Solar activity on UT day 30-May is expected to be at R1-R2 levels. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be very strong. G1 geomagnetic conditions are expected, with a chance of G2 due to coronal hole high speed wind stream effects. HF radio propagation conditions are expected to be normal to fair. Maximum usable frequencies (MUFs) in the Australian region are expected to be near predicted monthly values. Shortwave fadeouts are possible.