Public Information Statement
Issued by NWS Melbourne, FL

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NOUS42 KMLB 071903

Public Information Statement
National Weather Service Melbourne FL
303 PM EDT Wed Apr 7 2021

To:     Subscribers:
     -NOAA Weather Wire Service
     -Emergency Managers Weather Information Network
     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:

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 also can 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:

 Matthew Volkmer
 Science and Operations Officer
 National Weather Service Office
 Melbourne, FL 32935

National Public Information Statements are online at:


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