Solar activity on UT day 15-Sep is expected to be R0 with a chance of R1. S0 solar radiation storm conditions are expected. The solar wind is expected to be moderate to strong. G1-G2 geomagnetic conditions are expected. HF radio propagation conditions are expected to be mostly normal to mildly degraded. Maximum usable frequencies in the Australian region are expected to be near predicted values. S0 solar radiation storm conditions are expected.