Issued 22nd June 2018. UPDATED 25th June 2018. After a long dry spell, inland parts of Central and Southern QLD and inland parts Northern and Central NSW could see their best rain in many months on Tuesday and Wednesday. SEQLD daily 24hr rainfall maps avialable via HSC Premium Forecasts.
Despite some other OUTRAGEOUS claims of 200mm in 24hrs, the highest rainfall totals of around 25mm over 2 days is more likely to eventuate through Southern inland QLD and Northern inland NSW. There is nothing “freaky” about that, it is just welcome and well needed rain.
Central and Southern inland QLD from Mackay to Longreach south are likely to see widespread falls of 10 to 25mm.
A majority of NSW is also likely to see widespread falls of 10 to 25mm. NSW daily 24hr rainfall maps avialable via HSC Premium Forecasts.
The trigger on Tuesday is an upper trough of cold air shifting East from Central Australia which will provide instability. A high pressure system in the Tasman Sea will direct a deep moist Northerly flow into the upper system which will generate showers, rain and and even some isolated storms.
On Wednesday the system moves East and peaks in intensity through Eastern QLD and Eastern NSW. On Thursday a bulk of the system moves offshore leaving some showers.
A second follow up system is now also forecast next week starting Sunday which at this stage could bring better falls than the first round across large parts of QLD and NSW.