Public Information Statement
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Public Information Statement
National Weather Service Tallahassee FL
930 AM EDT Thu Apr 25 2024 /830 AM CDT 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 11, 2024 (Backup date: April 25, 2024)

The National Weather Service (NWS) Weather Forecast Offices
(WFOs) in Honolulu, San Juan, San Diego, and Los Angeles along
with WFOs in the NWS Southern Region west of the Mississippi
River will commence with Hurricane Threats and Impacts (HTI)
threat grid mosaic testing on Thursday, April 11. A second test
that will include WFOs east of the Mississippi River is planned
for 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 Southern and Western Region (San Diego and Los Angeles) WFOs:
https://www.weather.gov/srh/tropical?office=wfo#hti

WFO Honolulu:
https://www.weather.gov/hfo/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:

  Felecia Bowser
  Meteorologist in Charge
  National Weather Service Office
  Tallahassee, FL 32306
  Felecia.Bowser@noaa.gov
  850-942-8833

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

NNNN

$$


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