On UT day 23-Mar solar activity in expected to be R0-R1. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be moderate to high due to a CME arrival expected at 23/1100UT +/- 12 hours and an ongoing influence from a coronal hole wind stream. Geomagnetic conditions are expected to be initially G0, with G1-G2 geomagnetic conditions expected for the second half of the UT day. HF radio propagation conditions are expected to be initially normal becoming fair to poor for the second half of the UT day. Maximum usable frequencies in the Australian region are expected to be initially near predicted values to 15% enhanced with depressed conditions possible by the end of the UT day.