Solar flare activity on UT day 17-Apr is expected to be at the R0 level. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be initially light, then increasing to moderate to strong late in the UT day due to a coronal hole high speed wind stream. Geomagnetic conditions are expected to be initially G0, then becoming G1 later in the UT day. There is a chance for G2 periods on 18-Apr. HF radio propagation conditions are expected to be mostly fair to normal, though may become more degraded later in the UT day for the southern Australian region. Maximum Usable Frequencies (MUFs) in the Australian region are expected to be 15% depressed to near predicted monthly values. Depressed HF conditions may be experienced on 18-Apr for the southern Australian region.