Solar flare activity on UT day 15-Sep is expected to be at the R0 level. S0 solar radiation storm conditions, with a chance of S1 are expected. The solar wind is expected to be moderate, trending towards strong. G1 geomagnetic conditions are expected. HF radio propagation conditions may become mildly degraded upon the onset of geomagnetic activity. Maximum usable frequencies in the Australian region are expected to be near predicted values to depressed by up to 10%.