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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
246 PM CDT 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.
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 2026.
FOR MORE INFORMATION, PLEASE CONTACT:
CHRIS BUONANNO
SCIENCE AND OPERATIONS OFFICER
NATIONAL WEATHER SERVICE OFFICE
NORTH LITTLE ROCK AR
CHRISTOPHER.BUONANNO@NOAA.GOV
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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