Solar activity on UT day 14-Dec is expected to be at the R0 level. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be strong due a coronal hole wind stream. G0 geomagnetic conditions are expected. HF radio propagation conditions are expected to be fair to normal. Maximum usable frequencies (MUFs) in the Australian region are expected to be initially 15-20% depressed then recovering to near predicted monthly values.