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Public Information Statement
Issued by NWS Key West, FL
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Public Information Statement
National Weather Service Key West FL
539 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 (Backup date: April 22, 2021)

The NWS Weather Forecast Office (WFO) in Honolulu and WFOs in the
NWS Southern Region and in the NWS Eastern 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 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, 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

When populated HTI grids are posted, they also can be found on
the WFO Tropical Web Portal page linked below under the Threats
and Impacts tab:
https://www.weather.gov/srh/tropical

Periodic software and hardware testing in preparation for
tropical cyclone events will continue during the remainder of
2021.

For more information, please contact:

 Chip Kasper
 Meteorologist-in-Charge
 National Weather Service Office
 Key West, FL 33040
 kennard.kasper@noaa.gov
 305-295-1316

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

$$
National Weather Service National Headquarters
