Issued Sunday 11th June 2017 for Monday and Tuesday. Severe Weather Alert for HEAVY RAIN, FLASH FLOODING & STRONG WINDS on the South East Coast district of Queensland and Northern Rivers district of New South Wales. 48 hr rainfall totals of 100 to 200mm possible along the coast from the Sunshine Coast South to Ballina leading to flash flooding. Some river flooding also possible. Strong South to Gale Force South East winds of 50 to 70km hr with gusts to 90km hr possible along the coast and elevated terrain. Subscribe here for detailed HSC rain and storm maps!
An upper level cold cored cut off low is forecast to move East into SEQLD & NENSW during Monday and Tuesday generating instability. A surface low pressure system is forecast to begin developing off the SEQLD coast on Monday while intensifying and moving closer to the coast on Tuesday. The system is expected to weaken during Wednesday.
CURRENT FORECAST Sunday night: Scattered showers and rain areas with locally moderate falls continuing on the Gold Coast and Northern Rivers during Sunday night.
Monday: Scattered showers and rain areas on the Northern Rivers of NSW during the morning before developing further North on the SEQLD Coast during the afternoon. Rain increasing across both districts during Monday night with moderate to locally heavy falls possible between Brisbane and Ballina.
Above image: Low pressure and winds on Tuesday 13th June 2017 via BSCH
Tuesday: Scattered showers and rain areas with moderate to locally heavy falls during the morning between the Sunshine Coast and Ballina extending to adjacent inland areas. South East winds increasing from Strong to Gale Force along the SEQLD and NENSW coasts with gusts to 90km hr possible. Rain increasing during the afternoon and overnight Tuesday with heavy falls likely across the South East Coast QLD and Northern Rivers NSW .
Wednesday: The systems weaken with onshore winds producing scattered showers on the SEQLD coast and rain areas with moderate falls possible on the Northern Rivers of NSW.
NOTES: Any positional shift with the low will greatly influence exactly where the heaviest rainfall occurs. At this stage it is most likely from and including Brisbane south to Ballina including the Gold Coast and adjacent hinterland. Rainfall will be most heaviest along the coastal fringe and hinterland tapering off further inland along the the Great Dividing Range. Some areas of flash flooding are likely, some river rises are likely where the heaviest rain falls in catchments. River heights are not expected to exceed minor to moderate levels unless high rainfall greatly focuses over one area. Rough swell and dangerous surf conditions may develop along the coast due to strong winds.