958  
NOUS42 KILM 081123  
PNSILM  
NCZ087-096-099-105>110-SCZ017-023-024-032-033-039-054>056-058-059-  
082330-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE WILMINGTON NC  
723 AM EDT THU APR 8 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 APRIL 22, 2021)  
 
THE NWS WEATHER FORECAST OFFICE (WFO) IN WILMINGTON, NC AND WFOS IN  
THE NWS EASTERN AND IN THE SOUTHERN 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 1100 AM (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 130 PM (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  
 

 
 
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