Public Information Statement
Issued by NWS Boston, MA

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870 NOUS41 KBOX 071835 PNSBOX CTZ002>004-MAZ002>024-026-RIZ001>008-081800- Public Information Statement National Weather Service Boston/Norton MA 235 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 Boston/Norton, MA 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 (11 AM EDT). 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 (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: The Product Description Document for these threat grids can be found here: 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: 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: Periodic software and hardware testing in preparation for tropical cyclone events will continue during the remainder of 2021. For more information, please contact: Andy Nash Meteorologist-In-Charge National Weather Service Office 46 Commerce Way Norton, MA 02766 508-622-3250 National Public Information Statements are online at: $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.