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NOUS41 KWBC 271450

Service Change Notice 17-23
National Weather Service Headquarters Washington DC
1050 AM EST Mon Feb 27 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: Expansion of the tropical cyclone watch/warning
 information available in the National Tropical Cyclone
 Watch/Warning (TCV) products issued for Atlantic
 tropical cyclones effective on or around June 1, 2017

Effective on or around June 1, 2017, the National Hurricane
Center (NHC) will expand the tropical cyclone watch and warning
information available in its National Tropical Cyclone
Watch/Warning (TCVAT#) products issued for Atlantic tropical
cyclones. In past hurricane seasons, the National TCV products
for the Atlantic basin contained only the tropical cyclone wind
watches and warnings along coastal segments issued by NHC.
Beginning in the 2017 hurricane season, the national TCV
products from NHC for the Atlantic basin will include all
NWS-issued zone-based tropical cyclone wind and storm surge
watches and warnings from both NHC and local Weather Forecast
Offices (WFOs) and will no longer contain breakpoint
information. Information about the new NWS storm surge
watch/warning can be found in Service Change Notice 17-16:

The process to compile the complete set of coastal and inland
watches and warnings will result in a modest delay in the
availability of the NHC-issued National TCV, which is expected
to be available within 15 minutes of the nominal advisory time
for routine advisories. In some circumstances, such as for the
issuance of special advisories, it may be delayed as much as
45 minutes after the advisory time.  Public Information
Statements from NHC (PNSNHC) and social media may be used to
communicate significant issuance delays for any NHC products.

The national TCV for the Atlantic Basin will contain Universal
Geographic Code (UGC) and the following Valid Time Event Codes

TR.A - Tropical Storm Watch
TR.W - Tropical Storm Warning
HU.A - Hurricane Watch
HU.W - Hurricane Warning
SS.A - Storm Surge Watch
SS.W - Storm Surge Warning

Examples of the National TCV product for the Atlantic Basin can
be found on the NHC website:

Additional information on UGC and VTEC can be found in NWS
Instruction (NWSI) 10-1701 and NWSI 10-1703, respectively at:

These changes to the NHC-issued national TCV do not apply to the
Pacific Basin.National TCV products issued for the Pacific
basin from NHC (TCVEP#) and the Central Pacific Hurricane Center
(TCVCP#) will continue to use only coastal segment or island
VTEC, as appropriate, at this time.

For more information, please contact:

Jessica Schauer
NWS Marine, Tropical and Tsunami Services Branch
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: is the U.S. government's official web portal to all federal, state and local government web resources and services.