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Public Information Statement
NWS National Hurricane Center Miami FL
250 PM EDT Wed Jun 2 2021

To:        Subscribers:
           -NOAA Weather Wire Service
           -Emergency Managers Weather Information Network
           -NOAAPort
           Other NWS Partners and NWS Employees
 
From:      Allison Allen, Chief 
           Marine, Tropical and Tsunami Services Branch
        
Subject:   Tropical Cyclone Watch Warning Product (TCV) 
           Collaboration Testing Thursday, June 3 2021
 
The NWS National Hurricane Center (NHC) and Weather Forecast Offices 
(WFOs) in Miami, Florida and Boston/Norton, Massachusetts will 
commence with internal software and hardware testing of the National 
Tropical Cyclone Watch/Warning (TCV) product collaboration process 
on Thursday, June 3, 2021.  Test activities are expected to be 
conducted between 1200 UTC and 1500 UTC.  Friday, June 4, 2021 is a 
designated backup day.   

Internal TCV test products are not intended to be released 
externally through NWS dissemination and communication systems.  The 
text products affected by collaboration testing are the National 
Tropical Cyclone Watch/Warning (TCV) products issued under the 
following AWIPS Product Identifiers (PIL) and World Meteorological 
Organization (WMO) Identifiers (ID):

TCV Product                    AWIPS PIL   WMO ID
------------                   ---------   -------
Preliminary TCV                PTCAT/1-5/  WTNT/81-85/ KNHC
National TCV                   TCVAT/1-5/  WTNT/81-85/ KNHC       

In addition, the following National Digital Forecast Database (NDFD) 
elements will be created for this test:
     - Tropical cyclone wind probabilities (incremental and 
          cumulative) for 34 kt, 50 kt, and 64 kt
     - Hazard grid (including tropical storm, hurricane, and 
          storm surge hazards)  

While unlikely, there is a slight chance that the tropical 
expressions of uncertainty (i.e., "Tropical Storm Conditions 
Likely", "Hurricane Conditions Possible") could temporarily appear 
on weather.gov Point and Click forecast pages unintentionally 
because this test includes the internal creation of tropical wind 
speed probabilities.

The NWS will continue periodic internal tropical software testing 
during the remainder of this hurricane season an needed.  The 
national TCV product contains a summary of collaborated wind and/or 
storm surge watches and warnings, depicted by NWS-defined geographic 
zones.

For more information, please contact:
 
  Michael J. Brennan
  Branch Chief, Hurricane Specialist Unit
  National Hurricane Center
  Michael.J.Brennan@noaa.gov
  305-229-4436
	 
National Public Information Statements are online at:
 
  https://www.weather.gov/notification/ 

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