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NOUS41 KPHI 202115
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PAZ054-055-210915-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
515 PM EDT MON APR 20 2026
TO: SUBSCRIBERS:
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS AND NWS EMPLOYEES
FROM: JAMIE RHOME, DEPUTY DIRECTOR
NATIONAL HURRICANE CENTER
SUBJECT: HURRICANE THREATS AND IMPACTS (HTI) MOSAIC TESTING ON
APRIL 21, 2026 (BACKUP DATE: APRIL 23, 2026)
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 TUESDAY, APRIL 21, 2026.
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 TEST NEEDS TO BE POSTPONED, DUE TO WEATHER
OR ANOTHER EVENT, THE TESTING WILL INSTEAD COMMENCE AT THE
AFFECTED OFFICES ON APRIL 23, 2026.
FOR THE TEST, HTI GRIDS WILL BE CREATED FOR TROPICAL 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.
HTTPS://WWW.WEATHER.GOV/ERH/GHWO?WFO=PHI
HTTPS://WWW.WEATHER.GOV/PHI/TROPICAL#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
2026.
FOR MORE INFORMATION, PLEASE CONTACT:
SARAH JOHNSON
WARNING COORDINATION METEOROLOGIST
NATIONAL WEATHER SERVICE OFFICE
MOUNT HOLLY, NJ
SARAH.JOHNSON@NOAA.GOV
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
MJL
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