ZCZC MIAPNSNHC ALL TTAA00 KNHC DDHHMM Public Information Statement NWS National Hurricane Center Miami FL 800 AM EDT Tue Jul 13 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 July 13-14, 2021 The NWS National Hurricane Center (NHC), Weather Prediction Center (WPC), Ocean Prediction Center (OPC), and Weather Forecast Offices (WFOs) in Brownsville, TX (BRO), Caribou, ME (CAR), Gray, ME (GYX), New Orleans, LA (LIX), and San Juan, PR (SJU) will commence with internal software and hardware testing of the National Tropical Cyclone Watch/Warning (TCV) product collaboration process July 13-14, 2021. Test activities are expected to be conducted between 1600 UTC and 1900 UTC. Thursday, July 15, 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 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. 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/ NNNN