy rains were recorded north from Batemans Bay right up to Coolangatta. Sydney recorded 161 mms in the 72 hours to last Saturday morning 10th June, already well above the June average of 120 mms. Much heavier falls occurred further north along the coastal fringe. Evans Head received 300 mms and Lismore 166 mms.

Sydney's rainfall profiles this year including the wetter than average June is similar to 1843, 1890, 1956, 1958 and 1976 and from these five episodes, there was significant heavy rains in our regions from late winter right through the spring season.

At present dry conditions will persist for a few weeks, yet, due to the the extensive high pressure belt from well west of WA to east of Tasmania. With the East Coast low sitting in the North Tasman Sea, this does constitute a blocking pattern which does look set to continue the next week or 10 days before any active frontal passages bringing rainfall, can arrive in our regions.

Further heavy rain is expected along the NSW Coast up to next weekend, 17-18th June . Sea surface temperatures in the Tasman Sea continue to be well above normal, this being the catalyst for further heavy rain as the East Coast Low remains quasi stationary. Some of this rain will reach just west of the ranges, but falls will be light.

Widespread fogs dominated the last few days but daytime maxima were a couple of degrees above the June normal at many places. 
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