Public Information Statement
Issued by NWS Atlanta, GA

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NOUS42 KFFC 071942

Public Information Statement
National Weather Service Peachtree City GA
342 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

For more information, please contact:

Sid King
Tropical Program Manager
National Weather Service Office
Peachtree City, GA, 30269
770-486-1133 (press 4)

National Public Information Statements are online at:

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