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NOUS41 KGYX 072020
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MEZ007>009-012>014-018>028-033-NHZ001>015-300919-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
417 PM EDT WED APR 7 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

THE NWS WEATHER FORECAST OFFICE (WFO) IN GRAY/PORTLAND, ME AND
WFOS IN NWS EASTERN REGION, NWS SOUTHERN REGION, AND WFO HONOLULU
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 1500 UTC. TEST ACTIVITIES WILL 
TAKE APPROXIMATELY ONE 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,
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.

WHEN POPULATED HTI GRIDS ARE POSTED, THEY CAN ALSO BE FOUND ON THE
WFO TROPICAL WEB PORTAL PAGE LINKED BELOW UNDER THE "THREATS AND
IMPACTS" TAB: HTTPS://WWW.WEATHER.GOV/SRH/TROPICAL.

PERIODIC SOFTWARE AND HARDWARE TESTING IN PREPARATION FOR TROPICAL
CYCLONE EVENTS WILL CONTINUE DURING THE REMAINDER OF 2021.

FOR MORE INFORMATION, PLEASE CONTACT:

DONALD DUMONT
WARNING COORDINATION METEOROLOGIST
NATIONAL WEATHER SERVICE OFFICE
1 WEATHER LANE
GRAY, ME 04039
DONALD.DUMONT@NOAA.GOV
207-688-3221

NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION

$$

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