560  
NOUS41 KPHI 240838  
PNSPHI  
DEZ001>004-MDZ012-015-019-020-NJZ001-007>010-012>027-PAZ054-055-  
060>062-070-071-101>106-242045-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ  
438 AM EDT THU APR 24 2025  
 
TO: SUBSCRIBERS:  
-NOAA WEATHER WIRE SERVICE  
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK  
-NOAAPORT  
OTHER NWS PARTNERS AND NWS EMPLOYEES  
 
FROM: GREG SCHOOR, CHIEF  
MARINE, TROPICAL AND TSUNAMI SERVICES BRANCH  
 
SUBJECT: HURRICANE THREATS AND IMPACTS (HTI) MOSAIC TESTING ON  
APRIL 24, 2025  
 
THE NATIONAL WEATHER SERVICE (NWS) WEATHER FORECAST OFFICES  
(WFOS) IN HONOLULU, HAWAII, SAN JUAN, PUERTO RICO, AND ALL WFOS  
IN THE CONTIGUOUS UNITED STATES THAT CAN ISSUE TROPICAL STORM AND  
HURRICANE HAZARDS WILL COMMENCE WITH HURRICANE THREATS AND  
IMPACTS (HTI) THREAT GRID MOSAIC TESTING ON THURSDAY, APRIL 24,  
2025. 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, FLOODING RAIN THREAT, TORNADO THREAT, AND STORM SURGE  
THREAT (WHERE APPLICABLE) AT EACH PARTICIPATING WFO. THOSE GRIDS  
ARE STITCHED TOGETHER INTO STORM-SCALE HTI GRAPHICS. THE HTI  
MOSAIC GRAPHICS ARE AVAILABLE IN KEYHOLE MARKUP LANGUAGE (KML)  
FORMAT ON THE FOLLOWING WEBPAGE:  
HTTPS://WWW.WEATHER.GOV/HTI  
 
THE MOSAICS ARE ALSO AVAILABLE THROUGH THE NATIONAL DIGITAL  
FORECAST DATABASE AND ON WEB PAGES HOSTED BY THE WEATHER FORECAST  
OFFICES (WFOS) AFFECTED BY TROPICAL CYCLONES. THESE WEBPAGES  
INCLUDE WFO TROPICAL WEBPAGES AND GRAPHICAL HAZARDOUS WEATHER  
OUTLOOK (GHWO) WEBPAGES.  
 
GHWO WEBPAGES USE THE FOLLOWING URL FORMAT, WHERE "XXX" SHOULD BE  
REPLACED WITH THE 3-LETTER IDENTIFIER FOR THE WFO OF INTEREST  
(NOTE THAT WFO HONOLULU DOES NOT HAVE A GHWO WEBPAGE):  
HTTPS://WWW.WEATHER.GOV/ERH/GHWO?WFO=XXX  
 
WFO 3-LETTER IDENTIFIERS AND THE RESPECTIVE NWS REGION THAT EACH  
WFO BELONGS TO IS LISTED AT THE FOLLOWING PAGE:  
HTTPS://WWW.WEATHER.GOV/PIMAR/CWABYWFO  
 
NWS EASTERN, SOUTHERN, AND WESTERN REGION WFO TROPICAL WEBPAGES  
USE THE FOLLOWING URL FORMAT, WHERE "XXX" SHOULD BE REPLACED WITH  
THE 3 LETTER IDENTIFIER FOR THE WFO OF INTEREST:  
 
NWS EASTERN REGION WFOS:  
HTTPS://WWW.WEATHER.GOV/XXX/TROPICAL#HTI  
 
NWS SOUTHERN REGION AND WESTERN REGION WFOS:  
HTTPS://WWW.WEATHER.GOV/SRH/TROPICAL?OFFICE=XXX#HTI  
 
THE TROPICAL WEBPAGE FOR WFO HONOLULU CAN BE FOUND AT:  
HTTPS://WWW.WEATHER.GOV/HFO/HTI  
 
USER INFORMATION ABOUT HTI CAN BE FOUND HERE:  
HTTPS://WWW.WEATHER.GOV/MEDIA/SRH/TROPICAL/HTI_EXPLANATION.PDF  
 
MORE SPECIFIC DETAILS ON HTI CAN BE FOUND IN THE PRODUCT  
DESCRIPTION DOCUMENT:  
HTTPS://WWW.WEATHER.GOV/MEDIA/SRH/TROPICAL/PDD_HTI.PDF  
 
PERIODIC SOFTWARE AND HARDWARE TESTING IN PREPARATION FOR  
TROPICAL CYCLONE EVENTS WILL CONTINUE DURING THE REMAINDER OF  
2025.  
 
FOR MORE INFORMATION, PLEASE CONTACT:  
 
SARAH JOHNSON  
WARNING COORDINATION METEOROLOGIST  
NATIONAL WEATHER SERVICE OFFICE  
MOUNT HOLLY, NJ 08060  
SARAH.JOHNSON@NOAA.GOV  
 
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:  
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/  
 

 
 
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