ZCZC MIAPNSNHC ALL
TTAA00 KNHC DDHHMM

Public Information Statement
NWS National Hurricane Center Miami FL
915 AM EDT Mon Apr 25 2022

To:      Subscribers:
         -NOAA Weather Wire Service
         -Emergency Managers Weather Information Network
         -NOAAPort
         Other NWS Partners and NWS Employees
 
From:    Darren Wright, Acting Chief
         Marine, Tropical and Tsunami Services Branch
 
Subject: Tropical Cyclone Watch/Warning Product (TCV)
         Collaboration Testing April 25-29, 2022
 
The National Weather Service's (NWS), National Hurricane Center 
(NHC), Weather Prediction Center (WPC), Ocean Prediction Center 
(OPC), and Weather Forecast Offices (WFOs) in the NWS Eastern and 
Southern Regions will proceed with internal software and hardware 
testing of the National Tropical Cyclone Watch/Warning (TCV) product 
collaboration process April 25-28, 2022.  Test activities are 
expected to be conducted each day between 1600 UTC and 1900 UTC.  
Friday, April 29, 2022 is a designated backup day.  
 
The National TCV product contains a summary of collaborated wind 
and/or storm surge watches and warnings, depicted by NWS-defined 
geographic zones.  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 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 unintentionally 
appear on weather.gov Point and Click forecast pages temporarily 
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 as needed. 
 
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/ 
 
NNNN