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Public Information Statement National Weather Service State College 
PA 939 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 

National Weather Service (NWS)  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:   Jonathan Guseman  Warning 
Coordination Meteorologist  National Weather Service Office  State 
College, PA  jonathan.guseman@noaa.gov

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

$$