NOUS41 KWBC 131340



Service Change Notice 18-40

National Weather Service Headquarters Silver Spring, MD

940 AM EDT Fri Apr 13 2018


To:         Subscribers:

            -NOAA Weather Wire Service

            -Emergency Managers Weather Information Network


            Other NWS Partners and NWS Employees


From:       Allison Allen

            Chief, Marine, Tropical and Tsunami Services Branch


Subject:    The Tropical Cyclone Marine Danger Graphic from the

            CPHC will match the NHC Danger Graphic effective

            on or about June 1, 2018


Effective on or about June 1, 2018, the Central Pacific

Hurricane Center (CPHC) will issue a Tropical Cyclone Marine

Danger Graphic for the central Pacific Basin in the same format

used by the Tropical Analysis and Forecast Branch (TAFB) of the

National Hurricane Center (NHC). 


TAFB provides a Tropical Cyclone Marine Danger graphic based on

the 34-kt wind speed probabilities. The graphic goes through 

72 hours from the latest active tropical cyclone advisory using

the 5 percent and 50 percent 34-kt wind speed probability

contours for both the Atlantic and East Pacific basins. 


When there are no active tropical cyclones in the central

Pacific basin, the graphic will be blank with the following



     There is no tropical cyclone activity in the central  



These tropical cyclone danger area graphics will be available 

4 times daily at 0400, 1000, 1600, and 2200 Universal

Coordinated Time (UTC) on the CPHC website at:


A comprehensive description of the Tropical Cyclone Marine

Danger Area graphic is posted at:


For additional information contact:


Jessica Schauer

NWS Tropical Service Program Lead

NWS Marine, Tropical and Tsunami Services Branch

Miami, FL



National Service Change Notices are online at: