Solar activity on UT day 16-May is expected to be at R1-R2 levels. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be moderate to light. G0 geomagnetic conditions are expected. 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 to 15% depressed. Shortwave fadeouts are probable.