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NOUS41 KWBC 311445

Service Change Notice 16-35
National Ocean Service Office of Coast Survey Silver Spring MD
Relayed by the National Weather Service
1045 AM EDT Wed Aug 31, 2016

To:  Subscribers:
  -NOAA Weather Wire Service
  -Emergency Managers Weather Information Network
  Other NWS and NOS Partners and NOAA Employees

From:  Edward Myers
  Acting Chief, Coastal Marine Modeling Branch
  Coast Survey Development Laboratory
  NOS/Office of Coast Survey

Subject:  Addition of a map service to NOAAs nowCOAST(tm) to
  provide access to NWS/National Hurricane Center`s
  Potential Storm Surge Flooding Map Effective
  September 14, 2016

Effective Wednesday, September 14, 2016, the NOAA nowCOAST(tm)
( will provide access to the NWS/National
Hurricane Center Potential Storm Surge Flooding Map via web
mapping services. nowCOAST will provide users access to the
Potential Storm Surge Flooding Map using two different
protocols: ArcGIS Representational State Transfer (REST) Map
Service and OGC Web Map Service (WMS).This service will allow
NOAA users to integrate this map with their own map layers such
as coastal evacuation routes and critical infrastructure on
client- or server-based Geographic Information Systems or other
mapping applications. In addition, users will also be able to
view the NHC map via the nowCOAST map viewer.

The Potential Storm Surge Flooding Map was developed by the NHC
over the course of several years in consultation with social
scientists, emergency managers, broadcast meteorologists, and
others. The map is intended to depict the risk associated with
coastal flooding from storm surge associated with tropical
cyclones.  On June 1, 2016 it became an operational product,
issued on demand for certain tropical cyclones that are expected
to affect the Atlantic or Gulf Coasts of the United States.

The nowCOAST map service will provide access to the latest
official NWS Potential Storm Surge Flooding Map which depicts
the geographical areas where inundation from storm surge could
occur along with the heights, above ground, that water could
reach in those areas. These potential heights are represented
with different colors based on water level:

Greater than 1 foot above ground (blue)
Greater than 3 feet above ground (yellow)
Greater than 6 feet above ground (orange)
Greater than 9 feet above ground (red)

Two versions of this graphic are provided in this map--one with
a mask (depicted in gray) identifying Intertidal Zone/Estuarine
Wetland areas and another version without the Intertidal
Zone/Estuarine Wetland mask.  Two additional layers are provided
to depict first, the full geographic extent for which the map is
presently valid (the "map boundary"), and second, Levee Areas,
if any, within the affected area (symbolized with a black-and-
white diagonal hatch pattern). If the map is not presently
active, all layers will be blank except for the Map Boundary
layer, which will display a gray shaded region indicating the
coverage area for any potential future graphics along with a
text label indicating that the map is not presently available.

The nowCOAST map service will be updated approximately every
10 minutes to ensure the latest information is provided to the
user as soon as it becomes available. Once issued, the Potential
Storm Surge Flooding Map will be updated by NHC every 6 hours
alongside each new NHC Forecast Advisory for the associated
tropical cyclone. Due to processing requirements, however,
during the creation of this product, the map will be available
approximately 60 to 90 minutes following the release of the
associated Forecast Advisory, at which point nowCOAST will
acquire it and update this map service within the next 10 to
20 minutes (i.e., this product will be updated on nowCOAST
within approximately 70 to 110 minutes after the associated
forecast advisory is released).

Beginning September 14, this new nowCOAST map service can be
found at
Additional information about NHCs Potential Storm Surge
Flooding Map can be found at

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 NOS
Coast Survey Development Laboratory, and is hosted on NOAAs
Integrated Dissemination Program (IDP) infrastructure where it
is monitored 24 x 7 by NWS/NCEP Central Operations.

For questions concerning this new map service, please contact:

John G.W. Kelley
NOS Co-Project Manager
Silver Spring, MD

Nipa Parikh
NWS Co-Project Manager
Silver Spring, MD

For questions concerning the NHC Potential Storm Surge Flooding
Map, please contact:

Jamie Rhome
Storm Surge Specialist and Team Lead
NWS/NCEP/NHC Storm Surge Unit
Miami, FL

For information about NOAA/IDP, please contact:

Michelle M. Mainelli
NOAA Integrated Dissemination Program Manager
NWS Office of Dissemination
Silver Spring, MD

National Service Change Notices are online at: is the U.S. government's official web portal to all federal, state and local government web resources and services.