NOUS41 KWBC 081330



Public Information Statement 17-10

National Weather Service Headquarters Silver Spring MD

130 PM EST Wed Mar 8 2017



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:   Soliciting comments through April 9, 2017, on   

           proposed changes to the suite of graphics and   

           Geographical Information System (GIS) files 

           accompanying Tropical Cyclone Advisory packages


NWS is soliciting comments through April 9, 2017, on proposed

changes to the appearance of graphics accompanying tropical

cyclone advisory packages issued by the National Hurricane

Center (NHC) and Central Pacific Hurricane Center (CPHC). These

changes would be necessary for the NHC and CPHC to begin issuing

forecasts and watches/warnings for potential tropical cyclones

as proposed in Public Information Statement 17-04:


A potential tropical cyclone is a disturbance that is not yet a

tropical cyclone, but one for which the NWS proposes to begin

issuing tropical cyclone watches or warnings because it poses

the threat of bringing tropical storm or hurricane conditions to

land areas within 48 hours.


In addition, NWS is proposing three new Keyhole Markup Language

(KML) files and will issue higher resolution wind speed

probability GIS files. This resolution change will make the data

smoother when plotted but will not change how it is plotted or

interpreted or affect a user's ability to display the data.


If comments are favorable, the NWS will implement the changes at

or around the start of the 2017 hurricane season. NWS will issue

a Service Change Notice before implementing this change.


Summary of changes:


-  All tropical cyclone graphics would use a common map

background and color scheme.


-  The estimated extent of tropical-storm-force and hurricane-

force winds at advisory time would be depicted on the 5-day and

3-day track forecast/uncertainty graphic with the following


   --Orange, estimated extent of tropical-storm-force winds

   --Brown, estimated extent of hurricane-force winds 


Note that users would have the option to toggle the initial wind

extents overlay on and off.


-  The estimated extent of 34-kt, 50-kt, and 64-kt winds at

advisory time, as well as the forecast extent of 34-kt, 50-kt,

and 64-kt winds, would be available in shapefile and KML format. 

In addition, the estimated cumulative wind swath of hurricane-

force and tropical-storm-force winds would be available in KML

and shapefile format. Previously, these files were only

available in shapefile format.


-  The 5-day probability of 34-kt, 50-kt and 64-kt winds in KML

and shapefile format would be available on a 5 km grid. 

Previously, these files used 10 km grid spacing. The resolution

of the model used to generate the input data has not change. 


-  The static Uniform Resource Locators (URL) of the latest-

available graphics from NHC for a given tropical cyclone would

change. A complete list of proposed URL changes for NHC products

is on the NHC website at the following URL:


CPHC products are provided on dynamic URLs that change for each

tropical cyclone. The graphics for active tropical cyclones can

be found on the CPHC webpage:


Send comments or requests for more information to:


Jessica Schauer

NWS Marine, Tropical and Tsunami Services Branch

National Hurricane Center

Miami, FL 33165

Telephone: 305-229-4476



Wayne Presnell

NWS Marine, Tropical and Tsunami Services Branch

Silver Spring, MD  20910

Telephone: 301-427-9390



National Service Change Notices are online at: