439  
NOUS41 KOKX 071841  
PNSOKX  
CTZ005>012-NJZ002-004-006-103>108-NYZ067>075-078>081-176>179-  
081730-  
 
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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