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Public Information Statement
National Weather Service Columbia SC
945 AM EDT Thu Apr 25 2024

To:        Subscribers:
           -NOAA Weather Wire Service
           -Emergency Managers Weather Information Network
           -NOAAPort
           Other NWS Partners and NWS Employees

From:      Greg Schoor, Chief
           Marine, Tropical and Tsunami Services Branch

Subject:   Hurricane Threats and Impacts (HTI) Mosaic Testing on
           April 25, 2024

Weather Forecast Offices (WFOs) in the Southern and Eastern Regions
will commence with Hurricane Threats and Impacts (HTI) threat grid
mosaic testing on Thursday, April 25. 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.

For the test, HTI grids will be created for hurricane Wind Threat,
Storm Surge Threat, Flooding Rain Threat, and Tornado Threat 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 the tropical cyclone. These webpages use the
following URL format, where wfo should be replaced with the 3
digit identifier for the WFO of interest:

NWS Eastern Region WFOs: https://www.weather.gov/wfo/tropical#hti

NWS Southern Region WFOs:
https://www.weather.gov/srh/tropical?office=wfo#hti

More 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 2024.

For more information, please contact:
Frank Alsheimer
Science and Operations Officer
National Weather Service West Columbia, SC
frank.alsheimer@noaa.gov

National Public Information Statements are online at:
https://www.weather.gov/notification/

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