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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
241 PM EDT WED APR 7 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:   HURRICANE THREATS AND IMPACTS (HTI) MOSAIC TESTING ON 
           APRIL 8, 2021 (BACKUP DATE: APRIL 22, 2021)

THE NWS WEATHER FORECAST OFFICE (WFO) IN NEW YORK AND WFOS IN NWS
EASTERN REGION WILL COMMENCE WITH HURRICANE THREATS AND IMPACTS 
(HTI) THREAT GRID MOSAIC TESTING ON THURSDAY, APRIL 8. THURSDAY, 
APRIL 22 HAS BEEN DESIGNATED AS THE BACKUP TEST DATE IN THE EVENT 
THAT TESTING CANNOT BE CONDUCTED ON APRIL 8. 

TESTING WILL BEGIN AT APPROXIMATELY 1500 UTC. TEST ACTIVITIES 
WILL TAKE APPROXIMATELY 1 HOUR; HOWEVER, NWS DISSEMINATION SYSTEMS
MAY TAKE UP TO AN HOUR AND A HALF TO PURGE ALL TEST DATA. ALL 
TEST DATA IS EXPECTED TO BE CLEARED BY 1730 UTC. 

FOR THE TEST, HTI GRIDS WILL BE CREATED FOR HURRICANE WIND 
THREAT, HURRICANE STORM SURGE THREAT, HURRICANE FLOODING RAIN 
THREAT, AND HURRICANE TORNADO THREAT. THESE GRIDS ARE SENT TO THE 
NATIONAL DIGITAL FORECAST DATABASE (NDFD) AND CAN BE SEEN ON THE 
NDFD WEB VIEWER AT: HTTPS://DIGITAL.WEATHER.GOV 

THE PRODUCT DESCRIPTION DOCUMENT FOR THESE THREAT GRIDS CAN BE 
FOUND HERE: HTTPS://WWW.WEATHER.GOV/MEDIA/SRH/TROPICAL/PDD_HTI.PDF

HTI GRIDS ARE CREATED BY WFOS FOR THEIR COUNTY WARNING AREA AND 
MOSAICKED TOGETHER TO FORM A MORE GEOGRAPHICALLY CONSISTENT 
DEPICTION OF THE THREAT POSED BY HURRICANE HAZARDS. THE HTI 
MOSAICS CAN BE FOUND IN KML FORMAT AT: HTTPS://WEATHER.GOV/HTI 

WHEN POPULATED HTI GRIDS ARE POSTED, THEY ALSO CAN BE FOUND ON 
THE WFO TROPICAL WEB PORTAL PAGE LINKED BELOW UNDER THE THREATS 
AND IMPACTS TAB: HTTPS://WWW.WEATHER.GOV/SRH/TROPICAL

PERIODIC SOFTWARE AND HARDWARE TESTING IN PREPARATION FOR 
TROPICAL CYCLONE EVENTS WILL CONTINUE DURING THE REMAINDER OF 
2021. 

FOR MORE INFORMATION, PLEASE CONTACT:

  NELSON VAZ
  WARNING COORDINATION METEOROLOGIST    
  NATIONAL WEATHER SERVICE OFFICE NEW YORK, NY
  UPTON NY  11973 
  NELSON.VAZ@NOAA.GOV
  631-924-0593 

  DAVID WALLY 
  TROPICAL TEAM LEADER   
  NATIONAL WEATHER SERVICE OFFICE NEW YORK, NY
  UPTON NY 11973 
  DAVID.WALLY@NOAA.GOV

NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT: 
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/ 

$$

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