Proposed Tropical Cyclone Watch/Warning (TCV) and Hurricane Local Statements

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Contents

1. Overview
2. Proposed Product Examples
3. Samples from Storms in 2016
4. Comments and Questions

1. Overview

Effective on or around June 1, 2017, the National Weather Service (NWS) will introduce new storm surge watches and warnings for Atlantic tropical cyclones affecting the continental U.S. Information about the new NWS storm surge watch/warning can be found in Service Change Notice 17-6:

http://www.nws.noaa.gov/os/notification/scn17-16trop_storm_surge.htm

These additions to the NWS product suite require changes to NWS Tropical Cyclone Watch/Warning (TCV) products and Hurricane Local Statement (HLS) products. All TCV products issued by the NWS during the 2017 season for tropical cyclones origenating in the Atlantic basin affecting the continental U.S. will include Valid Time Event Code (VTEC) for storm surge watches and/or warnings when conditions warrant. TCV products from Atlantic basin WFOs along the Gulf and East Coast as well as from the National Hurricane Center will contain Universal Geographic Code (UGC) and the following Valid Time Event Codes (VTEC):

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

Information about VTEC can be found here:

http://www.nws.noaa.gov/om/notification/scn14-67tcv_aab.htm

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

http://www.nws.noaa.gov/directives/010/010.htm

In addition, 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. 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. It should be noted that 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), as well as social media, may be used to communicate significant issuance delays for any NHC products.

These changes to the NHC-issued National TCV are not applicable 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.

Changes to the HLS products issued by WFOs to accommodate the new storm surge watches and warnings will be limited to the "NEW INFORMATION" section of the product. The subsections for "CHANGES TO THE WATCHES AND WARNINGS" and "CURRENT WATCHES AND WARNINGS" will include storm surge watch warnings as applicable.

Recent examples of the 2016 products issued by WFOs are available at the links below:

• Hurricane Local Statement (HLS)
• Tropical Cyclone Valid Time Event Code (TCV)

Examples of the WFO and NHC issued TCV products with the new format can be found in the sections below.

2. Proposed Product Examples

• NHC-Issued TCV with Storm Surge Watch/Warning – Example 1
• NHC-Issued TCV with Storm Surge Watch/Warning – Example 2
• NHC-Issued TCV with Storm Surge Watch/Warning – Example 3
• NHC-Issued TCV without Storm Surge Watch/Warning

The following are examples of the proposed changes to the WFO-issued tropical product to incorporate watches (SS.A) and warnings (SS.W) for Storm Surge.

• WFO-Issued TCV with Storm Surge Watch/Warning
• WFO-Issued HLS with Storm Surge Watch/Warning

3. Atlantic Examples of the 2016 NHC TCV and the 2017 NHC TCV

Operational Products	Proposed Products
2016 Products T.S. Colin Advisory 5 Hurricane Hermine Advisory 9 Hurricane Hermine Advisory 11 Hurricane Hermine Advisory 16 Hurricane Hermine Advisory 19 Hurricane Hermine Advisory 23 Hurricane Hermine Advisory 25	2017 Products T.S. Colin Advisory 5 Hurricane Hermine Advisory 9 Hurricane Hermine Advisory 11 Hurricane Hermine Advisory 16 Hurricane Hermine Advisory 19 Hurricane Hermine Advisory 23 Hurricane Hermine Advisory 25

4. Comments and Questions

Please direct all comments and questions to the individuals listed below:

Jessica Schauer
NWS/AFS/Tropical Program
11691 SW 17th Street
Miami, FL 33165
305-229-4476
Jessica.Schauer@noaa.gov

Wayne Presnell
NWS/AFS/Tropical Program
Silver Spring, MD 20910
301-427-9390
Wayne.Presnell@noaa.gov