Nishizawa looks set to step down and would be the latest high-profile resignation in the wake of the Japanese insurance industry's Bigmotor and price-fixing scandals.
Plan promises a proactive approach to disaster risk reduction including improved early warning systems and reviews of building codes and insurance levy arrangements.
The cyclone is set to reintensify, after previously causing extensive rainfall in the NT, and is part of a series of weather challenges facing Australia.
