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PUBLIC INFORMATION STATEMENT...UPDATED
NATIONAL WEATHER SERVICE CARIBOU ME
324 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 (BACKUP DATE: APRIL 22, 2021)

THE NWS WEATHER FORECAST OFFICE (WFO) IN HONOLULU AND WFOS IN THE
NWS SOUTHERN REGION AND IN THE NWS EASTERN REGION 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 (1100 AM EDT). 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
(130 PM EDT). 

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 ALSO CAN 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:

  LOUISE FODE
  WARNING COORDINATION METEOROLOGIST    
  NATIONAL WEATHER SERVICE OFFICE
  CARIBOU, ME 04736
  LOUISE.FODE@NOAA.GOV
  207-492-0180 X223

  TODD FOISY
  SCIENCE AND OPERATIONS OFFICER    
  NATIONAL WEATHER SERVICE OFFICE
  CARIBOU, ME 04736
  TODD.FOISY@NOAA.GOV
  207-492-0180 X224

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

$$

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