Solar flare activity on UT day 16-Apr is expected to be at the R0 level. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be light. An increase in the solar wind speed is expected from late 17-Apr due to a coronal hole wind stream. G0 geomagnetic conditions are expected for 16-Apr. An increase in geomagnetic activity is expected from late 17-Apr associated with the coronal hole wind stream. HF radio propagation conditions are expected to be fair to normal. Maximum Usable Frequencies (MUFs) in the Australian region are expected to be 15% depressed to near predicted monthly values.