NOAA’s National Weather Service announced today that starting June 1, there will be a change in the definition of hurricane and tropical storm watches and warnings. The advisories will now be allowed to be issued or remain in effect after a tropical system becomes post-tropical. A post-tropical cyclone is defined as a closed area of low pressure that has lost tropical characteristics but may continue to produce heavy rain / wind and may pose a significant threat to life and property. The changes are motivated by Hurricane Sandy.
“Our forecasters now have more flexibility to effectively communicate the threat posed by transitioning tropical systems,” said Louis W. Uccellini, Ph.D., director of NOAA’s National Weather Service. “Sandy’s forecast was remarkably accurate and under a similar situation in the future, forecasters will be able to choose the best option to
underscore the urgency involved”.
“I would like to thank everyone for their open and candid feedback on this proposal,” said Rick Knabb, Ph.D., director of NOAA’s National Hurricane Center. “Keeping communities safe when a storm threatens is truly a team effort and this change reflects that collaboration”.
Here is the official announcement from NOAA which includes a link to the changes in the advisory definitions and an example of what an advisory will look like after June 1: Official Announcement