NOAA released a description of some changes to the suite of products put out by the National Hurricane Center which will become effective in the upcoming Atlantic tropical season.  The updates include storm surge watches and warnings and some enhancements in watches and warnings for storms that have not yet reached official storm status.  You can read about all the changes at https://www.nhc.noaa.gov/news/20170309_pa_2017SeasonChanges.pdf.