Solar flare activity on UT day 26-May is expected to be at the R0 level, with a chance of R1. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be moderate over the UT day. G0 geomagnetic conditions are expected. HF radio propagation conditions are expected to be mostly normal across the Australian region. Maximum Usable Frequencies (MUFs) in the Australian region are expected to be near predicted monthly values.