Public Information Statement
Issued by NWS Wilmington, NC

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000 NOUS42 KILM 081123 PNSILM NCZ087-096-099-105>110-SCZ017-023-024-032-033-039-054>056-058-059- 082330- PUBLIC INFORMATION STATEMENT National Weather Service Wilmington NC 723 AM EDT Thu Apr 8 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 April 22, 2021) The NWS Weather Forecast Office (WFO) in Wilmington, NC and WFOs in the NWS Eastern and in the Southern 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 1100 AM (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 130 PM (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 $$ 7

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