NOUS41 KWBC 131540 AAA



Service Change Notice 17-69 Updated

National Ocean Service Silver Spring MD

Relayed by the National Weather Service

1140 AM EDT Tue June 13 2017


To:      Subscribers:

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS and NOS Partners and NOAA Employees


From:    Edward Myers

         Chief, Coastal Marine Modeling Branch

         Coast Survey Development Laboratory

         NOS/Office of Coast Survey


Subject: Updated: Addition of new NWS Storm Surge Watches and

         Warnings and changes to symbology used to display NWS

         Tropical Cyclone Advisory Forecast Tracks, Cone of

         Uncertainty, and Coastal Tropical Cyclone Watches/

         Warnings on NOAA's nowCOAST effective on or about

         June 19, 2017


Updated effective date to  of on or about June 19, 2017


Effective on or about June 19, 2017, NOAA's nowCOAST

(trademarked) ( will incorporate the

new NWS Storm Surge Watch and Warning with other NWS Watches,

Warnings and Advisories for long duration events on nowCOAST map

service, wwa_meteoceanhydro_longduration_hazards_time. The

spatial resolution of the storm surge watch and warnings on

nowCOAST will be at the original 2.5 km (1.6 mi) resolution. 

The storm surge watch and warnings also will be available via

the nowCOAST map viewer.


The storm surge watch and warnings will be issued by NWS to

highlight areas along the Gulf and Atlantic coasts of the

continental United States that have a significant risk of life-

threatening coastal inundation from ongoing or potential

tropical, subtropical or post-tropical cyclone events. Detailed

information about the NWS Storm Surge Watches/Warnings can be

found at


In addition, the depiction of tropical cyclone forecast

information on maps available from the nowCOAST map service,

wwa_meteocean_tropicalcyclones_trackintensityfcsts_time, will

change effective on or about June 12, 2017. These changes were

made due in part to modifications in NHC GIS data services and

graphics depicting NHC's 2-Day and 5-day Graphical Tropical

Weather Outlook for Active Tropical Cyclones and to promote more

consistency with NHC products. Additional information about NHC

changes can be found at

Summary of changes:


-  The 5-day cone of uncertainty representing the uncertainty in

the probable forecast track of a tropical cyclone will be

depicted in semi-transparent white.


-  The forecast positions for remnants, post tropical, tropical

depression, tropical storms and hurricanes will be depicted with

new symbols and in black.


- The new symbol for hurricanes will contain the forecasted

Saffir-Simpson Hurricane Wind Scale Category (i.e., 1, 2, 3, 4

or 5).


-  The observed (best track) positions for tropical cyclones

will be depicted in white.


-  The forecast track for tropical cyclones will be depicted

with a dashed blue line. 


-  The tropical storm warnings along the immediate coastline

will be depicted with a solid blue line.



NOAA's nowCOAST provides coastal intelligence on present and

future environmental conditions for coastal and maritime users by

integrating data and information from across NOAA and other

federal and state agencies. nowCOAST was developed by

NOAA/National Ocean Service's Coast Survey Development

Laboratory, and is hosted on the Integrated Dissemination Program

(IDP) infrastructure where it is monitored 24x7 by

NWS/NCEP Central Operations.


For questions concerning nowCOAST, please contact:


John G.W. Kelley

NOS Co-Project Manager


Durham, NH



Nipa Parikh

NWS Co-Project Manager


Silver Spring, MD



For questions concerning NWS Storm Surge Watches and Warnings

please contact:




National Ocean Service Change Notices are online at: