On UT day 31-Mar solar flare activity is expected to be R1-R2. The solar wind speed is expected to be moderate to very strong in the later half of the UT day. G3, chance G4 geomagnetic conditions are expected due to the arrival of a CME, at approximately 31/1600UT +/- 10 hours. HF radio propagation conditions are expected to be normal to fair, as ionospheric disturbances begin following the arrival of the CME. Maximum usable frequencies in the Australian region are expected to be near predicted values. S0 solar radiation storm conditions are expected. Aurorae may be visible in the Southern Australian region tonight, during local night hours.