For the last several days, the NOGAPS model has been predicting that a tropical storm would form over the warm Indian Ocean waters off the SW coast of Sumatra. It hasn't happened yet, however.
It such a tropical cyclone does develop over the next few days, it would be very unusual, however, since the storm would spiral off merrily into the Southern Hemisphere, which is the winter hemisphere right now. Tropical cyclones almost never occur in the winter hemisphere! So, it would be a truly strange event!