Solar activity on UT day 18-Aug is expected to be at the R0 level. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be light to moderate. G0-G1 geomagnetic conditions are expected due to coronal hole high speed wind stream effects. HF radio propagation conditions are expected to be mostly normal. Maximum usable frequencies (MUFs) in the Australian region are expected to be near predicted monthly values.