Public Information Statement
National Weather Service Little Rock AR
820 PM CDT 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
2020.

For more information, please contact:

Chris Buonanno
Science and Operations Officer
National Weather Service Office
North Little Rock AR 72118
christopher.buonanno@noaa.gov

501-834-9102

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

NNNN

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