362
NOUS41 KWBC 222000
PNSWSH
PUBLIC INFORMATION STATEMENT 25-27
NATIONAL WEATHER SERVICE HEADQUARTERS SILVER SPRING MD
400 PM EDT TUE APR 22 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 (BACKUP DATE: APRIL 29, 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.
IN THE EVENT THAT THE COMMENCEMENT DATE IS DECLARED A CRITICAL
WEATHER
DAY (CWD), AN ENHANCED CAUTION EVENT, OR OTHER EVENT IS OCCURRING OR
IS
ANTICIPATED TO OCCUR, THE TESTING WILL COMMENCE AT THE AFFECTED
OFFICES
ON APRIL 29, 2025.
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:
JESSICA SCHAUER
NWS TROPICAL SERVICES PROGRAM MANAGER
MARINE, TROPICAL, AND TSUNAMI SERVICES BRANCH
MIAMI, FL
TROPICAL.PROGRAM@NOAA.GOV
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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